直流无刷电机驱动器ATE33035(MC33035)使用说明

产品说明MC33035是高性能第二代单片无刷直流马达控制电路。

它包含实现开环、三相或四相马达控制所需的全部功能。

此电路包括转子位子检测器，温度补偿基准，锯齿波振荡器，三个集电极开路的高速驱动器，和三个高电流的图腾柱低速驱动器，适用于驱动功率MOSFET 管。

此控制器还包含一些有保护特点的电路，如欠电压锁定，时间延迟可选的周期接周期限流控制，内部过热保护电路和一个独特的故障输出，易于和微控制系统连接。

典型的马达控制功能包括开环速率，前进/后退方向，运行使能和动态制动。

MC33035是专门为电气相位为60°/300°或120°/240°的马达电路设计的，并能有效的控制无刷直流马达。

DIP-24SOP-24• 10 ~ 30 V 工作电压 • 欠电压锁定• 6.25 V 基准传感器工作电源 • 闭环伺服应用中的误差放大器• 高电流驱动，可控制外部三相MOSFET 电桥• 周期接周期限流控制 • 管脚输出的电流感应基准 • 内部过热保护电路• 60°/300°或120°/240°传感器相位可选 • 通过外部MOSFET 电桥可有效控制产品归类产品型号工作温度封装MC33035DW SOP–24 MC33035PTA =-40° to +85°CDIP-24管脚连接低速驱动输出传感器输入/PWN 输入°选择典型原理图此器件包含了285个有效的晶体管。

极限参数参数符号范围单位电源电压VCC 40 V数字输入(管脚3, 4, 5, 6, 22, 23) – VrefV 振荡器输入电流（源电流或陷电流）IOSC 30 mA 误差放大器输入电压范围(管脚 11, 12，注1)VIR –0.3 ~ Vref V误差放大器输出电流（源电流或陷电流，注2）IOut 10 mA 电流检测输入电压（管脚9，15）VSense –0.3~5.0V故障输出电压VCE(Fault) 20 V故障输出陷电流ISink(Fault) 20 mA高速驱动电压(管脚1, 2, 24) VCE(top) 40 V高速驱动陷电流(管脚1, 2, 24) ISink(top) 50 mA低速驱动工作电压(管脚 18) VC 30V 低速驱动输出电流（源电流或陷电流，管脚19, 20, 21）IDRV 100 mA 功率消耗和热特性DIP-24最大功耗@ TA = 85°C 过热电阻，结对空SOP-24最大功耗@ TA = 85°C 热敏电阻，结对空电阻PDRθJAPDRθJA86775650100mW°C/WmW°C/W工作结温TJ 150°C环境温度TA –40 ~ +85 °C贮存温度Tstg –65~+150°C电气特性(除非特别制定，否则VCC = VC = 20 V, RT = 4.7 k, CT = 10 nF, TA = 25°C)参数符号最小值典型值最大值单位基准部分基准输出电压(Iref = 1.0 mA) TA = 25°CTA = –40°~ +85°C Vref5.95.826.24–6.56.57V线路调整(VCC = 10~30 V, Iref = 1.0mA)Regline -- 1.5 30 mV负载调整(Iref = 1.0~20 mA) Regload -- 16 30 mV输出短路电流(注 3) ISC 40 75 – mA基准欠电压锁定阈值 Vth4.04.55.0V误差放大器输入偏移电压(TA = –40° ~ +85°C) VIO -- 0.4 10 mV输入偏移电流(TA = –40°∼+85°C) IIO -- 8.0 500 nA输入偏置电流(TA = –40° ~ +85°C) IIB -- -46 -1000 nA输入共模电压VICR (0 V ~ Vref) V开环电压增益(VO = 3.0 V, RL = 15 k) AVOL 70 80 -- dB输入共模抑制比 CMRR5586--dB 电源抑制比(VCC = VC = 10 to 30 V) PSRR 65 105 -- dB输出电压摆浮高电平状态(RL = 15 k to Gnd) 低电平状态(RL = 15 k to Vref)VOHVOL4.6–5.30.5–1.0V振荡单元振荡频率 fOSC222528kHz 频率随电压改变(VCC = 10~30 V) ∆fOSC/∆V – 0.01 5.0 %锯齿波峰值电压 VOSC(P)–4.14.5V锯齿波谷值电压 VOSC(V)1.21.5–V逻辑输入输入阈值电压(管脚3, 4, 5, 6, 7, 22, 23)高电平状态低电平状态VIHVIL3.0--2.21.7--0.8V传感器输入(管脚4, 5, 6)高电平输入电流(VIH = 5.0 V) 低电平输入电流(VIL = 0 V)IIHIIL-150-600-70-337-20-150µA前进/后退，60°/120°可选(管脚3, 22, 23)高电平输入电流(VIH = 5.0 V) IIHIIL-75-300-36-175-10-75µA低电平输入电流(VIL = 0 V)输出使能高电平状态输入电流(VIH = 5.0 V) 低电平状态输入电流VIL =0V IIHIIL-60-60-29-29-10-10µA限流比较仪阈值电压 Vth85101115mV 输入共模电压 VICR--3.0--V输入偏置电流 IIB---0.9-5.0µA输出和电源单元高速驱动输出饱和陷电压(Isink = 25 mA) -- 0.51.5 V高速驱动输出关闭状态漏电流(VCE = 30 V) -- 0.06100 µA高速驱动输出转换时间(CL = 47 pF, RL = 1.0 k)上升时间下降时间trtf––10726300300ns低速驱动输出电压高电平状态(VCC = 20 V, VC = 30 V, Isource = 50 mA)低电平状态(VCC =20V, VC = 30V, Isink = 50 mA) VOHVOL(VCC-2.0)--(VCC-1.1)1.5--2.0V故障输出饱和陷电压(Isink = 16 mA) VCE(sat) -- 225 500 mV 故障输出关闭状态漏电流(VCE = 20 V)IFLT(leak) -- 1.0 100 µA欠电压锁定驱动输出允许 (VCC 或VC 增加)滞后Vth(on)VH8.20.18.90.2100.3V电源电流管脚17 (VCC = VC = 20 V)管脚17 ( VCC = 20 V, VC = 30 V) 管脚18 ( VCC = VC = 20 V)管脚18 (VCC = 20 V, VC = 30 V) ICCIC--------12143.55.01620 06.010mA注： 1.输入共模电压或输入信号电压不能低于-0.3V。

开 发 应 用基于ＭＣ３３０３５的无刷直流电机控制器何进进（贵州大学电气工程学院，贵州 贵阳 ５５０００３） 摘 要：本文介绍了美国Ｍｏｔｏｒｏｌａ公司的第２代无刷直流电机控制器专用芯片ＭＣ３３０３５的基本原理，设计了一种以专用控 制芯片ＭＣ３３０３５、ＭＣ３３０３９为核心构成的无刷直流电机控制器。

关键词：ＭＣ３３０３５；无刷直流电机；控制 Brushless DC Motor Control Based on MC33035 Chip HE Jin-jin (College of Electrical Engineering,Guizhou University,Guizhou 550003,China) Abstract:The basic theory of MC33035 chip are introduced in the paper.A brushless DC motor control using the MC33035 and MC33039 is introduced in the paper. Key words:MC33035;Brushless DC motor;Control１前言 直流无刷电机自６０年代诞生以来，其既具备交流电机运行可靠、结构简单和维护方便的优点，又具有直流电机 的运行效率高、无励磁损耗以及调速性能好等许多优点， 同时还克服了直流机由于机械换相和电刷而带来的一系列 弊端，因而在国民经济的各个领域中它得到越来越广泛的 应用。

同时，随着现代控制理论、电力电子技术等学科领 域的飞速发展，直流无刷电机的驱动及控制技术作为电气 传动领域的一个分支，也在其特定的领域显示出强大的生 命力。

ＭＣ３３０３５是Ｍｏｔｏｒｏｌａ公司的第二代直流无刷电机控制 器专用芯片，而ＭＣ３３０３９是Ｍｏｔｏｒｏｌａ公司生产的直流无刷电 机控制器闭环速度控制专用芯片。

基于这两种芯片设计的 无刷直流电机控制器所需的外围电路简单，可靠性高，稳 定性好等优点［１－２］。

前言本款产品适合驱动持续工作电流在10A以下、额定电压范围在12V～40V之间的任何一款三相直流无刷霍尔电机。

具有免维护、长寿命、低速下总能保持最大转矩等优势。

本产品广泛应用于针织设备、医疗设备、食品机械、电动工具、园林机械、智能家居等电气自动化控制领域。

本手册阐述了该驱动器的的功能、安装、调试、维护、运行等方面的内容。

使用产品前，请认真阅读本手册并熟知本产品的安全注意事项。

在使用本款产品时，若有疑问，请仔细查阅产品说明书或致电我公司售后服务部，我们将竭诚为您服务。

安全注意事项警示标志：危险：表示该操作错误可能危及人身安全！注意：表示该操作错误可能导致设备损坏！注意事项：安装：防止灰尘、腐蚀性气体、导电物体、液体及易燃物侵入，并保持良好的散热条件。

接线：请由专业人员仔细阅读完使用说明之后进行接线作业；接线必须在电源断开的状态下进行，防止电击。

通电前：接通电源前检查并保证接线的准确无误；请确认输入电源与驱动器的额定工作电压及极性是否一致；通电中：驱动器接通电源后，请勿直接接触输出端子，有的端子上有高电压，非常危险；请确保在驱动器指示灯熄灭后再对驱动器的接线端子进行插拔；请勿对驱动器随意进行耐高压与绝缘性能试验；请勿将电磁接触器、电磁开关接到输出回路。

目录前言 (1)安全注意事项 (2)目录 (3)一．概述 (5)1．型号说明 (5)2．功能参数 (5)3．功能特点 (6)二．端口说明 (7)1．接口定义 (7)2．接线示意图 (8)3．安装尺寸 (9)三．功能与使用 (10)1．出厂说明 (10)2．操作步骤说明 (10)2.1外置电位器调速 (11)2.2外部电压调速 (11)2.3外部PWM信号调速 (11)2.4CAN总线控制 (11)3．功能端子说明 (12)3.1F/R端子：正反转功能 (12)3.2EN端子：使能功能 (12)3.3BRK端子：刹车抱死功能 (12)3.4SV端子：外部调速端子 (13)3.5PG端子：电机转速信号输出 (13)3.6ALM端子：报警输出 (13)3.7PWR/ALM：指示灯 (14)一．概述本款驱动器适用于对直流无刷有霍尔电机进行转速控制，其最大的优点是在低速时总能控制电机保持最大转矩。

基于MC33035的无刷直流电机驱动控制系统设计摘要随着社会的发展和人民的生活水平提高，人们对交通工具的需求也在不断发展和提高。

电动自行车作为一种“绿色产品”已经在全国各省市悄然兴起，进入千家万户，成为人们，特别是中老年人和女士们理想的交通工具，受到广大使用者的喜爱。

MC33035的典型控制功能包括PWM开环速度控制、使能控制(起动或停止) 、正反转控制和能耗制动控制。

此芯片具有过流保护、欠压保护、欠流保护、又因此芯片低成本、高智能化、从而简化系统构成、降低系统成本、增强系统性能、满足更多应用场合的需要。

设计的直流无刷电机控制器是采用 MC33035 芯片控制的，以本次设计结果表明，MC33035的典型控制功能带有可选时间延迟锁存关断模式的逐周限流特性以及内部热关断等特性。

电动自行车作为一种新型交通工具已经在社会上引起很大的影响并受到广大使用者的喜爱。

关键词：电动自行车，无刷直流电机，MC33035，位置传感器THE BRUSHLESS DC MOTOR DRIVE SYSTEM DESIGNBASED ON MC33035 CHIPABSTRACTWith the rapid development of technology, new energy technologies in recent years have been widely used. For example, the small size, light weight, high efficiency, low noise, large capacity and high reliability features such as permanent magnet brushless DC motor-driven bike.MC33035 Typical control functions include open loop PWM speed control so that it can control (start or stop), reversing control and braking control. This chip is overcurrent protection, undervoltage protection, under current protection, and therefore chip cost, high intelligence, which simplifies the system structure, lower system costs, increase system performance to meet the needs of more applications.The design of the brushless DC motor controller is controlled by MC33035 chip to this design results show that, MC33035 typical time delay control with an optional latch-by-week shutdown mode current limiting characteristics, and internal thermal shutdown characteristics. Electric bicycles as a mode of transportation has caused a great impact on society and loved by the majority of users.KEY WORDS: electric-bicycle, brushless DC motor, MC33035, position sensors目录前言 (1)第1章电动自行车简介 (2)1.1 电动自行车的发展 (2)1.1.1 电动自行车的发展前景 (2)1.1.2 电动自行车的未来 (2)1.2 电动自行车的结构 (3)1.3 电动自行车的动力分析 (5)第2章电动自行车无刷电机原理分析 (7)2.1 电动自行车无刷直流电动机的发展 (7)2.2 无刷直流电机（BLDCM）的基本结构与工作原理 (7)2.2.1 无刷直流电机的工作原理 (8)2.2.2 无刷直流电机的基本结构 (10)2.3 直流无刷电机的控制原理 (11)第3章电动自行车控制器单元电路分析 (13)3.1 电动自行车控制器的功能 (13)3.2 无刷电机控制器单元电路分析 (14)3.2.1 无刷直流电机调速原理 (14)3.2.2 速度调速器的结构 (15)3.2.3 速度把 (17)3.3 限速电路 (20)3.4 刹车电路 (21)3.5防飞车电路 (23)3.6 巡航电路 (24)第4章无刷直流电机MC33035芯片及其工作原理 (25)4.1 MC33035芯片介绍 (25)4.2 MC33035芯片内部功能 (27)4.3 MC33035芯片的内部结构及工作原理 (29)4.3.1 MC33035芯片的内部结构及特点 (29)4.3.2 MC33035芯片的工作原理 (31)第5章基于MC33035芯片的电动自行车控制器电路 (33)5.1电动自行车控制器的研究及发展 (33)5.2 基于MC33035芯片的无刷控制器电路 (35)5.2 三相六步电机控制电路 (37)5.3 有刷电机控制电路 (39)结论 (42)谢辞 (43)参考文献 (44)外文资料翻译 (46)前言当交通拥堵、空气污染日益成为困扰现代都市的老大难问题时，电动自行车作为一种环保、便捷、健康的绿色交通工具应运而生。

直流无刷电机工作原理与控制方法用A TE33035（替代MC33035）可以很方便的控制直流无刷电机。

直流无刷电机既具有交流电机的结构简单、运行可靠、维护方便等优点，又具备直流电机的运行效率高、无励磁损耗以及调速性能好等优点。

由于传统的直流电机均采用电刷以机械方法进行换向，因而存在相对的机械摩擦，由此带来了噪声、火化、无线电干扰以及寿命短等缺点。

随着电力电子工业的飞速发展，许多高性能半导体功率器件，如GTR、MOSFET、IGBT、IPM 等相继出现，以及高性能永磁材料的问世，均为直流无刷电机的广泛应用奠定了坚实的基础。

直流无刷永磁电机的基本组成：主要由电机本体、位置传感器和电子开关电路三部分组成。

其定子绕组一般制成多相（三相、四相、五相不等），转子由永久磁钢按一定极对数（p=2,4,…）组成。

图1. 三相两极直流无刷电机组成三相定子绕组分别连接到电子开关线路中相应的功率开关器件，A、B、C相绕组分别与功率开关管V1、V2、V3相接。

位置传感器跟踪与电机转子转轴相连接的部件。

此处采用光电器件作为位置传感器，以三只功率晶体管V1、V2和V3构成功率逻辑单元。

三只光电器件VP1、VP2和VP3的安装位置各相差120度，均匀分布在电动机一端。

借助安装在电机轴上的旋转遮光板的作用，使从光源射来的光线依次照射在各个光电器件上，并依照某一光电器件是否被照射到光线来判断转子磁极的位置。

常见的位置传感器有以下几种：电磁式位置传感器、光电式位置传感器、磁敏式位置接近传感器。

当定子绕组的某一相通电时，该电流与转子永久磁钢的磁极所产生的磁场相互作用而产生转矩，驱动转子旋转，再由位置传感器将转子磁钢位置变换成电信号，去控制电子开关线路，从而使定子各项绕组按一定次序导通，定子相电流随转子位置的变化而按一定的次序换相。

由于电子开关线路的导通次序是与转子转角同步的，因而起到了机械换向器的换向作用。

图2. 各相绕组的导通示意图三相永磁无刷直流电机转子位置传感器输出信号VP1、VP2、VP3在每360 电角度内给出了6个代码，按其顺序排列，6个代码是101、100、110、010、011、001。

无刷直流电机控制器MC33035的原理及应用无刷直流电机控制器MC33035的原理及应用摘要：MC33035是美国安森美公司开发的高性能第二代单元无刷直流电机控制器，它包含开环三相或四相电机控制所需的全部有效功能。

该器件由具有良好整流序列的转子位置译码器、可提供传感器功率的温度补偿参考、频率可编程的锯齿波振荡器、完全可访问的误差放大器以及三个非常适用于驱动大功率MOSFET的大电流推挽底部驱动器组成，因而是一种功能齐全的电机控制器。

文中介绍了MC33035的特点功能和工作原理，给出了由它组成的三相六步全波电机控制和H型电机有刷控制等两种电机控制电路。

关键词：无刷直流电机控制 MC330351 概述MC33035无刷直流电机控制器采用双极性模拟工艺制造，可在任何恶劣的工业环境条件下保证高品质和高稳定性。

该控制器内含可用于正确整流时序的转子位置译码器，以及可对传感器的温度进行补偿的参考电平，同时它还具有一个频率可编程的锯齿波振荡器、一个误差信号放大器、一个脉冲调制器比较器、三个集电极开路顶端驱动输出和三个非常适用于驱动功率场效应管（MOSFET）的大电流图腾柱式底部输出器。

此外，MC33035还有欠锁定功能，同时带有可选时间延迟锁存关断模式的逐周限流特性以及内部热关断等特性。

其典型的电机控制功能包括开环速度、正向或反向、以及运行使能等。

2 管脚排列及功能定义MC33035的管脚排列如图1所示，各引脚功能定义见表1。

表1 MC33035的管脚功能定义定管脚编号符号功能定义1，2，24 BT，AT，CT 三个集电极开路顶端驱动输出，用于驱动外部上端功率开关晶体管3 Fwd/Rev 正向/反向输入，用于改变电机转向4，5，6 SA,SB,SC 三个传感器输入，用于控制整流序列7 Ooutput Enable 输出使能，高电平有效。

该脚为高电平时，可使电机动8 Reference Output 此输出为振荡器定时电容CT提供充电电流，并为误差放大器提供参考电压，也可以向传感器提供电源表2 三相六步换向器真值表输入60度SA SB SC 120度SA SB SC 正向/反向使能电流检测顶部驱协AT BT CT 底部驱动AB BB CB1 0 0 1 0 0 1 1 01 1 0 1 1 0 1 1 01 1 1 0 1 0 1 1 00 1 1 0 1 1 1 1 00 0 1 0 0 1 1 1 00 0 0 1 0 1 1 1 01 0 0 1 0 0 0 1 01 1 0 1 1 0 0 1 01 1 1 0 1 0 0 1 00 1 1 0 1 1 0 1 00 0 1 0 0 1 0 1 00 0 0 1 0 1 0 1 01 0 1 1 1 1 X X X0 1 0 0 0 0 X X XV V V V V V X 0 X V V V V V V X 1 X 表中,V表示六个有效传感器或驱动组合中的一个，X表示无关；输入逻辑0定义为小于85mV，逻辑1为于115mV3 工作原理MC33035的内部结构框图如图2所示。

第一章无刷直流永磁电机的原理、特性1.1无刷直流永磁电机的工作原理在无刷直流永磁电动机（BLDCM）中，电枢绕组被设置在定子上，永磁体磁极设置在转子上，永磁体被设置在转子上。

定子各相电枢绕组相对转子永磁体磁场的位置，由转子位置传感器通过电子方式或电磁方式所感知；并利用其输出信号，通过电子换向电路，按照一定的逻辑程序去驱动与电枢绕组相连接的相应的功率开关管，把电流开关或换向到相应的电枢绕组。

随着转子的转动，转子的位置传感器不断地发出信号，致使电枢绕组不断地依次通电，不断地改变通电状态，从而使得在某一磁极下的线圈导体中流过的电流方向始终不变，这就是无刷直流永磁电机的无接触式电子换向过程的实质。

无刷直流永磁电机是在有刷直流电动机的基础上发展起来的。

无刷直流永磁电机和有刷直流电动机基本上具有相同的运行机理，但是在运行性能方面存在一定的差异：有刷直流电动机电枢绕组的元件数和换向器的换向片数多于无刷直流电动机电枢绕组的相数;在运行过程中，有刷直流电动机的磁极磁场与电枢磁场始终处于正交状态，而无刷直流电动机的磁极磁场与电枢磁场在某一角度位置范围内变动，正交状态只是其中一个瞬时位置。

因此，在其他条件相同的情况下，在运行过程中，无刷直流电动机的力矩脉动要大于有刷直流电动机的力矩脉动；无刷直流电动机的电磁力矩要小于有刷直流电动机的电磁力矩。

1.2电子换向在无刷直流永磁电动机中，来自转子位置传感器的信号，经处理后按照一定的逻辑程序，驱使某些与电枢绕组相连接的功率开关晶体管在某一瞬间到通或截止，迫使某些原来没有电流的电枢绕组开始流通电流，某些原来有电流的电枢绕组内开始关断电流或改变电流的流通方向，从而迫使电子磁状态的产生变化。

我们把这种利用电子电路来实现电枢绕组内电流变化的物理过程称为电子换向。

每换流一次，定子磁状态就改变一次，连续不断地换流，就会在工作气隙内产生一个跳跃式的旋转磁场。

在此情况下，永磁体磁场和电枢磁场之间的相互关系如图1.1所示。

1 MC33035功能介绍MC33035是安森美公司推出的第二代无刷直流电机控制专用集成电路，主要组成部分包括转子位置传感器译码电路、带温度补偿的内部基准电源、频率可设定的锯齿波振荡器、误差放大器、脉宽调制(PWM)比较器、输出驱动电路、欠压封锁保护、芯片过热保护等故障输出电路和限流电路等。

MC33035的典型控制功能包括PWM速度控制、使能控制(启动或停止)、正反转控制、相位选择和制动控制等。

芯片功能引脚定义如表1所列。

SA、SB、SC为霍尔信号输入端，内部上拉20 kΩ电阻，外接霍尔传感器即可。

Fwd／Rew、Brake、Output Enable和60°／120°Select分别为方向、制动、使能和霍尔相位控制端口，内部上拉40 kΩ电阻，MCU控制端只要通过光耦或者三极管开漏接地即可进行控制。

如果不采用IC内置的硬件速度环，则将PIN12、13短接，通过PIN11端口输入PWM即可对电机进行调节控制。

如果采用IC内置的硬件速度环则将PIN12、13通过R、C连接，通过PIN11端口输入PWM进行电机控制，HALL换向反馈信号通过PIN12端口输入。

2 基于MC33035的直流无刷电机控制驱动电路设计在本设计中主控制器以Freescale公司的基于PowerPC构架的32位处理器MPC5604P为例，MPC5604P控制端口通过比较器和MC33035接口，设计了基于MC33035直流无刷电机控制驱动电路。

传统的直流无刷电机控制驱动电路采用MPC5604P、预驱动IC和MOSFET 实现，其中包括电压泵即自举电路。

本设计是基于直流无刷电机控制芯片MC33035实现的，MC33035实现预驱动和电子自动换向功能，采用MC33035实现直流无刷电机的控制驱动电路，既简化了电路设计，同时也减轻了MPC5604P 的运算量。

MPC5604P和MC33035之间通过光耦或者比较器实现电平转换。

丹东奥拓电子有限公司 201505 ATE/QB 01.06-2015 共1页 第1页 技术交流
ATE33035（替代MC33035）的下部功率输出采用图腾柱电路结构
由于此结构画出的电路图有点儿像印第安人的图腾柱，所以叫图腾柱式输出。

就是上下各有一个晶体管，上管为NPN ，集电极c 接正电源，下管为PNP ，c 极接负电源，注意是负电源而不是地。

两管的b 极接到一起，接前级输入，上管和下管的e 接到一起，接驱动输出。

从直流角度看就是上下两个输出管是串联的，两管连接处分别为输入和输出端。

上管导通、下管截止输出高电平，下管导通、上管截止输出低电平。

如果上下两管均截止，电路逻辑可以视为高阻态。

在开关电源中，类似的电路常称为“半桥”。

该电路用来匹配电压，或者增加IO 口的驱动能力。

向上向下的推动和下拉力量很强，速度很快。

另一方面，当PWM 的输出端为低电平的时候，下管可以为MOS 的结电容提供放电回路。

图腾柱（Totem Pole ）输出电路。

MC33035是MOTOROLA公司第二代无刷直流电动机控制专用集成电路，外接功率开关器件和电子测速器MC33039，可构成闭环调速系统来控制三相（全波或半波）、两相或四相无刷直流电机。

它通过下侧半桥输出PWM对电机进行调速。

2MC33035的功能和组成2．1功能——可控制电机正反转；——实现电机刹车制动；——启停功能；——可选择三相无刷直流电机传感器相位差60°或120°；——欠压封锁保护，IC过热保护和故障输出。

2．2组成——转子位置传感器译码电路；——限流电路；——具有温度补偿的6.24V内部基准电源；——RT、CT可变锯齿波振荡电路；——脉宽调制比较器；——误差放大器；——输出驱动电路；——欠压、过热保护以及故障电平输出。

2．3引脚功能参见表1。

表 1 MC33035的引脚功能3MC33035的应用图1是MC33035与MC33039构成的闭环三相无刷直流电机控制电路图。

其电路各部分功能介绍：1）脚4、5、6是传感器位置信号输入，MC33035通过对输入位置信号译码对应输出驱动电机。

这三个信号与TTL电平兼容。

当输入全“0”或“1”表示非法信号。

故障输出端（引脚14）输出有效低电平。

通过选择引脚22来确定输入三相信号相位差为60°还是120°。

2）阻容RT、CT与内部振荡器产生锯齿波，作为PWM载波信号。

锯齿波幅值为1.5V～4.1V。

为防止噪声干扰，载波频率不宜过低，但频率太高容易使功率管过热，建议载波频率为20kHz～30kHz。

锯齿波是由引脚8输出6.24V参考电压经RT对CT充电，通过内部电路放电所产生。

由引脚11给定速度电压以及来自MC33039引脚5的速度方波信号经积分形成斩波信号与锯齿波形成PWM，参见图2，CT、误差输出PWM、内部锁存、上桥、下桥、错误信号对应时间关系如图3。

构成闭环的主要原理是当负载改变（如变大），则电机速度下降，测速器MC33039引脚5输出方波密度变低，此信号经积分形成斩波信号后幅值抬高，则使输出PWM占空比加大，输出电流增加，自然速度逐渐提高，以达到输出跟踪输入。

无刷直流电机控制器MC33035的原理及应用1. 简介无刷直流电机（BLDC）是现代电动机领域的重要组成部分，广泛应用于电动汽车、家用电器、工业自动化等领域。

无刷直流电机控制器MC33035是一款常用控制器之一，本文将介绍MC33035的工作原理及其应用。

2. MC33035的工作原理MC33035是一种三相直流无刷电机控制器，它采用了先进的空闲轴暂态电流控制的技术，能够实现高效的电机控制。

下面将详细介绍MC33035的工作原理。

2.1 相电流控制MC33035通过调节不同相的电流来控制电机的转速和转向。

它采用了一个电流环路和一个速度环路来实现精确的控制。

在电流环路中，MC33035通过PWM方式驱动功率MOSFET，调节电机相的电流大小和方向。

通过改变电流大小和相序，MC33035能够控制电机的转速和转向。

2.2 空闲轴暂态电流控制MC33035还采用了空闲轴暂态电流控制技术，通过改变暂态电流的大小和时序来提高电机的控制精度和效率。

在暂态电流控制过程中，MC33035会检测电机的转速和电流，并根据设定的参数进行调整，以实现最佳的控制效果。

3. MC33035的应用MC33035广泛应用于各种无刷直流电机控制系统中，具有以下特点和优势：3.1 高效性能MC33035采用了先进的控制算法和技术，能够实现高效的电机控制。

其空闲轴暂态电流控制技术可以显著提高电机的效率，减少能量损耗。

3.2 稳定可靠MC33035具有良好的稳定性和可靠性，能够在复杂的工作环境下稳定运行。

它能够自动检测和保护电机，防止过电流、过电压等故障发生。

3.3 灵活可编程MC33035具有丰富的控制参数和接口，可以根据不同的应用需求进行灵活配置。

用户可以通过编程来调整控制算法和参数，实现定制化的控制方案。

3.4 广泛应用MC33035广泛应用于电动汽车、电动工具、家用电器、工业自动化等领域。

它可以控制不同功率和转速范围的电机，满足各种应用需求。

MC33035, NCV33035 Brushless DCMotor ControllerThe MC33035 is a high performance second generation monolithic brushless DC motor controller containing all of the active functions required to implement a full featured open loop, three or four phase motor control system. This device consists of a rotor position decoder for proper commutation sequencing, temperature compensated reference capable of supplying sensor power, frequency programmable sawtooth oscillator, three open collector top drivers, and three high current totem pole bottom drivers ideally suited for driving power MOSFETs.Also included are protective features consisting of undervoltage lockout, cycle−by−cycle current limiting with a selectable time delayed latched shutdown mode, internal thermal shutdown, and a unique fault output that can be interfaced into microprocessor controlled systems.Typical motor control functions include open loop speed, forward or reverse direction, run enable, and dynamic braking. The MC33035 is designed to operate with electrical sensor phasings of 60°/300° or 120°/240°, and can also efficiently control brush DC motors. Features•10 to 30 V Operation•Undervoltage Lockout•6.25 V Reference Capable of Supplying Sensor Power•Fully Accessible Error Amplifier for Closed Loop Servo Applications•High Current Drivers Can Control External 3−Phase MOSFET Bridge•Cycle−By−Cycle Current Limiting•Pinned−Out Current Sense Reference•Internal Thermal Shutdown•Selectable 60°/300° or 120°/240° Sensor Phasings•Can Efficiently Control Brush DC Motors with External MOSFET H−Bridge•NCV Prefix for Automotive and Other Applications Requiring Site and Control Changes•Pb−Free Packages are Available241P SUFFIXPLASTIC PACKAGECASE 724DW SUFFIXPLASTIC PACKAGECASE 751E(SO−24L)See detailed ordering and shipping information in the package dimensions section on page 27 of this data sheet.ORDERING INFORMATIONSee general marking information in the device marking section on page 27 of this data sheet.DEVICE MARKING INFORMATIONRepresentative Schematic DiagramThis device contains 285 active transistors.1.The input common mode voltage or input signal voltage should not be allowed to go negative by more than 0.3 V.2.The compliance voltage must not exceed the range of −0.3 to V ref.3.NCV33035: T low = −40°C, T high = 125°C. Guaranteed by design. NCV prefix is for automotive and other applications requiring site and changecontrol.4.MC33035: T A = −40°C to +85°C; NCV33035: T A = −40°C to +125°C.5.Maximum package power dissipation limits must be observed.ERROR AMPLIFIER Output Voltage SwingHigh State (R L = 15 k to Gnd) Low State (R L = 15 k to V ref)V OHV OL4.6−5.30.5−1.0VV s a t , O U T P U T S A T U R A T I O N V O L T A G E (V )5.0 µs/DIVA V = +1.0No Load T A = 25°C, O U T P U T V O L T A G E (V )O 4.53.01.51.0 µs/DIVA V = +1.0No Load T A = 25°C3.053.02.95I O , OUTPUT LOAD CURRENT (mA)f, FREQUENCY (Hz)562202001801601401201008060−−16−08.0162432404840240A V O L , O P E N L O O P V O L T A G E G A I N (d B )E X C E S S P H A S E (D E G R E E S ),φT A , AMBIENT TEMPERATURE (°C)−55−4.0−2.02.01254.01007550250−25f O S C O S C I L L A T O R F R E Q U E N C Y C H A N G E (%),∆1001.0R T , TIMING RESISTOR (k Ω)100010010010f O S C O S C I L L A T O R F R E Q U E N C Y (k H z ),Figure 1. Oscillator Frequency versusTiming Resistor Figure 2. Oscillator Frequency Changeversus TemperatureFigure 3. Error Amp Open Loop Gain andPhase versus Frequency Figure 4. Error Amp Output SaturationVoltage versus Load CurrentFigure 5. Error Amp Small−SignalTransient Response Figure 6. Error Amp Large−SignalTransient Response1.02.00− 0.8−1.61.60.8 5.04.03.00V , O U T P U T V O L T A G E (V )O VI Sink , SINK CURRENT (mA)0−40−20−4020, N O R M A L I Z E D R E F E R E N C E V O L T A G E C H A N G E (m V )∆V r e f 0−−−−− 12− 16V r e f , R E F E R E N C E O U T P U T V O L T A G E C H A N G E (m V )∆Figure 11. Bottom Drive Response Time versusCurrent Sense Input Voltage Figure 12. Fault Output Saturationversus Sink Current0CURRENT SENSE INPUT VOLTAGE (NORMALIZED TO V th )50100150200250t H L , B O T T O M D R I V E R E S P O N S E T I M E (n s )1.0O U T P U T V O L T A G E (%)−40I O , OUTPUT LOAD CURRENT (mA)02.0806020, O U T P U T S A T U R A T I O N V O L T A G E (V )s a t V 50 ns/DIV V CC = 20 V V C = 20 V C L = 1.0 nF T A = 25°C100 ns/DIVV CC = 20 V V C = 20 V R L = 1.0 k C L = 15 pF T A = 25°CFigure 13. Top Drive Output SaturationVoltage versus Sink CurrentFigure 14. Top Drive Output WaveformFigure 15. Bottom Drive Output Waveform Figure 16. Bottom Drive Output WaveformI Sink , SINK CURRENT (mA)0.40.81.2V s a t , O U T P U T S A T U R A T I O N V O L T A G E (V )Figure 17. Bottom Drive Output SaturationVoltage versus Load Current 50 ns/DIVV CC = 20 V V C = 20 V C L = 15 pF T A= 25°CFigure 18. Power and Bottom Drive SupplyCurrent versus Supply Voltage, P O W E R S U P P L Y C U R R E N T (m A )C C , I 05.01015202530C I V CC , SUPPLY VOLTAGE (V)1000100100O U T P U T V O L T A G E (%)O U T P U T V O L T A G E (%)INTRODUCTIONThe MC33035 is one of a series of high performance monolithic DC brushless motor controllers produced by Motorola. It contains all of the functions required to implement a full−featured, open loop, three or four phase motor control system. In addition, the controller can be made to operate DC brush motors. Constructed with Bipolar Analog technology, it offers a high degree of performance and ruggedness in hostile industrial environments. The MC33035 contains a rotor position decoder for proper commutation sequencing, a temperature compensated reference capable of supplying a sensor power, a frequency programmable sawtooth oscillator, a fully accessible error amplifier, a pulse width modulator comparator, three open collector top drive outputs, and three high current totem pole bottom driver outputs ideally suited for driving power MOSFETs. Included in the MC33035 are protective features consisting of undervoltage lockout, cycle−by−cycle current limiting with a selectable time delayed latched shutdown mode, internal thermal shutdown, and a unique fault output that can easily be interfaced to a microprocessor controller. Typical motor control functions include open loop speed control, forward or reverse rotation, run enable, and dynamic braking. In addition, the MC33035 has a 60°/120°select pin which configures the rotor position decoder for either 60° or 120° sensor electrical phasing inputs. FUNCTIONAL DESCRIPTIONA representative internal block diagram is shown in Figure 19 with various applications shown in Figures 36, 38, 39, 43, 45, and 46. A discussion of the features and function of each of the internal blocks given below is referenced to Figures 19 and 36.Rotor Position DecoderAn internal rotor position decoder monitors the three sensor inputs (Pins 4, 5, 6) to provide the proper sequencing of the top and bottom drive outputs. The sensor inputs are designed to interface directly with open collector type Hall Effect switches or opto slotted couplers. Internal pull−up resistors are included to minimize the required number of external components. The inputs are TTL compatible, with their thresholds typically at 2.2 V. The MC33035 series is designed to control three phase motors and operate with four of the most common conventions of sensor phasing. A 60°/120°Select (Pin 22) is conveniently provided and affords the MC33035 to configure itself to control motors having either 60°, 120°, 240° or 300° electrical sensor phasing. With three sensor inputs there are eight possible input code combinations, six of which are valid rotor positions. The remaining two codes are invalid and are usually caused by an open or shorted sensor line. With six valid input codes, the decoder can resolve the motor rotor position to within a window of 60 electrical degrees.The Forward/Reverse input (Pin 3) is used to change the direction of motor rotation by reversing the voltage across the stator winding. When the input changes state, from high to low with a given sensor input code (for example 100), the enabled top and bottom drive outputs with the same alpha designation are exchanged (A T to A B, B T to B B, C T to C B). In effect, the commutation sequence is reversed and the motor changes directional rotation.Motor on/off control is accomplished by the Output Enable (Pin 7). When left disconnected, an internal 25 µA current source enables sequencing of the top and bottom drive outputs. When grounded, the top drive outputs turn off and the bottom drives are forced low, causing the motor to coast and the Fault output to activate.Dynamic motor braking allows an additional margin of safety to be designed into the final product. Braking is accomplished by placing the Brake Input (Pin 23) in a high state. This causes the top drive outputs to turn off and the bottom drives to turn on, shorting the motor−generated back EMF. The brake input has unconditional priority over all other inputs. The internal 40 kΩ pull−up resistor simplifies interfacing with the system safety−switch by insuring brake activation if opened or disconnected. The commutation logic truth table is shown in Figure 20. A four input NOR gate is used to monitor the brake input and the inputs to the three top drive output transistors. Its purpose is to disable braking until the top drive outputs attain a high state. This helps to prevent simultaneous conduction of the the top and bottom power switches. In half wave motor drive applications, the top drive outputs are not required and are normally left disconnected. Under these conditions braking will still be accomplished since the NOR gate senses the base voltage to the top drive output transistors.Error AmplifierA high performance, fully compensated error amplifier with access to both inputs and output (Pins 11, 12, 13) is provided to facilitate the implementation of closed loop motor speed control. The amplifier features a typical DC voltage gain of 80 dB, 0.6 MHz gain bandwidth, and a wide input common mode voltage range that extends from ground to V ref. In most open loop speed control applications, the amplifier is configured as a unity gain voltage follower with the noninverting input connected to the speed set voltage source. Additional configurations are shown in Figures 31 through 35.OscillatorThe frequency of the internal ramp oscillator is programmed by the values selected for timing components R T and C T. Capacitor C T is charged from the Reference Output (Pin 8) through resistor R T and discharged by an internal discharge transistor. The ramp peak and valley voltages are typically 4.1 V and 1.5 V respectively. To provide a good compromise between audible noise and output switching efficiency, an oscillator frequency in the range of 20 to 30 kHz is recommended. Refer to Figure 1 for component selection.Figure 19. Representative Block DiagramNOTES:1.V = Any one of six valid sensor or drive combinations X = Don’t care.2.The digital inputs (Pins 3, 4, 5, 6, 7, 22, 23) are all TTL compatible. The current sense input (Pin 9) has a 100 mV threshold with respect to Pin 15.A logic 0 for this input is defined as < 85 mV, and a logic 1 is > 115 mV.3.The fault and top drive outputs are open collector design and active in the low (0) state.4.With 60°/120°select (Pin 22) in the high (1) state, configuration is for 60°sensor electrical phasing inputs. With Pin 22 in low (0) state, configurationis for 120° sensor electrical phasing inputs.5.Valid 60° or 120° sensor combinations for corresponding valid top and bottom drive outputs.6.Invalid sensor inputs with brake = 0; All top and bottom drives off, Fault low.7.Invalid sensor inputs with brake = 1; All top drives off, all bottom drives on, Fault low.8.Valid 60° or 120°sensor inputs with brake = 1; All top drives off, all bottom drives on, Fault high.9.Valid sensor inputs with brake = 1 and enable = 0; All top drives off, all bottom drives on, Fault low.10.Valid sensor inputs with brake = 0 and enable = 0; All top and bottom drives off, Fault low.11.All bottom drives off, Fault low.Figure 20. Three Phase, Six Step Commutation Truth Table (Note 1)Pulse Width ModulatorThe use of pulse width modulation provides an energy efficient method of controlling the motor speed by varying the average voltage applied to each stator winding during the commutation sequence. As C T discharges, the oscillator sets both latches, allowing conduction of the top and bottom drive outputs. The PWM comparator resets the upper latch, terminating the bottom drive output conduction when the positive−going ramp of C T becomes greater than the error amplifier output. The pulse width modulator timing diagram is shown in Figure 21. Pulse width modulation for speed control appears only at the bottom drive outputs.Current LimitContinuous operation of a motor that is severely over−loaded results in overheating and eventual failure. This destructive condition can best be prevented with the use of cycle−by−cycle current limiting. That is, each on−cycle is treated as a separate event. Cycle−by−cycle current limiting is accomplished by monitoring the stator current build−up each time an output switch conducts, and upon sensing an over current condition, immediately turning off the switch and holding it off for the remaining duration of oscillator ramp−up period. The stator current is converted to a voltage by inserting a ground−referenced sense resistor R S (Figure 36) in series with the three bottom switch transistors (Q4, Q5, Q6). The voltage developed across the sense resistor is monitored by the Current Sense Input (Pins 9 and 15), and compared to the internal 100 mV reference. The current sense comparator inputs have an input common mode range of approximately 3.0 V. If the 100 mV current sense threshold is exceeded, the comparator resets the lower sense latch and terminates output switch conduction. The value for the current sense resistor is:R S+0.1I stator(max)The Fault output activates during an over current condition. The dual−latch PWM configuration ensures that only one single output conduction pulse occurs during any given oscillator cycle, whether terminated by the output of the error amp or the current limit comparator.Figure 21. Pulse Width Modulator Timing Diagram Current Sense Input Capacitor C T Error Amp Out/PWMInput Latch Set"Inputs Top Drive Outputs Bottom DriveOutputsFault OutputReferenceThe on−chip 6.25 V regulator (Pin 8) provides charging current for the oscillator timing capacitor, a reference for the error amplifier, and can supply 20 mA of current suitable for directly powering sensors in low voltage applications. In higher voltage applications, it may become necessary to transfer the power dissipated by the regulator off the IC. This is easily accomplished with the addition of an external pass transistor as shown in Figure 22. A 6.25 V reference level was chosen to allow implementation of the simpler NPN circuit, where V ref − V BE exceeds the minimum voltage required by Hall Effect sensors over temperature. With proper transistor selection and adequate heatsinking, up to one amp of load current can be obtained.Figure 22. Reference Output BuffersThe NPN circuit is recommended for powering Hall or opto sensors, where the output voltage temperature coefficient is not critical. The PNP circuit is slightly more complex, but is also more accurate over temperature. Neither circuit has current limiting.V V and Sensor Power6.25 VUndervoltage LockoutA triple Undervoltage Lockout has been incorporated to prevent damage to the IC and the external power switch transistors. Under low power supply conditions, it guarantees that the IC and sensors are fully functional, and that there is sufficient bottom drive output voltage. The positive power supplies to the IC (V CC ) and the bottom drives (V C ) are each monitored by separate comparators that have their thresholds at 9.1 V . This level ensures sufficient gate drive necessary to attain low R DS(on) when driving standard power MOSFET devices. When directly powering the Hall sensors from the reference, improper sensor operation can result if the reference output voltage falls below 4.5 V . A third comparator is used to detect this condition. If one or more of the comparators detects an undervoltage condition, the Fault Output is activated, the top drives are turned off and the bottom drive outputs are held in a low state. Each of the comparators contain hysteresis to prevent oscillations when crossing their respective thresholds.Fault OutputThe open collector Fault Output (Pin 14) was designed to provide diagnostic information in the event of a system malfunction. It has a sink current capability of 16 mA and can directly drive a light emitting diode for visual indication.Additionally, it is easily interfaced with TTL/CMOS logic for use in a microprocessor controlled system. The Fault Output is active low when one or more of the following conditions occur:1)Invalid Sensor Input code 2)Output Enable at logic [0]3)Current Sense Input greater than 100 mV4)Undervoltage Lockout, activation of one or more of the comparators5)Thermal Shutdown, maximum junction temperature being exceededThis unique output can also be used to distinguish between motor start−up or sustained operation in an overloaded condition. With the addition of an RC network between the Fault Output and the enable input, it is possible to create a time−delayed latched shutdown for overcurrent. The added circuitry shown in Figure 23 makes easy starting of motor systems which have high inertial loads by providing additional starting torque, while still preserving overcurrent protection. This task is accomplished by setting the current limit to a higher than nominal value for a predetermined time.During an excessively long overcurrent condition, capacitor C DLY will charge, causing the enable input to cross its threshold to a low state. A latch is then formed by the positive feedback loop from the Fault Output to the Output Enable.Once set, by the Current Sense Input, it can only be reset by shorting C DLY or cycling the power supplies.Drive OutputsThe three top drive outputs (Pins 1, 2, 24) are open collector NPN transistors capable of sinking 50 mA with a minimum breakdown of 30 V. Interfacing into higher voltage applications is easily accomplished with the circuits shown in Figures 24 and 25.The three totem pole bottom drive outputs (Pins 19, 20, 21) are particularly suited for direct drive of N−Channel MOSFETs or NPN bipolar transistors (Figures 26, 27, 28 and 29). Each output is capable of sourcing and sinking up to 100 mA. Power for the bottom drives is supplied from V C (Pin 18). This separate supply input allows the designer added flexibility in tailoring the drive voltage, independent of V CC. A zener clamp should be connected to this input when driving power MOSFETs in systems where V CC is greater than 20 V so as to prevent rupture of the MOSFET gates.The control circuitry ground (Pin 16) and current sense inverting input (Pin 15) must return on separate paths to the central input source ground.Thermal ShutdownInternal thermal shutdown circuitry is provided to protect the IC in the event the maximum junction temperature is exceeded. When activated, typically at 170°C, the IC acts as though the Output Enable was grounded.Figure 23. Timed Delayed Latched Over Current ShutdownFigure 24. High Voltage Interface withNPN Power TransistorsTransistor Q1 is a common base stage used to level shift from V CC to the high motor voltage, V M. The collector diode is required if V CC is present while V M is low.[R DLY C DLY Inǒ6.25–(20x10–6R DLY)1.4–(20x10R DLY)ǓFigure 25. High Voltage Interface withN−Channel Power MOSFETsFigure 26. Current Waveform Spike SuppressionFigure 27. MOSFET Drive Precautions Figure 28. Bipolar Transistor DriveSeries gate resistor R g will dampen any high frequency oscillations caused by the MOSFET input capacitance and any series wiring induction in the gate−source circuit. Diode D is required if the negative current into the Bot-tom Drive Outputs exceeds 50 mA.The totem−pole output can furnish negative base current for enhanced tran-sistor turn−off, with the addition of capacitor C.Figure 29. Current Sensing Power MOSFETs Figure 30. High Voltage Boost SupplyVirtually lossless current sensing can be achieved with the implementation of SENSEFET power switches.[R S @I pk @R DS(on)r DM(on))RS= 200 Ω, 1/4 W Pin 9 ≈ 0.75 I pkControl Circuitry Ground (Pin 16) and Current Sense Inverting Input (Pin 15)must return on separate paths to the Central Input Source Ground.This circuit generates V Boostfor Figure 25.Figure 31. Differential Input Speed Controller Figure 32. Controlled Acceleration/DecelerationV V A VPin 13+V A ǒR 3)R 41)R 2Ǔ R 23 *ǒR 43V B ǓResistor R 1 with capacitor C sets the acceleration time constant while R 2controls the deceleration. The values of R 1 and R 2 should be at least ten times greater than the speed set potentiometer to minimize time constant variations with different speed settings.This circuit can control the speed of a cooling fan proportional to the difference between the sensor and set temperatures. The control loop is closed as the forced air cools the NTC thermistor. For controlled heating applications, ex-change the positions of R1 and R2.Figure 35. Closed Loop Temperature ControlSYSTEM APPLICATIONSThree Phase Motor CommutationThe three phase application shown in Figure 36 is a full−featured open loop motor controller with full wave, six step drive. The upper power switch transistors are Darlingtons while the lower devices are power MOSFETs. Each of these devices contains an internal parasitic catch diode that is used to return the stator inductive energy back to the power supply. The outputs are capable of driving a delta or wye connected stator, and a grounded neutral wye if split supplies are used. At any given rotor position, only one top and one bottom power switch (of different totem poles) is enabled. This configuration switches both ends of the stator winding from supply to ground which causes the current flow to be bidirectional or full wave. A leading edge spike is usually present on the current waveform and can cause a current−limit instability. The spike can be eliminated by adding an RC filter in series with the Current Sense Input. Using a low inductance type resistor for R S will also aid in spike reduction. Care must be taken in the selection of the bottom power switch transistors so that the current during braking does not exceed the device rating. During braking, the peak current generated is limited only by the series resistance of the conducting bottom switch and winding.I peak+V M)EMFswitch)R windingIf the motor is running at maximum speed with no load, the generated back EMF can be as high as the supply voltage, and at the onset of braking, the peak current may approach twice the motor stall current. Figure 37 shows the commutation waveforms over two electrical cycles. The first cycle (0° to 360°) depicts motor operation at full speed while the second cycle (360° to 720°) shows a reduced speed with about 50% pulse width modulation. The current waveforms reflect a constant torque load and are shown synchronous to the commutation frequency for clarity.Figure 36. Three Phase, Six Step, Full Wave Motor ControllerFigure 37. Three Phase, Six Step, Full Wave Commutation WaveformsRotor Electrical Position (Degrees)100000001011111110100000001011111110720660600540480420360300240180120600S AS B S C CodeS C S B CodeS ASensor Inputs60°/120°Select PinOpenSensor Inputs60°/120°Select Pin GroundedA BB B Q 2 + Q 6C BQ 2 + Q 4Q 3 + Q 4Q 3 + Q 5Q 1 + Q 5Q 1 + Q 6Bottom DriveOutputsQ 2 + Q 6Q 2 + Q 4Q 3 + Q 4Q 3 + Q 5Motor DriveCurrentBFwd/Rev = 1C−O +−O +Conducting Power Switch TransistorsQ 1 + Q 5Top Drive OutputsQ 1 + Q 6AB T A TC T−O +100110001011001011110100010010101101Figure 38 shows a three phase, three step, half wave motor controller. This configuration is ideally suited for automotive and other low voltage applications since there is only one power switch voltage drop in series with a given stator winding. Current flow is unidirectional or half wave because only one end of each winding is switched. Continuous braking with the typical half wave arrangement presents a motor overheating problem since stator current is limited only by the winding resistance. This is due to the lack of upper power switch transistors, as in the full wave circuit, used to disconnect the windings from the supply voltage V M. A unique solution is to provide braking until the motor stops and then turn off the bottom drives. This can be accomplished by using the Fault Output in conjunction with the Output Enable as an over current timer. Components R DLY and C DLY are selected to give the motor sufficient time to stop before latching the Output Enable and the top drive AND gates low. When enabling the motor, the brake switch is closed and the PNP transistor (along with resistors R1 and R DLY) are used to reset the latch by discharging C DLY. The stator flyback voltage is clamped by a single zener and three diodes.Figure 38. Three Phase, Three Step, Half Wave Motor ControllerThree Phase Closed Loop ControllerThe MC33035, by itself, is only capable of open loop motor speed control. For closed loop motor speed control, the MC33035 requires an input voltage proportional to the motor speed. Traditionally, this has been accomplished by means of a tachometer to generate the motor speed feedback voltage. Figure 39 shows an application whereby an MC33039, powered from the 6.25 V reference (Pin 8) of the MC33035, is used to generate the required feedback voltage without the need of a costly tachometer. The same Hall sensor signals used by the MC33035 for rotor position decoding are utilized by the MC33039. Every positive or negative going transition of the Hall sensor signals on any of the sensor lines causes the MC33039 to produce an output pulse of defined amplitude and time duration, as determined by the external resistor R1 and capacitor C1. The output train of pulses at Pin 5 of the MC33039 are integrated by the error amplifier of the MC33035 configured as an integrator to produce a DC voltage level which is proportional to the motor speed. This speed proportional voltage establishes the PWM reference level at Pin 13 of the MC33035 motor controller and closes the feedback loop. The MC33035 outputs drive a TMOS power MOSFET 3−phase bridge. High currents can be expected during conditions of start−up, breaking, and change of direction of the motor.The system shown in Figure 39 is designed for a motor having 120/240 degrees Hall sensor electrical phasing. The system can easily be modified to accommodate 60/300 degree Hall sensor electrical phasing by removing the jumper (J2) at Pin 22 of the MC33035.Figure 39. Closed Loop Brushless DC Motor Control Using The MC33035 and MC33039。

第２５卷第５期舡韶越Ｖ０１．２５Ｎｏ．５２００７年１０月Ｌ舭Ｄ女嘶Ｍｍ№＂Ｏｃｔ２００７（安擞农业走学工学院，安徽舍肥２３００３６）摘要：国内电动丰无刷直流电机控制嚣大都采用分立元件，使得控制系统的设计调试复杂。

介绍了Ｍｏｔｏｒｏｌａ公司的第２代直流无刷电机控制器专用芯片ＭＣ３３０３５的基本原理，设计了一种基于ＭＣ３３０３５，Ｍｃ３３０３９，ＭＰＭ３００３的电动车闭环无刷电机控制器，介绍了具体参数。

所设计的电路抗干扰性强，可靠性高，稳定性好，可内嵌到电机内部。

关键词：无刷直流电机Ｉ闭环控制器｝ＭＣ３３０３５芯片中图分类号：ＴＰ２７ｌ；Ｖ４８４文献标志码：Ａ文章编号：１００５—２８９５（２００７）０５—００６１—０３０引盲近年来，由于石油能源的日益紧张及人们环境保护意识的增强，电动助力车深受欢迎。

永磁直流无刷电机驱动成为电动车的发展方向。

它由定子、转子和转子位置检测元件霍尔传感器等组成，既具备交流电机的结构简单、运行可靠、维护方便等优点，又具备了直流电机运行效率高，调速性能好等优点，在电动车等电器设备中得到广泛应用。

目前，国内电动车无刷直流电机控制器设计大都采用分立元件，使得控制系统的设计和调试复杂。

要占用较大的电路板，与把控制器内嵌到电机内部的要求相矛盾［１］。

Ｍｃ３３０３５是Ｍｏｔｏｒｏｌａ公司的第二代直流无刷电机控制器专用芯片，Ｍｃ３３０３９是Ｍｏｔｏｒｏｌａ公司生产的直流无刷电机控制器闭环速度控制专用芯片，ＭＰＭ３００３是Ｍｏｔｏｒｏｌａ公司生产的电机驱动芯片，输出最高峰值电流高达２５Ａ。

基于这３种芯片设计的电动车闭环无刷直流电机控制器所需的外围电路简单，抗干扰性强，可靠性高，稳定性好等优点，特别适合对控制器体积要求较高的场合ｏ－５３１控制芯片Ｍｃ３３０３５Ｍｃ３３０３５是２４脚的双列直插窄式集成电路块，其内部结构如图１所示。

其主要功能有：（１）转子位置译码器接受转子位置检测器的信号，处理后生成６路输出驱动信号控制逆变桥的正确换流；（２）故障与处理包括欠压、过热、误码、过流等；（３）正／反转控制改变６路输出驱动信号的顺序，以改变定子绕组的电流方向，从而改变电机转向；（４）制动封锁所有上桥臂的驱动信号，使电机与电源隔离，同时打开所有下桥臂的驱动信号，短接电机的电动势，使电机迅速减速；（５）内部振荡器决定ＰｗＭ的调制频率；（６）转速给定包括１个误差放大器和１个ＰｗＭ比较器，给定的转速信号与振荡器的输出锯齿波相比较，产生ＰｗＭ控制信号；（７）内部基准电压不仅用于内部比较器和振荡器的电源，还输出作为转子位置检测器的电源。

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CAN收发器:NXP恩智浦CAN收发器 Microchip微芯CAN收发器十.分销产品线:ONSEMI安森美 TI德州仪器 ADI TOSHIBA东芝 AVAGO安华高十一 MCU单片机ABOV现代单片机MC96F系列 Microchip微芯单片机PIC12F PIC16F PIC18F系列 FUJITSU富仕通单片机MB95F系列 STM单片机STM32F STM32L系列 CKS中科芯单片机CKS32F系列 TI单片机MSP430系列 TMS320F系列 NXP单片机LPC系列MC33035, NCV33035Brushless DC Motor ControllerThe MC33035 is a high performance second generation monolithic brushless DC motor controller containing all of the active functions required to implement a full featured open loop, three or four phase motor control system. This device consists of a rotor position decoder for proper commutation sequencing, temperature compensated reference capable of supplying sensor power, frequency programmable sawtooth oscillator, three open collector top drivers, and three high current totem pole bottom drivers ideally suited for driving power MOSFETs.Also included are protective features consisting of undervoltage lockout, cycle−by−cycle current limiting with a selectable time delayed latched shutdown mode, internal thermal shutdown, and a unique fault output that can be interfaced into microprocessor controlled systems.Typical motor control functions include open loop speed, forward or reverse direction, run enable, and dynamic braking. The MC33035 is designed to operate with electrical sensor phasings of 60︒/300︒ or 120︒/240︒, and can also efficiently control brush DC motors. Features123P SUFFIXPLASTIC PACKAGE CASE 724241DW SUFFIXPLASTIC PACKAGE CASE 751E24(SO−24L)1PIN CONNECTIONS∙ 10 to 30 V Operation ∙ Undervoltage Lockout∙ 6.25 V Reference Capable of Supplying Sensor Power ∙ Fully Accessible Error Amplifier for Closed Loop ServoApplications∙ High Current Drivers Can Control External 3−Phase MOSFET Bridge∙ Cycle−By−Cycle Current Limiting ∙ Pinned−Out Current Sense Reference ∙ Internal Thermal Shutdown∙ Selectable 60︒/300︒ or 120︒/240︒ Sensor Phasings∙ Can Efficiently Control Brush DC Motors with External MOSFET H−Bridge∙ NCV Prefix for Automotive and Other Applications Requiring Site and Control Changes∙ Pb−Free Packages are AvailableTop Drive B T OutputA TFwd/RevS A Sensor S InputsS COutput EnableReference Output Current Sense Noninverting Input Oscillator Error AmpNoninverting Input Error Amp Inverting Input C TBrake 60︒/120︒ Select A B Bottom B B Drive OutputsC B V C V CC Gnd Current Sense Inverting InputFault Output Error Amp Out/PWM Input(Top View)ORDERING INFORMATIONSee detailed ordering and shipping information in the package dimensions section on page 27 of this data sheet.DEVICE MARKING INFORMATIONSee general marking information in the device marking section on page 27 of this data sheet.© Semiconductor Components Industries, LLC, 20041 Publication Order Number:13 1214 11151016 917 818 7 19 620 5 21 422 23 24 BRepresentative Schematic Diagram This device contains 285 active transistors.MAXIMUM RATINGS1. The input common mode voltage or input signal voltage should not be allowed to go negative by more than 0.3 V.2. The compliance voltage must not exceed the range of −0.3 to V ref.3. NCV33035: T low = −40︒C, T high = 125︒C. Guaranteed by design. NCV prefix is for automotive and other applications requiring site and changecontrol.4. MC33035: T A = −40︒C to +85︒C; NCV33035: T A = −40︒C to +125︒C.5. Maximum package power dissipation limits must be observed.φ, E X C E S S P H A S E (D E G R E E S )V s a t , O U T P U T S A T U R A T I O N V O L T A G E (V )∆ , f O S C O S C I L L A T O R F R E Q U E N C Y C H A N G E (%)1004.02.0 10−0 1.010 1001000−R T , TIMING RESISTOR (k Ω) Figure 1. Oscillator Frequency versusTiming Resistor T A , AMBIENT TEMPERATURE (︒C)Figure 2. Oscillator Frequency Changeversus Temperature5648 40 32 24 16 8.0 0 − 8.0 −16 − 24 1.0 k10 k100 k1.0 M40 60 80100 120 140 160180 200 220 240 10 M− 0.8−1.61.60.8 0 01.02.03.04.05.0f, FREQUENCY (Hz)Figure 3. Error Amp Open Loop Gain andPhase versus Frequency I O , OUTPUT LOAD CURRENT (mA)Figure 4. Error Amp Output SaturationVoltage versus Load Current3.053.02.954.53.01.51.0 μs/DIVFigure 5. Error Amp Small−SignalTransient Response 5.0 μs/DIVFigure 6. Error Amp Large−SignalTransient ResponseA V O L , O P E N L O O P V O L T A G E G A I N (dB )f O S C , O S C I L L A T O R F R E Q U E N C Y (k H z )V O , O U T P U T V O L T A G E (V )V O , O U T P U T V O L T A G E (V )V s a t , O U T P U T S A T U R A T I O N V O L T A G E (V )− 4.0 − 8.0 − 12 − 16− 20− 241020304050607.0 6.0 5.0 4.0 3.0 2.01.00 010203040I ref , REFERENCE OUTPUT SOURCE CURRENT (mA)Figure 7. Reference Output Voltage Changeversus Output Source Current V CC , SUPPLY VOLTAGE (V)Figure 8. Reference Output Voltageversus Supply Voltage4020− 2− 41.02.03.04.05.0T A , AMBIENT TEMPERATURE (︒C) Figure 9. Reference Output Voltageversus Temperature PWM I NPUT V OLTAGE (V)Figure 10. Output Duty Cycle versusPWM Input Voltage250200 0.250.2150100 0.150.150 0.050 1.02.03.04.05.0 06.07.08.09.0104.08.0 12 16CURRENT SENSE INPUT VOLTAGE (NORMALIZED TO V th )Figure 11. Bottom Drive Response Time versusCurrent Sense Input Voltage I Sink , SINK CURRENT (mA)Figure 12. Fault Output Saturationversus Sink Current∆V r e f , R E F E R E N C E O U T P U T V O L T A G E C H A N G E (m V )∆V r e f , N O R M A L I Z E D R E F E R E N C E V O L T A G E C H A N G E (m V )t H L , B O T T O M D R I V E R E S P O N S E T I M E (n s ) O U T P U T D U T Y C Y C L E (%)V r e f , R E F E R E N C E O U T P U T V O L T A G E (V )1.21000.80.40 01020 I Sink , S INK C URRENT (mA)3040100 ns/DIVFigure 13. Top Drive Output SaturationVoltage versus Sink CurrentFigure 14. Top Drive Output Waveform1001000 050 ns/DIV50 ns/DIVFigure 15. Bottom Drive Output Waveform Figure 16. Bottom Drive Output Waveform−1.0− 2.02.01.00 02040601614 12 10 8.0 6.0 4.0 2.0 0 805.01015202530I O , OUTPUT LOAD CURRENT (mA)Figure 17. Bottom Drive Output SaturationVoltage versus Load Current V CC , SUPPLY VOLTAGE (V)Figure 18. Power and Bottom Drive SupplyCurrent versus Supply VoltageV s a t , O U T P U T S A T U R A T I O N V O L T A G E (V )O U T P U T V O L T A G E (%) V s a t , O U T P U T S A T U R A T I O N V O L T A G E (V )I C , I C C , P O W E R S U P P L Y C U R R E N T (m A )O U T P U T V O L T A G E (%)O U T P U T V O L T A G E (%)INTRODUCTIONThe MC33035 is one of a series of high performance monolithic DC brushless motor controllers produced by Motorola. It contains all of the functions required to implement a full−featured, open loop, three or four phase motor control system. In addition, the controller can be made to operate DC brush motors. Constructed with Bipolar Analog technology, it offers a high degree of performance and ruggedness in hostile industrial environments. The MC33035 contains a rotor position decoder for proper commutation sequencing, a temperature compensated reference capable of supplying a sensor power, a frequency programmable sawtooth oscillator, a fully accessible error amplifier, a pulse width modulator comparator, three open collector top drive outputs, and three high current totem pole bottom driver outputs ideally suited for driving power MOSFETs.Included in the MC33035 are protective features consisting of undervoltage lockout, cycle−by−cycle current limiting with a selectable time delayed latched shutdown mode, internal thermal shutdown, and a unique fault output that can easily be interfaced to a microprocessor controller.Typical motor control functions include open loop speed control, forward or reverse rotation, run enable, and dynamic braking. In addition, the MC33035 has a 60︒/120︒select pin which configures the rotor position decoder for either 60︒ or 120︒ sensor electrical phasing inputs. FUNCTIONAL DESCRIPTIONA representative internal block diagram is shown in Figure 19 with various applications shown in Figures 36, 38, 39, 43, 45, and 46. A discussion of the features and function of each of the internal blocks given below is referenced to Figures 19 and 36.Rotor Position DecoderAn internal rotor position decoder monitors the three sensor inputs (Pins 4, 5, 6) to provide the proper sequencing of the top and bottom drive outputs. The sensor inputs are designed to interface directly with open collector type Hall Effect switches or opto slotted couplers. Internal pull−up resistors are included to minimize the required number of external components. The inputs are TTL compatible, with their thresholds typically at 2.2 V. The MC33035 series is designed to control three phase motors and operate with four of the most common conventions of sensor phasing. A 60︒/120︒Select (Pin 22) is conveniently provided and affords the MC33035 to configure itself to control motors having either 60︒, 120︒, 240︒or 300︒electrical sensor phasing. With three sensor inputs there are eight possible input code combinations, six of which are valid rotor positions. The remaining two codes are invalid and are usually caused by an open or shorted sensor line. With six valid input codes, the decoder can resolve the motor rotor position to within a window of 60 electrical degrees.The Forward/Reverse input (Pin 3) is used to change the direction of motor rotation by reversing the voltage across the stator winding. When the input changes state, from high to low with a given sensor input code (for example 100), the enabled top and bottom drive outputs with the same alpha designation are exchanged (A T to A B, B T to B B, C T to C B). In effect, the commutation sequence is reversed and the motor changes directional rotation.Motor on/off control is accomplished by the Output Enable (Pin 7). When left disconnected, an internal 25 μA current source enables sequencing of the top and bottom drive outputs. When grounded, the top drive outputs turn off and the bottom drives are forced low, causing the motor to coast and the Fault output to activate.Dynamic motor braking allows an additional margin of safety to be designed into the final product. Braking is accomplished by placing the Brake Input (Pin 23) in a high state. This causes the top drive outputs to turn off and the bottom drives to turn on, shorting the motor−generated back EMF. The brake input has unconditional priority over all other inputs. The internal 40 kΩpull−up resistor simplifies interfacing with the system safety−switch by insuring brake activation if opened or disconnected. The commutation logic truth table is shown in Figure 20. A four input NOR gate is used to monitor the brake input and the inputs to the three top drive output transistors. Its purpose is to disable braking until the top drive outputs attain a high state. This helps to prevent simultaneous conduction of the the top and bottom power switches. In half wave motor drive applications, the top drive outputs are not required and are normally left disconnected. Under these conditions braking will still be accomplished since the NOR gate senses the base voltage to the top drive output transistors.Error AmplifierA high performance, fully compensated error amplifier with access to both inputs and output (Pins 11, 12, 13) is provided to facilitate the implementation of closed loop motor speed control. The amplifier features a typical DC voltage gain of 80 dB, 0.6 MHz gain bandwidth, and a wide input common mode voltage range that extends from ground to V ref. In most open loop speed control applications, the amplifier is configured as a unity gain voltage follower with the noninverting input connected to the speed set voltage source. Additional configurations are shown in Figures 31 through 35.OscillatorThe frequency of the internal ramp oscillator is programmed by the values selected for timing components R T and C T. Capacitor C T is charged from the Reference Output (Pin 8) through resistor R T and discharged by an internal discharge transistor. The ramp peak and valley voltages are typically 4.1 V and 1.5 V respectively. To provide a good compromise between audible noise and output switching efficiency, an oscillator frequency in the range of 20 to 30 kHz is recommended. Refer to Figure 1 for component selection.S A45 Sensor S BInputs 6S C3 Forward/Reverse60︒/120︒S elect22Output Enable 720 k20 k40 k25 μA20 k40 kRotorPositionDecoderV M14Fault Output2A T1 TopDriveB T Outputs24C TV in17V CC18V CUndervoltageLockout ReferenceReference Output 8Noninv. Input 11Faster 12 R T 13RegulatorError AmpPWM9.1 V4.5 VThermalShutdownLatch21A B20 BottomB B DriveOutputsError A mp Out R 19 PWM Input Q C BS10 Oscillator LatchC TSQ 40 kR9 Current Sense Input Sink Only= Positive TrueLogic WithHysteresis16 Gnd100 mV23Brake Input15 Current SenseReference InputFigure 19. Representative Block DiagramNOTES: 1. V = Any one of six valid sensor or drive combinations X = Don’t care.2. The digital inputs (Pins 3, 4, 5, 6, 7, 22, 23) are all TTL compatible. The current sense input (Pin 9) has a 100 mV threshold with respect to Pin 15.A logic 0 for this input is defined as < 85 mV, and a logic 1 is > 115 mV.3. The fault and top drive outputs are open collector design and active in the low (0) state.4. With 60︒/120︒select (Pin 22) in the high (1) state, configuration is for 60︒sensor electrical phasing inputs. With Pin 22 in low (0) state, configurationis for 120︒sensor electrical phasing inputs.5. Valid 60︒or 120︒sensor combinations for corresponding valid top and bottom drive outputs.6. Invalid sensor inputs with brake = 0; All top and bottom drives off, Fault low.7. Invalid sensor inputs with brake = 1; All top drives off, all bottom drives on, Fault low.8. Valid 60︒or 120︒sensor inputs with brake = 1; All top drives off, all bottom drives on, Fault high.9. Valid sensor inputs with brake = 1 and enable = 0; All top drives off, all bottom drives on, Fault low.10. Valid sensor inputs with brake = 0 and enable = 0; All top and bottom drives off, Fault l ow.11. All bottom drives off, Fault low.Figure 20. Three Phase, Six Step Commutation Truth Table (Note 1)Pulse Width ModulatorThe use of pulse width modulation provides an energy efficient method of controlling the motor speed by varying the average voltage applied to each stator winding during the commutation sequence. As C T discharges, the oscillator sets both latches, allowing conduction of the top and bottom drive outputs. The PWM comparator resets the upper latch, terminating the bottom drive output conduction when the positive−going ramp of C T becomes greater than the error amplifier output. The pulse width modulator timing diagram is shown in Figure 21. Pulse width modulation for speed control appears only at the bottom drive outputs.Current Limit sensing an over current condition, immediately turning off the switch and holding it off for the remaining duration of oscillator ramp−up period. The stator current is converted to a voltage by inserting a ground−referenced sense resistor R S (Figure 36) in series with the three bottom switch transistors (Q4, Q5, Q6). The voltage developed across the sense resistor is monitored by the Current Sense Input (Pins 9 and 15), and compared to the internal 100 mV reference. The current sense comparator inputs have an input common mode range of approximately 3.0 V. If the 100 mV current sense threshold is exceeded, the comparator resets the lower sense latch and terminates output switch conduction. The value for the current sense resistor is:Continuous operation of a motor that is severely over−loaded results in overheating and eventual failure.R S =I0.1stator(max)This destructive condition can best be prevented with the use of cycle−by−cycle current limiting. That is, each on−cycle is treated as a separate event. Cycle−by−cycle current limiting is accomplished by monitoring the stator current build−up each time an output switch conducts, and upon The Fault output activates during an over current condition. The dual−latch PWM configuration ensures that only one single output conduction pulse occurs during any given oscillator cycle, whether terminated by the output of the error amp or the current limit comparator.Capacitor C TError A mpOut/PWMInputCurrentSense InputLatch “Set"InputsTop D riveOutputsBottom DriveOutputsFault OutputFigure 21. Pulse Width Modulator Timing Diagram Reference Undervoltage LockoutA triple Undervoltage Lockout has been incorporated to prevent damage to the IC and the external power switch transistors. Under low power supply conditions, it guarantees that the IC and sensors are fully functional, and that there is sufficient bottom drive output voltage. The positive power supplies to the IC (V CC) and the bottom drives (V C) are each monitored by separate comparators that have their thresholds at 9.1 V. This level ensures sufficient gate drive necessary to attain low R DS(on) when driving standard power MOSFET devices. When directly powering the Hall sensors from the reference, improper sensor operation can result if the reference output voltage falls below 4.5 V. A third comparator is used to detect this condition. If one or more of the comparators detects an undervoltage condition, the Fault Output is activated, the top drives are turned off and the bottom drive outputs are held in a low state. Each of the comparators contain hysteresis to prevent oscillations when crossing their respective thresholds.The on−chip 6.25 V regulator (Pin 8) provides charging current for the oscillator timing capacitor, a reference for the error amplifier, and can supply 20 mA of current suitable for directly powering sensors in low voltage applications. In higher voltage applications, it may become necessary to transfer the power dissipated by the regulator off the IC. This is easily accomplished with the addition of an external pass transistor as shown in Figure 22. A 6.25 V reference level was chosen to allow implementation of the simpler NPN circuit, where V ref − V BE exceeds the minimum voltage required by Hall Effect sensors over temperature. With proper transistor selection and adequate heatsinking, up to one amp of load current can be obtained. Fault OutputThe open collector Fault Output (Pin 14) was designed to provide diagnostic information in the event of a system malfunction. It has a sink current capability of 16 mA and can directly drive a light emitting diode for visual indication. Additionally, it is easily interfaced with TTL/CMOS logic for use in a microprocessor controlled system. The Fault Output is active low when one or more of the following conditions occur:1)Invalid Sensor Input code2)Output Enable at logic [0]3)Current Sense Input greater than 100 mVV in1718REF UVLO 4)Undervoltage Lockout, activation of one or more ofthe comparators5)Thermal Shutdown, maximum junction temperaturebeing exceededThis unique output can also be used to distinguish betweenMPS 8 U01ATo motor start−up or sustained operation in an overloaded condition. With the addition of an RC network between the Fault Output and the enable input, it is possible to create aV in SensorPower5.6 V39ControlCircuitry6.25 V1718UVLOtime−delayed latched shutdown for overcurrent. The addedcircuitry shown in Figure 23 makes easy starting of motorsystems which have high inertial loads by providingadditional starting torque, while still preserving overcurrentprotection. This task is accomplished by setting the currentlimit to a higher than nominal value for a predetermined time.MPSU51A0.1 8REF During an excessively long overcurrent condition, capacitorC DLY will charge, causing the enable input to cross itsthreshold to a low state. A latch is then formed by the positiveTo Control Circuitryand Sensor Power6.25 VThe NPN circuit is recommended for powering Hall or opto sensors, where the output voltage temperature coefficient is not critical. The PNP circuit is slightly more complex, but is also more accurate over temperature. Neither circuit has current limiting.Figure 22. Reference Output Buffers feedback loop from the Fault Output to the Output Enable. Once set, by the Current Sense Input, it can only be reset by shorting C DLY or cycling the power supplies.(Drive OutputsThe three top drive outputs (Pins 1, 2, 24) are open collector NPN transistors capable of sinking 50 mA with a minimum breakdown of 30 V. Interfacing into higher voltage applications is easily accomplished with the circuits shown in Figures 24 and 25.The three totem pole bottom drive outputs (Pins 19, 20, 21) are particularly suited for direct drive of N−Channel MOSFETs or NPN bipolar transistors (Figures 26, 27, 28 and 29). Each output is capable of sourcing and sinking up to 100 mA. Power for the bottom drives is supplied from V C (Pin 18). This separate supply input allows the designer added flexibility in tailoring the drive voltage, independent of V CC . A zener clamp should be connected to this input when driving power MOSFETs in systems where V CC is greater than 20 V so as to prevent rupture of the MOSFET gates.The control circuitry ground (Pin 16) and current sense inverting input (Pin 15) must return on separate paths to the central input source ground.Thermal ShutdownInternal thermal shutdown circuitry is provided to protect the IC in the event the maximum junction temperature is exceeded. When activated, typically at 170 C, the IC acts as though the Output Enable was grounded.t DLY = R DLY C DLY InV ref – (I IL enable R DLY )V th enable – (I IL enable R DLY )(6.25 – (20 x 10–6 R DLY ))Transistor Q 1 is a common base stage used to level shift from V CC to the = R DLY C DLY In 1.4 – (20 x 10–6 RDLY )high motor voltage, V M . The collector diode is required if V CC is present while V M is low.Figure 23. Timed Delayed LatchedOver Current Shutdown Figure 24. High Voltage Interface withNPN Power Transistors)The addition of the RC filter will eliminate current−limit instability caused by the leading edge spike on the current waveform. Resistor R S should be a low in- ductance type.Figure 25. High Voltage Interface withN−Channel Power MOSFETsFigure 26. Current Waveform Spike SuppressionI B+ 0 t−Base Charge RemovalSeries gate resistor R g will dampen any high frequency oscillations caused by the MOSFET input capacitance and any series wiring induction in the gate−source circuit. Diode D is required if the negative current into the Bot- tom Drive Outputs exceeds 50 mA.The totem−pole output can furnish negative base current for enhanced tran- sistor turn−off, with the addition of capacitor C.Figure 27. MOSFET Drive PrecautionsFigure 28. Bipolar Transistor Drive21D SENSEFETG S MK20199 15R SPower Ground:To Input Source ReturnR S · I pk · R DS(on)100 mVV Pin 9 =r DM(on) + R S16 GndIf: SENSEFET = MPT10N10M R S = 200 Ω, 1/4 W Then : V Pin 9 ≈ 0.75 I pkControl Circuitry Ground (Pin 16) and Current Sense Inverting Input (Pin 15) must return on separate paths to the Central Input Source Ground.Virtually lossless current sensing can be achieved with the implementation of SENSEFET power switches.This circuit generates V Boost for Figure 25.Figure 29. Current Sensing Power MOSFETs Figure 30. High Voltage Boost SupplyV AV BV = V (R 3 + R 4) R 2(R 4 V )Resistor R 1 with capacitor C sets the acceleration time constant while R 2 controls the deceleration. The values of R 1 and R 2 should be at least ten Pin 13 A R 1 + R 2 3 —R 3 Btimes greater than the speed set potentiometer to minimize time constant variations with different speed settings.Figure 31. Differential Input Speed Controller Figure 32. Controlled Acceleration/DecelerationR B o o s t V o l t a g e (V )S N 74L S 145 ( )5.0 V16 11V CC Q 910 Q 8166 k 145 k100 k 8 REFQ 9 126 k 12 P313 BCD 14 P2 Inputs P1 7Q 6 7 Q 5 6 Q 4 5 108 k92.3 k 77.6 k 7 25 μA11EA1215 P0 Q 3 4 Q2 363.6 k 51.3 k 13 PWMQ 1Gnd Q 082 40.4 k 1The SN74LS145 is an open collector BCD to One of Ten decoder. When con- nected as shown, input codes 0000 through 1001 steps the PWM in incre- ments of approximately 10% from 0 to 90% on−time. Input codes 1010 through 1111 will produce 100% on−time or full motor speed.The rotor position sensors can be used as a tachometer. By differentiating the positive−going edges and then integrating them over time, a voltage proportional to speed can be generated. The error amp compares this volt- age to that of the speed set to control the PWM.Figure 33. Digital Speed Controller Figure 34. Closed Loop Speed ControlVR 3 + R 4RR4Pi n 3 =V ref V V ref 1 23 3 8 B =R 5 + 1 R 6R 1T7 R 511 R 2 312 25 μAEAR 3 >> R 5 ǁ R 66R 413PWM This circuit can control the speed of a cooling fan proportional to the differencebetween the sensor and set temperatures. The control loop is closed as the forced air cools the NTC thermistor. For controlled heating applications, ex- change the positions of R 1 and R 2.Figure 35. Closed Loop Temperature ControlR R。