电磁炉芯片

电磁炉芯片电磁炉芯片是指能够实现电磁炉基本功能的核心部件。

它通过控制功率电子器件的开启与关闭，来实现电磁炉的加热、温度控制和保护等功能。

电磁炉芯片作为电磁炉的“大脑”，对整个电磁炉的效率、安全性和使用寿命起到非常重要的作用。

首先，电磁炉芯片负责控制功率电子器件的开关。

电磁炉使用的是交流电，而电磁炉芯片通过对交流电进行适当的调整，将其转换为适合电磁炉使用的直流电。

这样可以确保功率电子器件能够正常工作，并且提高电磁炉的效率。

同时，电磁炉芯片还能够控制功率电子器件的开启与关闭时间，从而精确控制电磁炉的加热功率，使得食物可以均匀、快速地受热。

其次，电磁炉芯片还负责控制电磁炉的温度。

电磁炉芯片通过传感器感知电磁炉和食物的温度，再根据用户设定的温度，通过对功率电子器件的控制，实现对电磁炉的温度调节。

这样，无论是煮开水还是烹饪美食，都可以根据需要进行温度调节，保证食物的烹饪效果。

此外，电磁炉芯片还拥有丰富的保护功能。

电磁炉芯片可以监测功率电子器件和传感器的工作状态，一旦发现故障，如过载、短路或温度异常，电磁炉芯片会立即切断电源，以保护电磁炉和用户的安全。

此外，电磁炉芯片还有过热保护功能，当温度超过设定的安全范围时，电磁炉芯片会自动降低功率或关闭电源，以防止电磁炉的过热。

电磁炉芯片还具备通信功能，通过与电磁炉控制面板的互联，可以实现对电磁炉的参数设置和菜谱选择等功能。

电磁炉芯片还可以进行远程控制，通过手机等设备远程控制电磁炉的开关、温度和功率等参数，提供了更加便捷的使用体验。

总的来说，电磁炉芯片通过控制功率电子器件的开关、温度调节和保护功能，实现了电磁炉的基本功能。

它能够提高电磁炉的加热效率，保证食物的烹饪效果，同时还能保护电磁炉和用户的安全。

随着科技的进步，电磁炉芯片的功能也在不断提升，为用户带来更加便捷、安全、智能的使用体验。

电磁炉电源芯片SM7028升级版SM7028B
为顺应广大客户的需求，我司新推电磁炉电源芯片SM7028B，SM7028B是SM7028的升级版，能完全兼容SM7028。

另外，
SM7028B同时能兼容SM7026。

SM7028B是采用电流模式PWM控制方式的功率开关芯片，集成高压启动电路和高压功率管，为低成本开关电源系统提供高性价比的解决方案。

芯片VDD的工作电压范围宽，很方便的应用于充电器领域。

芯片提供了过温、过流、过压、欠压等保护功能，保证了系统的可靠性。

同时增加频谱扩展技术、优化驱动技术及减小启动时间，提升芯片性能。

SM7028B电源芯片管脚图
SM7028B电源芯片输出功率表
输入电压85Vac~265Vac180Vac~265Vac
输出功率15W20W
注：输出功率10W以上，建议根据实际方案增加散热措施：
1.5678脚增加PCB散热；
2.增加独立散热片；
3.其他散热措施。

典型示意电路图
SM7028B特点：
1.85Vac~265Vac宽电压输入
2.9V~30V宽VDD工作电压范围
3.60KHz固定开关频率
4.待机功耗小于120mW@220Vac
5.集成高压启动电路
6.集成高压功率开关
7.电流模式PWM控制方式
8.开机软启动功能
9.内置频谱扩展技术，改善EMC性能
10.内置过温、过流、过压、欠压等保护功能
11.封装形式：EDIP8
SM702B广泛应用于小家电电源、小功率充电器、适配器、待机电源、DVD/DVB以及其他便携式设备电源等领域。

电磁炉常用ic 看电源ＩＣ看电源ＩＣ各脚接法可以判断知道它型号!电磁炉常用电源ＩＣ一般有以下5种:1.VIPer12.2.VIPer22A,3.FSD200,4;THX201,5.TH X202H.看电源ＩＣ各脚接法可以判断知道它型号,如5--8连接一起接高压.一般是VIPer12A或VIPer22A,可以直接带换.如7.8接开关变压器.,6脚空,1脚接启动2M电阻的是THX202H.如只有7个脚是FSD200.有一只MJE13001--5三极管的接6脚的,一般是THX201.以上适用8脚电源ＩＣ识别方法尽供参考.以上只有1,2,可以直接带换,其它不可以直接带换/////////////////////电磁炉电源IC识别与代换电磁炉开关电源故障率较高,一般是模块炸裂损坏,有的模块型号看不清,给更换带来困难,根据引脚可以判断模块型号.电磁炉开关电源模块IC常用型号有6种:<1>VIPer12A<2>VIPer22A<3>THX201A<4>THX202H<5>FSD200<6>LNK364P如引脚5,6,7.8.接300V高压.1.2.脚接地.一般是:VIPer12A或VIPer22A<1><2>.两者可以直接带换.如引脚7脚接三极管MJE13007的基极,6脚接三极管的发射极,4.脚接地.2脚空,是:THX201A.如:只有7只脚.8脚接高压.7.脚接开关变压器.1.2.3.脚接地.无6脚.4.脚接三极管集电极.是:FSD200.如1脚接启动电阻.7.8.脚接开关变压器.3脚接地.6.脚空.是:THX202H.如1.2.7.8.脚接地.5脚接开关变压器,无6脚是LNK364P.供维修参考FSD200 电磁炉常用电源IC。

电磁炉电源芯片12a3脚对地电阻值文档下载说明Download tips: This document is carefully compiled by this editor. I hope that after you download it, it can help you solve practical problems. The document 电磁炉电源芯片12a3脚对地电阻值can be customized and modified after downloading, please adjust and use it according to actual needs, thank you! In addition, this shop provides you with various types of practical materials, such as educational essays, diary appreciation, sentence excerpts, ancient poems, classic articles, topic composition, work summary, word parsing, copy excerpts, other materials and so on, want to knowdifferent data formats and writing methods, please pay attention!电磁炉电源芯片是电磁炉的核心部件之一，其功能主要是对电源进行管理和控制，以确保电磁炉正常运行。

而电源芯片的12A3脚对地电阻值则是电磁炉电路中一个重要的参数，它直接影响到电磁炉的工作效率和安全性。

12A3脚对地电阻值是指电源芯片的第12脚到地之间的电阻数值。

这个数值一般是测量电源芯片的接地电阻，用来判断电源芯片是否正常工作。

电磁炉常用开关电源芯片介绍电磁炉虽然品牌厂家众多，但其内部构成原理都大同小异，今天我来给大家扒一扒电磁炉中常用的几种开关电源管理芯片，希望对从事此方面维修的师傅有所帮助。

•VIPER12AVPIER 12A是采用电流模式PWM控制方式的功率开关芯片，集成高压启动电路和高压功率管，为低成本开关电源系统提供高性价比的解决方案。

芯片VDD的工作电压范围宽，很方便的应用于充龟器领域。

另外还提供了过温、过流、过压等保护功能，保证了解系统的可靠性。

管脚示意图如下。

其中4脚VDD为芯片电源供电端，1、2脚为芯片内部MOS管的源极，同时也是芯片地。

3脚FB为反馈输入端，5678脚为芯片的启动端，同时作为内部MOS管的漏极。

维修时，可以用VIPER22A替换使用。

•THX203HTHX203H为高效能电流模式PWM控制器。

专为高性价比AC/DC转换器设计。

在85V-265V的宽电压范围内提供高达12W的连续输出功率，峰值输出功率更可以达到18W。

该电源控制器可工作于典型的反激电路拓扑中，构成简洁的AD/DC转换器。

其管脚示意图如下其中2脚和3脚为别为芯片供电端和接地端。

1脚OB为启动电流输入端，外接启动电阻。

4脚CT为振荡电容端，外接定时电容。

5脚FB为反馈端。

6脚IS为开关电流取样端口，外接取样电阻。

7脚和8脚为输出端，接开关变压器。

FSD200该芯片为双列直插7脚封装，内含700V耐压 SenseFET功率开关管。

工作电压230VAC，±15%时，输出功率5W；工作电压85-265VAC时，输出功率4W。

最高开关频率134kHz。

该控制芯片由一个耐压700V 的功率MOSFET 开关管和电源控制器两部分组成。

其控制方式不同于传统的PWM 型开关电源，采用简单的开/关控制输出电压，其瞬态响应时间比传统的PWM型要快，而且具有线电压欠压保护功能。

管脚图见下图。

其5脚VCC为供电脚，123脚GND为接地端，4脚VFB为电压反馈引脚，7脚DRAIN为内部MOS管的漏极，8脚VSTR为启动引脚。

电磁炉的晶板有什么作用电磁炉是一种利用电磁感应原理加热的厨房电器，它的工作原理是利用电磁感应加热锅具底部，从而实现加热食物的目的。

而电磁炉的晶板则是电磁炉的关键部件之一，它具有多种重要的作用，下面我们就来详细了解一下电磁炉的晶板有什么作用。

1. 传热效果好。

电磁炉的晶板是由特殊的材料制成的，可以有效地将电磁感应产生的热量传导到锅具底部，从而实现快速加热食物的目的。

晶板的材料通常是铁、铝等具有良好导热性能的金属材料，因此可以有效地提高电磁炉的传热效果，节约能源的同时也能够快速烹饪食物。

2. 温度控制精准。

电磁炉的晶板可以根据用户的设定精准地控制加热温度，从而实现更加精细化的烹饪操作。

晶板内部集成了先进的温控技术，可以实时监测锅具底部的温度并进行调节，确保食物的加热温度恰到好处，避免过热或者过冷的情况发生，保证食物的口感和营养。

3. 节能环保。

电磁炉的晶板在加热食物的过程中可以减少能量的浪费，因为它可以直接将热量传导到锅具底部，而不会像传统的燃气灶一样产生大量的热量散失。

此外，晶板还可以根据锅具的大小自动调节加热面积，避免能量的浪费，从而实现节能环保的效果。

4. 安全可靠。

晶板的材料通常是不易燃烧的金属材料，因此具有较高的耐高温性能和抗氧化性能，可以确保在高温环境下不会产生有害气体。

此外，晶板内部还集成了多种安全保护装置，可以在发生异常情况时及时切断电源，保障用户和设备的安全。

5. 易于清洁。

晶板的表面通常采用特殊的防污涂层处理，可以有效地防止食物残渣和油渍的附着，从而使清洁工作更加轻松。

用户只需用湿布擦拭晶板表面即可轻松清除污垢，不需要使用任何化学清洁剂，既方便又环保。

总的来说，电磁炉的晶板作为电磁炉的重要组成部分，具有传热效果好、温度控制精准、节能环保、安全可靠、易于清洁等多种重要作用。

它不仅可以提高电磁炉的加热效率，还可以保障用户和设备的安全，是电磁炉不可或缺的关键部件。

随着科技的不断进步，相信电磁炉的晶板会在未来发展出更多更加先进的功能，为用户带来更加便捷、高效的烹饪体验。

电磁炉电源芯片有几种电磁炉电源芯片主要有以下几种类型：1. PWM调制器芯片：PWM调制器芯片是一种常见的电磁炉电源芯片，它能够广泛应用于电磁炉的功率控制。

这种芯片通过改变脉冲宽度调制（PWM）的方式来改变电磁炉的输出功率，从而实现对电磁炉的温度控制。

PWM调制器芯片具有高效率、精确控制和稳定性强等特点，被广泛应用于电磁炉的控制系统中。

2. 开关电源芯片：开关电源芯片是电磁炉电源芯片中重要的一种类型。

开关电源芯片能够将输入电源的交流电转换成恒定的直流电，并提供给电磁炉的各个部件。

开关电源芯片具有高效率、小型化、稳定性好、输出电流能力强等优点，在电磁炉中的应用十分广泛。

3. 锁相环芯片：锁相环芯片是一种用于在电磁炉中生成定频脉冲的电源芯片。

锁相环芯片通过接收和分析外部频率信号，并根据设定的频率输出脉冲信号，从而控制电磁炉的工作频率。

锁相环芯片具有快速响应、频率稳定等特点，被广泛用于电磁炉的频率控制部分。

4. 驱动芯片：驱动芯片是电磁炉中用来驱动电源开关管的芯片。

它通过控制电源开关管的导通和断开，来实现对电源的开关控制，从而控制电磁炉的工作状态。

驱动芯片具有输出电流能力强、响应速度快等特点，被广泛应用于电磁炉的控制系统中。

5. 控制芯片：控制芯片是电磁炉电源芯片的核心部分，它负责电磁炉整个控制系统的功能实现。

控制芯片可以集成多种功能，如温度监测、自动控制、故障检测等。

这种芯片可以根据不同的需求和规格进行选择和设计，具有较高的灵活性和可定制性。

以上是电磁炉电源芯片的主要类型，它们在电磁炉的功率调节、工作频率控制、输出电流驱动等方面发挥着重要的作用。

不同类型的芯片可根据电磁炉的需求进行选择和组合使用，以实现电磁炉的稳定运行和高效工作。

LM139/LM239/LM339/LM2901/LM3302Low Power Low Offset Voltage Quad ComparatorsGeneral DescriptionThe LM139series consists of four independent precision voltage comparators with an offset voltage specification as low as 2mV max for all four comparators.These were de-signed specifically to operate from a single power supply over a wide range of voltages.Operation from split power supplies is also possible and the low power supply current drain is independent of the magnitude of the power supply voltage.These comparators also have a unique characteris-tic in that the input common-mode voltage range includes ground,even though operated from a single power supply voltage.Application areas include limit comparators,simple analog to digital converters;pulse,squarewave and time delay gen-erators;wide range VCO;MOS clock timers;multivibrators and high voltage digital logic gates.The LM139series was designed to directly interface with TTL and CMOS.When op-erated from both plus and minus power supplies,they will di-rectly interface with MOS logic —where the low power drain of the LM339is a distinct advantage over standard compara-tors.Advantagesn High precision comparatorsn Reduced V OS drift over temperature n Eliminates need for dual supplies n Allows sensing near GNDn Compatible with all forms of logicnPower drain suitable for battery operationFeaturesn Wide supply voltage range—LM139/139A Series 2to 36V DC or ±1to ±18V DC —LM2901:2to 36V DC or ±1to ±18V DC —LM3302:2to 28V DC or ±1to ±14V DC n Very low supply current drain (0.8mA)—independent of supply voltagen Low input biasing current:25nAn Low input offset current:±5nA n Offset voltage:±3mV n Input common-mode voltage range includes GND n Differential input voltage range equal to the power supply voltagen Low output saturation voltage:250mV at 4mA n Output voltage compatible with TTL,DTL,ECL,MOS and CMOS logic systemsConnection DiagramsDS005706-27Order Number LM139AW/883or LM139W/883(Note 1)LM139AWRQML and LM139AWRQMLV (Note 3)See NS Package Number W14BLM139AWGRQML and LM139AWGRQMLV (Note 3)See NS Package Number WG14ANovember 1999LM139/LM239/LM339/LM2901/LM3302Low Power Low Offset Voltage Quad Comparators©1999National Semiconductor Corporation Connection Diagrams(Continued)Note 1:Available per JM38510/11201Note 2:Available per SMD #5962-8873901Note 3:See STD Mil Dwg 5962R96738for Radiation Tolerant DeviceDual-In-Line PackageDS005706-2Order Number LM139J,LM139J/883(Note 1),LM139AJ,LM139AJ/883(Note 2),LM239J,LM239AJ,LM339J,LM139AJRQML and LM139AJRQMLV (Note 3)See NS Package Number J14AOrder Number LM339AM,LM339M or LM2901MSee NS Package Number M14AOrder Number LM339N,LM339AN,LM2901N or LM3302NSee NS Package Number N14AL M 139/L M 239/L M 339/L M 2901/L M 3302 2LM139/LM239/LM339/LM2901/LM3302 Absolute Maximum Ratings(Note13)If Military/Aerospace specified devices are required,please contact the National Semiconductor Sales Office/ Distributors for availability and specifications.LM139/LM239/LM339LM139A/LM239A/LM339A LM3302LM2901Supply Voltage,V+36V DC or±18V DC28V DC or±14V DC Differential Input Voltage(Note11)36V DC28V DCInput Voltage−0.3V DC to+36V DC−0.3V DC to+28V DCInput Current(V IN<−0.3V DC),(Note6)50mA50mAPower Dissipation(Note4)Molded DIP1050mW1050mWCavity DIP1190mWSmall Outline Package760mWOutput Short-Circuit to GND,(Note5)Continuous ContinuousStorage Temperature Range−65˚C to+150˚C−65˚C to+150˚CLead Temperature(Soldering,10seconds)260˚C260˚COperating Temperature Range−40˚C to+85˚CLM339/LM339A0˚C to+70˚CLM239/LM239A−25˚C to+85˚CLM2901−40˚C to+85˚CLM139/LM139A−55˚C to+125˚CSoldering InformationDual-In-Line PackageSoldering(10seconds)260˚C260˚CSmall Outline PackageVapor Phase(60seconds)215˚C215˚CInfrared(15seconds)220˚C220˚CSee AN-450“Surface Mounting Methods and Their Effect on Product Reliability”for other methods of soldering surface mount devices.ESD rating(1.5kΩin series with100pF)600V600VElectrical Characteristics(V+=5V DC,T A=25˚C,unless otherwise stated)Parameter Conditions LM139A LM239A,LM339A LM139UnitsMin Typ Max Min Typ Max Min Typ MaxInput Offset Voltage(Note12) 1.0 2.0 1.0 2.0 2.0 5.0mV DCInput Bias Current I IN(+)or I IN(−)with Output in251002525025100nA DCLinear Range,(Note8),V CM=0VInput Offset Current I IN(+)−I IN(−),V CM=0V 3.025 5.050 3.025nA DCInput Common-Mode V+=30V DC(LM3302,0V+−1.50V+−1.50V+−1.5V DCVoltage Range V+=28V DC)(Note9)Supply Current R L=∞on all Comparators,0.8 2.00.8 2.00.8 2.0mA DC R L=∞,V+=36V, 1.0 2.5 1.0 2.5mA DC(LM3302,V+=28V DC)Voltage Gain R L≥15kΩ,V+=15V DC502005020050200V/mV V o=1V DC to11V DCLarge Signal V IN=TTL Logic Swing,V REF=300300300nsResponse Time 1.4V DC,V RL=5V DC,R L=5.1kΩResponse Time V RL=5V DC,R L=5.1kΩ, 1.3 1.3 1.3µs(Note10)3Electrical Characteristics(Continued)(V +=5V DC ,T A =25˚C,unless otherwise stated)ParameterConditionsLM139A LM239A,LM339A LM139UnitsMin TypMaxMin Typ MaxMin TypMaxOutput Sink Current V IN(−)=1V DC ,V IN(+)=0, 6.016 6.016 6.016mA DC V O ≤1.5V DCSaturation Voltage V IN(−)=1V DC ,V IN(+)=0,250400250400250400mV DC I SINK ≤4mAOutput Leakage V IN(+)=1V DC ,V IN(−)=0,0.10.10.1nA DC CurrentV O =5V DCElectrical Characteristics(V +=5V DC ,T A =25˚C,unless otherwise stated)ParameterConditions LM239,LM339LM2901LM3302Units MinTyp Max Min TypMax Min TypMax Input Offset Voltage (Note 12)2.0 5.0 2.07.0320mV DC Input Bias Current I IN(+)or I IN(−)with Output in 252502525025500nA DC Linear Range,(Note 8),V CM =0V Input Offset Current I IN(+)−I IN(−),V CM =0V 5.0505503100nA DC Input Common-Mode V+=30V DC (LM3302,0V +−1.50V +−1.50V +−1.5V DC Voltage Range V+=28V DC )(Note 9)Supply CurrentR L =∞on all Comparators,0.8 2.00.8 2.00.8 2.0mA DC R L =∞,V +=36V, 1.02.51.02.51.02.5mA DC (LM3302,V+=28V DC )Voltage Gain R L ≥15k Ω,V +=15V DC 5020025100230V/mV V o =1V DC to 11V DCLarge Signal V IN =TTL Logic Swing,V REF =300300300nsResponse Time 1.4V DC ,V RL =5V DC ,R L =5.1k Ω,Response Time V RL =5V DC ,R L =5.1k Ω, 1.31.3 1.3µs (Note 10)Output Sink Current V IN(−)=1V DC ,V IN(+)=0, 6.016 6.016 6.016mA DC V O ≤1.5V DCSaturation Voltage V IN(−)=1V DC ,V IN(+)=0,250400250400250500mV DC I SINK ≤4mAOutput Leakage V IN(+)=1V DC ,V IN(−)=0,0.10.10.1nA DCCurrentV O =5V DCElectrical Characteristics(V +=5.0V DC ,(Note 7))ParameterConditionsLM139A LM239A,LM339A LM139UnitsMin TypMax Min TypMax Min TypMax Input Offset Voltage (Note 12)4.0 4.09.0mV DC Input Offset Current I IN(+)−I IN(−),V CM =0V100150100nA DC Input Bias Current I IN(+)or I IN(−)with Output in300400300nA DC Linear Range,V CM =0V (Note 8)Input Common-Mode V +=30V DC (LM3302,0V +−2.00V +−2.00V +−2.0V DC Voltage Range V +=28V DC )(Note 9)Saturation VoltageV IN(−)=1V DC ,V IN(+)=0,700700700mV DCI SINK ≤4mAL M 139/L M 239/L M 339/L M 2901/L M 33024Electrical Characteristics(Continued) (V+=5.0V DC,(Note7))Parameter ConditionsLM139A LM239A,LM339ALM139Units Min Typ Max Min Typ Max Min Typ MaxOutput Leakage Current V IN(+)=1V DC,V IN(−)=0, 1.0 1.0 1.0µA DCV O=30V DC,(LM3302,V O=28V DC)Differential Input Voltage Keep all V IN’s≥0V DC(or V−,363636V DCif used),(Note11)Electrical Characteristics(V+=5.0V DC,(Note7))Parameter Conditions LM239,LM339LM2901LM3302UnitsMin Typ Max Min Typ Max Min Typ MaxInput Offset Voltage(Note12)9.091540mV DCInput Offset Current I IN(+)−I IN(−),V CM=0V150********nA DCInput Bias Current I IN(+)or I IN(−)with Output in4002005001000nA DC Linear Range,V CM=0V(Note8)Input Common-Mode V+=30V DC(LM3302,V+=28V DC)V+−2.00V+−2.00V+−2.0V DC Voltage Range(Note9)Saturation Voltage V IN(−)=1V DC,V IN(+)=0,700400700700mV DCI SINK≤4mAOutput Leakage Current V IN(+)=1V DC,V IN(−)=0, 1.0 1.0 1.0µA DC V O=30V DC,(LM3302,V O=28V DC)Differential Input Voltage Keep all V IN’s≥0V DC(or V−,363628V DC if used),(Note11)Note4:For operating at high temperatures,the LM339/LM339A,LM2901,LM3302must be derated based on a125˚C maximum junction temperature and a thermal resistance of95˚C/W which applies for the device soldered in a printed circuit board,operating in a still air ambient.The LM239and LM139must be derated basedon a150˚C maximum junction temperature.The low bias dissipation and the“ON-OFF”characteristic of the outputs keeps the chip dissipation very small(P D≤100 mW),provided the output transistors are allowed to saturate.Note5:Short circuits from the output to V+can cause excessive heating and eventual destruction.When considering short circuits to ground,the maximum output current is approximately20mA independent of the magnitude of V+.Note6:This input current will only exist when the voltage at any of the input leads is driven negative.It is due to the collector-base junction of the input PNP tran-sistors becoming forward biased and thereby acting as input diode clamps.In addition to this diode action,there is also lateral NPN parasitic transistor action on the IC chip.This transistor action can cause the output voltages of the comparators to go to the V+voltage level(or to ground for a large overdrive)for the time duration that an input is driven negative.This is not destructive and normal output states will re-establish when the input voltage,which was negative,again returns to a value greater than−0.3V DC(at25˚)C.Note7:These specifications are limited to−55˚C≤T A≤+125˚C,for the LM139/LM139A.With the LM239/LM239A,all temperature specifications are limited to−25˚C≤T A≤+85˚C,the LM339/LM339A temperature specifications are limited to0˚C≤T A≤+70˚C,and the LM2901,LM3302temperature range is−40˚C≤T A≤+85˚C.Note8:The direction of the input current is out of the IC due to the PNP input stage.This current is essentially constant,independent of the state of the output so no loading change exists on the reference or input lines.Note9:The input common-mode voltage or either input signal voltage should not be allowed to go negative by more than0.3V.The upper end of the common-mode voltage range is V+−1.5V at25˚C,but either or both inputs can go to+30V DC without damage(25V for LM3302),independent of the magnitude of V+.Note10:The response time specified is a100mV input step with5mV overdrive.For larger overdrive signals300ns can be obtained,see typical performance char-acteristics section.Note11:Positive excursions of input voltage may exceed the power supply level.As long as the other voltage remains within the common-mode range,the com-parator will provide a proper output state.The low input voltage state must not be less than−0.3V DC(or0.3V DC below the magnitude of the negative power supply, if used)(at25˚C).Note12:At output switch point,V O≅1.4V DC,R S=0Ωwith V+from5V DC to30V DC;and over the full input common-mode range(0V DC to V+−1.5V DC),at25˚C.For LM3302,V+from5V DC to28V DC.Note13:Refer to RETS139AX for LM139A military specifications and to RETS139X for LM139military specifications.LM139/LM239/LM339/LM2901/LM33025Typical Performance CharacteristicsLM139/LM239/LM339,LM139A/LM239A/LM339A,LM3302Typical Performance CharacteristicsLM2901Supply CurrentDS005706-34Input CurrentDS005706-35Output Saturation VoltageDS005706-36Response Time for Various Input Overdrives —Negative TransitionDS005706-37Response Time for Various Input Overdrives —Positive TransitionDS005706-38Supply CurrentDS005706-39Input CurrentDS005706-40Output Saturation VoltageDS005706-41L M 139/L M 239/L M 339/L M 2901/L M 3302 6Typical Performance CharacteristicsLM2901(Continued)Application HintsThe LM139series are high gain,wide bandwidth devices which,like most comparators,can easily oscillate if the out-put lead is inadvertently allowed to capacitively couple to the inputs via stray capacitance.This shows up only during the output voltage transition intervals as the comparator changes states.Power supply bypassing is not required to solve this problem.Standard PC board layout is helpful as it reduces stray input-output coupling.Reducing this input re-sistors to <10k Ωreduces the feedback signal levels and fi-nally,adding even a small amount (1to 10mV)of positive feedback (hysteresis)causes such a rapid transition that os-cillations due to stray feedback are not possible.Simply socketing the IC and attaching resistors to the pins will cause input-output oscillations during the small transition intervals unless hysteresis is used.If the input signal is a pulse wave-form,with relatively fast rise and fall times,hysteresis is not required.All pins of any unused comparators should be tied to the negative supply.The bias network of the LM139series establishes a drain current which is independent of the magnitude of the power supply voltage over the range of from 2V DC to 30V DC .It is usually unnecessary to use a bypass capacitor across the power supply line.The differential input voltage may be larger than V +without damaging the device.Protection should be provided to pre-vent the input voltages from going negative more than −0.3V DC (at 25˚C).An input clamp diode can be used as shown in the applications section.The output of the LM139series is the uncommitted collector of a grounded-emitter NPN output transistor.Many collectors can be tied together to provide an output OR’ing function.An output pull-up resistor can be connected to any available power supply voltage within the permitted supply voltage range and there is no restriction on this voltage due to the magnitude of the voltage which is applied to the V +terminal of the LM139A package.The output can also be used as a simple SPST switch to ground (when a pull-up resistor is not used).The amount of current which the output device can sink is limited by the drive available (which is independent of V +)and the βof this device.When the maximum current limit is reached (approximately 16mA),the output transistor will come out of saturation and the output voltage will rise very rapidly.The output saturation voltage is limited by the ap-proximately 60ΩR SAT of the output transistor.The low offset voltage of the output transistor (1mV)allows the output to clamp essentially to ground level for small load currents.Typical Applications(V +=5.0V DC )Response Time for Various Input Overdrives —Negative TransitionDS005706-42Response Time for Various Input Overdrives-Positive TransitionDS005706-43Basic ComparatorDS005706-3Driving CMOSDS005706-4Driving TTLDS005706-5LM139/LM239/LM339/LM2901/LM33027Typical Applications(V +=5.0V DC )(Continued)Typical Applications(V +=15V DC )AND GateDS005706-8OR GateDS005706-9One-Shot Multivibrator 8LM139/LM239/LM339/LM2901/LM3302Typical Applications(V+=15V)(Continued)DCOne-Shot Multivibrator with Input Lock Out Array DS005706-129Typical Applications(V +=15V DC )(Continued)Large Fan-In AND GateDS005706-13ORing the OutputsDS005706-15L M 139/L M 239/L M 339/L M 2901/L M 3302 10LM139/LM239/LM339/LM2901/LM3302Typical Applications(V+=15V)(Continued)DCPulse Generator Array DS005706-1711Typical Applications(V +=15V DC )(Continued)Time Delay GeneratorDS005706-14Non-Inverting Comparator with Hysteresis DS005706-18Inverting Comparator with HysteresisDS005706-19L M 139/L M 239/L M 339/L M 2901/L M 3302 12Typical Applications(V +=15V DC )(Continued)Squarewave OscillatorDS005706-16Basic ComparatorDS005706-24Comparing Input Voltages of Opposite PolarityDS005706-20LM139/LM239/LM339/LM2901/LM330213Typical Applications(V +=15V DC )(Continued)Output StrobingDS005706-22*Or open-collector logic gate without pull-up resistorCrystal Controlled OscillatorDS005706-25L M 139/L M 239/L M 339/L M 2901/L M 3302 14Typical Applications(V +=15V DC )(Continued)T w o -D e c a d e H i g h -F r e q u e n c y V C OD S 005706-23V +=+30V D C250m V D C ≤V C ≤+50V D C700H z ≤f o ≤100k H zLM139/LM239/LM339/LM2901/LM330215Typical Applications(V +=15V DC )(Continued)Split-Supply Applications(V +=+15V DC and V −=−15V DC )Transducer AmplifierDS005706-28Zero Crossing Detector (Single Power Supply)DS005706-30MOS Clock DriverDS005706-31L M 139/L M 239/L M 339/L M 2901/L M 3302 16Split-Supply Applications(V +=+15V DC and V −=−15V DC )(Continued)Schematic DiagramZero Crossing DetectorDS005706-32Comparator With a NegativeReferenceDS005706-33DS005706-1LM139/LM239/LM339/LM2901/LM330217Physical Dimensionsinches (millimeters)unless otherwise notedCeramic Dual-In-Line Package (J)Order Number LM139J,LM139J/883,LM139AJ,LM139AJ/883,LM239J,LM239AJ,LM339JNS Package Number J14AS.O.Package (M)Order Number LM339AM,LM339M or LM2901MNS Package Number M14AL M 139/L M 239/L M 339/L M 2901/L M 3302 18Physical Dimensionsinches (millimeters)unless otherwise noted (Continued)Molded Dual-In-Line Package (N)Order Number LM339N,LM339AN,LM2901N or LM3302NNS Package Number N14AOrder Number LM139AW/883or LM139W/883NS Package Number W14BLM139/LM239/LM339/LM2901/LM330219NotesLIFE SUPPORT POLICYNATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION.As used herein:1.Life support devices or systems are devices or systems which,(a)are intended for surgical implant into the body,or (b)support or sustain life,and whose failure to perform when properly used in accordance with instructions for use provided in the labeling,can be reasonably expected to result in a significant injury to the user.2.A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system,or to affect its safety or effectiveness.National Semiconductor Corporation AmericasTel:1-800-272-9959Fax:1-800-737-7018Email:support@National Semiconductor EuropeFax:+49(0)180-5308586Email:europe.support@Deutsch Tel:+49(0)180-5308585English Tel:+49(0)180-5327832Français Tel:+49(0)180-5329358Italiano Tel:+49(0)180-5341680National Semiconductor Asia Pacific Customer Response Group Tel:65-2544466Fax:65-2504466Email:sea.support@National Semiconductor Japan Ltd.Tel:81-3-5639-7560Fax:81-3-5639-7507L M 139/L M 239/L M 339/L M 2901/L M 3302L o w P o w e r L o w O f f s e t V o l t a g e Q u a d C o m p a r a t o r sNational does not assume any responsibility for use of any circuitry described,no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.。

电磁炉电源管理芯片VIPer22A测量电磁炉常用的电源芯片22A，它的型号全称是VIPer22A，这是一个常用的小功率开关电源驱动芯片，芯片集成了功率开关管，输入电压合适散热良好的情况下，其最大的输出功率可以到20W。

这个电源芯片是家用电器，比如电磁炉、饮水机等非常常用的。

VIPer22A芯片简介VIPer22A芯片基本参数VIPer22A是ST公司推出的一款小功率内置开关管的开关电源驱动芯片，欧标电压输入范围内，直插封装的最大输出功率可以到20W，贴片封装的输出功率为12W；如果是宽电压输入范围，直插封装的输出功率为12W，贴片封装的输出功率为7W。

VIPer22A的工作电压范围比较宽，为9V-38V；它的开关震荡频率固定，典型值为60kHz。

VIPer22A芯片内部结构VIPer22A芯片引脚功能排序VIPer22A芯片的引脚功能如下：1、2号引脚为内部开关管的源极；3号引脚为反馈信号输入端；4号引脚为芯片的电源供电端；5-8号引脚为内部开关管的漏极。

VIPer22A 芯片应用电路及工作原理。

电磁炉电源芯片8脚测量都是300V是怎么回事上图是以22A作为主控芯片的电磁炉电源电路，这是一个非隔离型开关电源，电路原理中省略掉了交流输入的整流及滤波电路。

它的工作过程是：300V左右的直流电压输入之后，通过变压器的初级绕组连接到芯片内部开关管的漏极，由芯片内部的电压源从开关管漏极获得电源，经过降压后给芯片提供启动电压。

芯片启动后，内部的开关管就会产生高速开关，将输入的直流电变换成脉动直流后输入到开关变压器的初级，由变压器次级感应出的电压分为两路，一路为18V 电压，一路为经过7805稳压后的5V电压。

18V电压同时返回芯片的4号引脚，给芯片供电。

由于这个电源为非隔离型电源，所以它的电压反馈没有经过光耦的隔离，而是由输出端经过稳压二极管输入到芯片的3号引脚，也就是电压反馈端。

当输出的电压超过稳压二极管的稳压值后，二极管会击穿，从而是芯片调整脉宽，控制输出电压。