下载文档原格式
标准线性电源之常用芯片TI 德州仪器固定输出稳压器,可调分流电压稳压器 ,可调稳压器1.固定输出稳压器（标准线性电源）2.MC79L05ACLPR：小电流负电压稳压器3.MC79L12ACLP：小电流负电压稳压器4.MC79L15ACLP：小电流负电压稳压器5.TL780-05KCS：5V,1.5A稳压器6.TL780-12KCS：12V,1.5A稳压器7.TL780-15KCS：15V,1.5A稳压器8.UA7805CKC：5V通用大电流正电压稳压器9.UA7810CKC：10V通用大电流正电压稳压器10.UA7812CKC：12V通用大电流正电压稳压器11.UA7815CKC：15V通用大电流正电压稳压器12.UA78L02ACLP：2V用小电流正电压稳压器13.UA78L05ACD：5V,100mA电压稳压器14.UA78L05ACLP：5V通用小电流正电压稳压器15.UA78L05ACPK：5V,100mA电压稳压器16.UA78L05CLP：通用低电流正电压稳压器17.UA78L06ACLP：6V通用小电流正电压稳压器18.UA78L08ACLP：8V通用小电流正电压稳压器19.UA78L09ACLP：9V通用小电流正电压稳压器20.UA78L09CLP：9V通用小电流正电压稳压器21.UA78L12ACPK：12V,100mA电压稳压器22.UA78L15ACLP：15V通用小电流正电压稳压器23.UA78M05IDCY：5V,500mA固定输出电压稳压器24.可调分流电压稳压器（标准线性电源）25.TL431ACDBVR：3端可调精密分流稳压器26.TL431ACDR：3端可调精密分流稳压器27.TL431ACLP：3端可调精密分流稳压器28.TL431AIDBVR：3端可调精密分流稳压器29.TL431AIDBVT：3端可调精密分流稳压器30.TL431AILP：3端可调精密分流稳压器31.TL431AILPR：3端可调精密分流稳压器32.TL431BILP：3端可调精密分流稳压器33.TL431CD：3端可调精密分流稳压器34.TL431CDR：3端可调精密分流稳压器35.TL431CLP：3端可调精密分流稳压器36.TL431CLPR：3端可调精密分流稳压器37.TL431IDBVT：3端可调精密分流稳压器38.TL431QPK：3端可调精密分流稳压器39.TLV431ACDBVR：低压可调精密分流稳压器40.TLV431IDBVT：低压可调精密分流稳压器41.可调稳压器（标准线性电源）42.LM317DCY：1.5A可调稳压器43.LM317KC：3端1.5A可调稳压器44.LM317KTER：3端1.5A可调稳压器45.LM317MDCYR：3端500mA可调稳压器46.LM317MKTPR：3端500mA可调稳压器47.LM337KC：3端1.5A可调稳压器48.TL317CLP：3端100mA可调稳压器49.TL783CKC：高电压大电流可调输出稳压器50.TL783CKTER：高电压大电流可调输出稳压器51.UA723CN：可调150mA精密稳压器ON 安森美固定输出稳压器,可调分流电压稳压器 ,可调稳压器1.固定输出稳压器（标准线性电源）2.LM350TG：三端负固定电压的稳压器3.MC7805ABD2T：三端正固定电压的稳压器4.MC7805ABD2TG：三端正固定电压的稳压器5.MC7805ABD2TR4G：三端正固定电压的稳压器6.MC7805ABT：三端正固定电压的稳压器7.MC7805ABTG：三端正固定电压的稳压器8.MC7805ACD2TR4G：三端正固定电压的稳压器9.MC7805ACTG：三端正固定电压的稳压器10.MC7805BD2TG：三端正固定电压的稳压器11.MC7805BD2TR4G：三端正固定电压稳压器12.MC7805BDTG：三端正固定电压稳压器13.MC7805BDTRKG：三端正固定电压的稳压器14.MC7805BT：三端正固定电压的稳压器15.MC7805BTG：三端正固定电压的稳压器16.MC7805CD2TG：三端正固定电压稳压器17.MC7805CD2TR4：三端正固定电压的稳压器18.MC7805CD2TR4G：三端正固定电压的稳压器19.MC7805CDTRKG：三端正固定电压的稳压器20.MC7805CT：三端正固定电压的稳压器21.MC7805CTG：三端正固定电压的稳压器22.MC7806BD2TG：三端正固定电压的稳压器23.MC7806BD2TR4G：三端正固定电压的稳压器24.MC7808ABD2TG：三端正固定电压稳压器25.MC7808ABD2TR4G：三端正固定电压稳压器26.MC7808ABT：三端正固定电压的稳压器27.MC7808ABTG：三端正固定电压的稳压器28.MC7808BD2TR4：三端正固定电压的稳压器29.MC7808BD2TR4G：三端正固定电压的稳压器30.MC7808BDTRKG：三端正固定电压的稳压器31.MC7808CD2TR4G：三端正固定电压稳压器33.MC7809BTG：三端正固定电压的稳压器34.MC7809CD2TG：三端正固定电压的稳压器35.MC7809CD2TR4：三端正固定电压的稳压器36.MC7809CD2TR4G：三端正固定电压的稳压器37.MC7809CTG：三端正固定电压的稳压器38.MC7812ABD2TG：三端正固定电压的稳压器39.MC7812ABD2TR4G：三端正固定电压的稳压器40.MC7812ABT：三端正固定电压的稳压器41.MC7812ABTG：三端正固定电压的稳压器42.MC7812ACD2TG：三端正固定电压的稳压器43.MC7812ACD2TR4G：三端正固定电压的稳压器44.MC7812ACTG：三端正固定电压的稳压器45.MC7812BD2TG：三端正固定电压的稳压器46.MC7812BD2TR4G：三端正固定电压的稳压器47.MC7812BDTRKG：三端正固定电压的稳压器48.MC7812BTG：三端正固定电压的稳压器49.MC7812CD2TR4：三端正固定电压的稳压器50.MC7812CDTRKG：三端正固定电压的稳压器51.MC7812CT：三端正固定电压的稳压器52.MC7812CTG：三端正固定电压的稳压器53.MC7815ABD2TR4G：三端正固定电压的稳压器54.MC7815ABT：三端正固定电压的稳压器55.MC7815ABTG：三端正固定电压的稳压器56.MC7815ACTG：三端正固定电压的稳压器57.MC7815CD2TG：三端正固定电压稳压器58.MC7815CD2TR4：三端正固定电压的稳压器59.MC7815CDTRKG：三端正固定电压的稳压器60.MC7815CT：三端正固定电压的稳压器61.MC7815CTG：三端正固定电压的稳压器62.MC7818BTG：三端正固定电压稳压器63.MC7824BD2TR4：三端正固定电压的稳压器64.MC7824CT：三端正固定电压的稳压器65.MC7824CTG：三端正固定电压的稳压器66.MC78L05ABDR2G：三端正固定电压稳压器67.MC78L05ABP：三端小电流正固定电压稳压器68.MC78L05ABPG：三端正固定电压的稳压器69.MC78L05ABPRAG：三端正固定电压稳压器70.MC78L05ABPREG：三端正固定电压稳压器71.MC78L05ABPRMG：三端正固定电压的稳压器72.MC78L05ACDG：三端小电流正固定电压稳压器73.MC78L05ACDR2：三端小电流正固定电压稳压器74.MC78L05ACPG：三端正固定电压的稳压器75.MC78L05ACPRMG：三端正固定电压的稳压器77.MC78L08ABPG：三端小电流正固定电压稳压器78.MC78L08ACDR2：三端小电流正固定电压稳压器79.MC78L08ACPG：三端小电流正固定电压稳压器80.MC78L09ABPRA：三端小电流正固定电压稳压器81.MC78L09ACDR2：三端小电流正固定电压稳压器82.MC78L12ABPG：三端小电流正固定电压稳压器83.MC78L12ACDR2：三端小电流正固定电压稳压器84.MC78L12ACPG：三端小电流正固定电压稳压器85.MC78L15ABDR2G：三端小电流正固定电压稳压器86.MC78L15ABPG：三端正固定电压的稳压器87.MC78L15ACDR2：三端小电流正固定电压稳压器88.MC78L18ACP：三端小电流正固定电压稳压器89.MC78L24ACP：三端小电流正固定电压稳压器90.MC78LC15NTRG：三端小电流正固定电压稳压器91.MC78LC18NTRG：三端正固定电压稳压器92.MC78LC30HT1G：三端正固定电压的稳压器93.MC78LC33HT1G：三端正固定电压的稳压器94.MC78LC33NTRG：三端正固定电压的稳压器95.MC78LC50HT1G：三端正固定电压的稳压器96.MC78LC50NTRG：三端正固定电压的稳压器97.MC78M05ABDT：三端中电流正固定电压稳压器98.MC78M05ABDTRKG：三端正固定电压的稳压器99.MC78M05ABT：三端正固定电压的稳压器100.MC78M05ABTG：三端正固定电压的稳压器101.MC78M05ACDTRKG：三端正固定电压稳压器102.MC78M05BDT：三端正固定电压的稳压器103.MC78M05BDTRK：三端正固定电压的稳压器104.MC78M05BDTRKG：三端正固定电压的稳压器105.MC78M05CDTG：三端正固定电压稳压器106.MC78M05CDTRK：三端中电流正固定电压稳压器107.MC78M05CDTRKG：三端正固定电压的稳压器108.MC78M05CTG：三端正固定电压的稳压器109.MC78M06CDTRK：三端中电流正固定电压稳压器110.MC78M08ACDTRK：三端中电流正固定电压稳压器111.MC78M08BDT：500mA正输出电压稳压器112.MC78M08BDTG：三端正固定电压的稳压器113.MC78M08BDTRKG：三端正固定电压的稳压器114.MC78M08CDTG：三端正固定电压的稳压器115.MC78M08CDTRKG：三端正固定电压稳压器116.MC78M09BDT：500mA正输出电压稳压器117.MC78M09BDTG：三端正固定电压的稳压器118.MC78M09BDTRKG：三端正固定电压稳压器119.MC78M09CDTRK：三端中电流正固定电压稳压器121.MC78M12ABDTG：三端正固定电压的稳压器122.MC78M12ABDTRKG：三端正固定电压的稳压器123.MC78M12ABTG：三端正固定电压的稳压器124.MC78M12BDT：500mA正输出电压稳压器125.MC78M12BDTRKG：500mA正输出电压稳压器126.MC78M12BTG：500mA正输出电压稳压器127.MC78M12CDTG：三端正固定电压的稳压器128.MC78M12CDTRK：三端中电流正固定电压稳压器129.MC78M12CTG：三端正固定电压的稳压器130.MC78M15ABT：三端正固定电压的稳压器131.MC78M15BDT：500mA正输出电压稳压器132.MC78M15BDTG：三端正固定电压的稳压器133.MC78M15BDTRKG：500mA正输出电压稳压器134.MC78M15BTG：三端正固定电压的稳压器135.MC78M15CDTG：三端正固定电压的稳压器136.MC78M15CDTRK：三端中电流正固定电压稳压器137.MC78M24CT：三端中电流正固定电压稳压器138.MC78M24CTG：三端正固定电压的稳压器139.MC78PC18NTRG：低噪音低压差线性稳压器140.MC78PC25NTRG：150mA正输出电压稳压器141.MC78PC30NTRG：低噪音低压差线性稳压器142.MC78PC50NTRG：低噪音低压差线性稳压器143.MC7905.2CTG：1A负压稳压器144.MC7905ACD2TG：1A负压稳压器145.MC7905ACD2TR4G：1A负压稳压器146.MC7905ACTG：1A负压稳压器147.MC7905BD2TG：1A负压稳压器148.MC7905BD2TR4：三端负固定电压的稳压器149.MC7905BD2TR4G：1A负压稳压器150.MC7905CT：三端负固定电压的稳压器151.MC7905CTG：1A负压稳压器152.MC7906CD2T：三端负固定电压的稳压器153.MC7908CD2TG：1A负压稳压器154.MC7908CD2TR4G：1A负压稳压器155.MC7908CT：三端负固定电压的稳压器156.MC7912ACTG：1A负压稳压器157.MC7912BD2TR4G：1A负压稳压器158.MC7912BTG：1A负压稳压器159.MC7912CD2TR4：三端负固定电压的稳压器160.MC7912CT：三端负固定电压的稳压器161.MC7912CTG：1A负压稳压器162.MC7915ACD2TG：三端负固定电压的稳压器163.MC7915BD2TG：1A负压稳压器164.MC7915BTG：1A负压稳压器165.MC7915CT：三端负固定电压的稳压器166.MC7915CTG：1A负压稳压器167.MC7918CT：三端负固定电压的稳压器168.MC7924CT：三端负固定电压的稳压器169.MC79L05ABP：三端负固定电压的稳压器170.MC79L05ABPG：0.1A负压稳压器171.MC79L05ABPRAG：三端负固定电压的稳压器172.MC79L05ACDR2：三端小电流负固定电压的稳压器173.MC79L05ACPG：0.1A负压稳压器174.MC79L12ABPRAG：0.1A负压稳压器175.MC79L12ACDR2：三端小电流负固定电压的稳压器176.MC79L15ACDR2：三端小电流负固定电压的稳压器177.MC79L18ACP：三端小电流负固定电压的稳压器178.MC79L24ACP：三端小电流负固定电压的稳压器179.MC79M05BDTG：0.5A负压稳压器180.MC79M05BDTRKG：0.5A负压稳压器181.MC79M05BT：500mA负输出电压稳压器182.MC79M05CDTRK：三端中电流负固定电压的稳压器183.MC79M08CDTRK：三端中电流负固定电压的稳压器184.MC79M12BT：500mA负输出电压稳压器185.MC79M12CDTG：0.5A负压稳压器186.MC79M12CDTRK：三端中电流负固定电压的稳压器187.MC79M15BDTG：0.5A负压稳压器188.MC79M15BDTRKG：0.5A负压稳压器189.MC79M15BT：三端负固定电压的稳压器190.MC79M15CDTRK：三端中电流负固定电压的稳压器191.MC79M15CTG：0.5A负压稳压器192.NCV7805BTG：1A, 5V, ±4%误差稳压器,193.NCV8141D2TG：5V, 500mA线性稳压器带 ENABLE, /RESET,和看门狗194.可调输出稳压器（标准线性电源）195.LM317BD2TG：可调整的3端正电压稳压器196.LM317BD2TR4G：可调整的3端正电压稳压器197.LM317BTG：可调整的3端正电压稳压器198.LM317D2T：可调整的3端正电压稳压器199.LM317D2TR4：可调整的3端正电压稳压器200.LM317D2TR4G：可调整的3端正电压稳压器201.LM317LBD：可调整的3端正电压稳压器202.LM317LBDR2：可调整的3端正电压稳压器203.LM317LBDR2G：可调整的3端正电压稳压器204.LM317LBZG：可调整的3端正电压稳压器205.LM317LDR2G：可调整的3端正电压稳压器206.LM317LZG：可调整的3端正电压稳压器207.LM317MABDTG：可调整的3端正电压稳压器208.LM317MBDTG：可调整的3端正电压稳压器209.LM317MBDTRKG：可调整的3端正电压稳压器210.LM317MBSTT3G：可调整的3端正电压稳压器211.LM317MBTG：可调整的3端正电压稳压器212.LM317MDT：可调整的3端正电压稳压器213.LM317MDTRK：可调整的3端正电压稳压器214.LM317MDTRKG：可调整的3端正电压稳压器215.LM317MSTT3G：可调整的3端正电压稳压器216.LM317MTG：可调整的3端正电压稳压器217.LM317TG：可调整的3端正电压稳压器218.LM337BD2TG：可调整的3端负电压稳压器219.LM337BD2TR4G：可调整的3端负电压稳压器220.LM337BTG：可调整的3端负电压稳压器221.LM337D2T：可调整的3端负电压稳压器222.LM337D2TG：可调整的3端负电压稳压器223.LM337D2TR4G：可调整的3端负电压稳压器224.LM337TG：可调整的3端负电压稳压器225.NCV317BD2TG：1.5A可调稳压器226.NCV317BD2TR4G：1.5A可调稳压器227.NCV317BTG：1.5A可调稳压器228.可调分流电压稳压器（标准线性电源）229.NCV431AIDMR2G：3端可调精密分流稳压器230.NCV431AIDR2G：3端可调精密分流稳压器231.TL431ACDMR2G：3端可调精密分流稳压器232.TL431ACLPRAG：3端可调精密分流稳压器233.TL431ACLPREG：3端可调精密分流稳压器234.TL431AILPRAG：3端可调精密分流稳压器235.TL431BCDR2G：3端可调精密分流稳压器236.TL431CDR2G：3端可调精密分流稳压器237.TL431IDR2G：3端可调精密分流稳压器。
7805 稳压芯片，7805 芯片介绍
7805 是我们最常用到的稳压芯片了，他的使用方便，用很简单的电
路即可以输入一个直流稳压电源，他的输出电压恰好为5v，刚好是51 系列
单片机运行所需的电压，他有很多的系列如ka7805，ads7805，cw7805 等，
性能有微小的差别，用的最多的还是lm7805。
7805 结构组成是用78/79 系列三端稳压IC 来组成稳压电源所需的外
围元件极少，7805 三端稳压集成电路电路内部还有过流、过热及调整管的保护电路，使用起来可靠、方便，而且价格便宜。
该系列集成稳压IC 型号中的78 或79 后面的数字代表该三端集成稳压电路的输出电压，如7806 表示输出
电压为正6V，7909 表示输出电压为负9V。
因为三端固定集成稳压电路的使用方便，电子制作中经常采用。
在实际应用中，应在三端集成稳压电路上安装足够大的散热器（当然小功率的条件下不用）。
当稳压管温度过高时，稳压性能将变差，甚至损坏。
当制作中需要一个能输出1.5A 以上电流的稳压电源，通常采用几块三端稳压电路并联起来，使其最大输出电流为N 个1.5A，但应用时需注意：并联使用的集成稳压电路应采用同一厂家、同一批号的产品，以保证参数的一致。
78L05引脚图及电路原理图详解7805引脚图7805是常⽤的三端稳压器，⼀般使⽤的是TO-220封装，能提供DC 5V的输出电压，应⽤范围⼴，内含过流和过载保护电路。
带散热⽚时能持续提供1A的电流，如果使⽤外围器件，它还能提供不通的电压和电流。
7805是常⽤的三端稳压器件，顾名思义05就是输出电压为5v，还可以微调，7805输出波纹很⼩。
(1) 集成三端稳压器根据稳定电压的正、负极性分为78×××，79×××系列。
附图给出了正、负稳压的典型电路。
〈正、负稳压7805电路〉(2) 三端稳压器的型号规格和管脚分布。
例如：78M05三端稳压器可输出+5 V、0.5 A的稳定电压;7912三端稳压器可输出 12V、1A的稳定电压。
(3) 外形及管脚分布，如附图1-25所⽰。
由7805，7905，7812组成的特殊的线性稳压电源如图所⽰为⼀种特殊的电源电路。
该电路虽然简单，但可以从两个相同的次级绕组中产⽣出三组直流电压：+5V、-5V和+12V。
其特点是：D2、D3跨接在E2、E3这两组交流电源之间，起着全波整流的作⽤。
7805可调稳压电源电路图7800系列三端稳压集成电路⼴泛⽤于各种电⼦电器电路中⽤作电源稳压，它的输出电压是固定的，但如果对外围电路稍作改动就可以是⼀个不错的连续可调稳压电源，⽤作实验检修之⽤完全可⾏。
制作之前需了解：7800系列三端稳压器按输出电流区分有三种系列，分别是78L00系列最⼤输出电流0.1A；78M00系列最⼤输出电流0.5A；7800系列最⼤输出电流1.5A。
三端稳压器输⼊输出压差要⼤于2V。
7805－7818的最⾼输⼊电压不能超过35V，7820－7824最⾼输⼊电压不能超过40V。
7805制作的5V－12V连续可调稳压电源这⾥选⽤7805制作了⼀个5V～12V连续可调的直流稳压电源实例。
图中R1、R2的取值决定了输出电压的可调范围，按照图⽰取值可在5～12V稳压范围内实现输出电压连续可调。
BM 半导体产品选用指南( 中 文 版 ---- 技 术 篇 )引言: 作为电源管理的IC 设计公司, 我们瞄准LCD 市场和网络通讯市场的需求, 给客户提供完整的电源管理解决方案, 让客户安心, 省心的享受电子终端产品的设计和制造乐趣. 本文为技术简介, 献给工程师朋友, 最开始的合理的设计定型对整机的性能和整机的成本具有决定性影响, 设计完之后采购要大比例的杀价降成本有点迟了, 通常只有牺牲的是品质和性能了, 所以设计选型的时候是最重要的, 所以以此为出发点, 写此文供您参考!1． LDO2． DC/DC3． 其他4． 包装规范LDO由于在各种电子产品中，主控制或相关芯片需要各种各样的供电电压，各种电压转换芯片应运而生。
线性稳压器(由内部的调整电路来完成, 内部没有开关振荡电路)有如下四种：1． 78 系列（或317）。
绝大多数电源管理的芯片产厂家都有，他们的应用广泛，用量大， 价格便宜,缺点是静态电流大,10mA左右,输入输出压差高。
例如7805 需要+7.5V 输入才能稳定的输出5V，电流超过0.75A 时， 芯片需要很大的散热器。
TO252 的贴片7805 是我们的特色。
我们的型号是BM7805AS,是标准1A的,市面上ＣＪ78M05都是０．５Ａ还不到．但是价格敏感，所以特地为数字高频头的５Ｖ供电做了一颗０．７Ａ的ＢＭ７８Ｄ０５，＋１８Ｖ耐压. 2． BIPOLAR LDO （双极型低压差稳压器）。
是为了降低78系列的输入输出压差而发展的。
一般的这种IC 的压差为1.1V~1.2V 左右，静态电流为8-9 mA左右。
按电流分有如下几种（BM 半导体的）：A．BM1117 1A 的输出， 输出有可调的（ADJ），输出从1.25V 基准输出电压起调。
还有输出固定的5.0V , 3.3V , 2.5V , 1.8V 等。
不同于其他公司的产品，BM1117 的输入电压最高可以达+18V ，有些台湾和内地设计的1117 为了价格竞争， 输入电压最大只有+8V， 输出电流只有800mA，当遇到电压突波时，可能会烧毁，给最终的产品（如DVD 和DVB 等）埋下返修率高的隐患。
说明：
ＬＭ７８Ｍ０５系列的三端的积极监管机构在ＴＯ－２２０／Ｄ－ＰＡＫ包几个固定的输出电压，使其在广泛的应用范围非常有用。
特点：
输出电流可达０．５Ａ
输出电压５，６，８，１２，１５，１８，２４Ｖ
过热保护
短路保护
输出晶体管安全工作区（ＳＯＡ）的保护
内部座双字母组合：
典型应用：
图１固定输出稳压器
图２恒流稳压器
注：１要指定一个输出电压，为“ＸＸ”代替电压值。
２虽然没有输出电容是稳定的需要，并改善瞬态响应。
３ＣＩ是必需的，如果稳压器是位于电源滤波器有明显的距离
图３为提高输出电压的电路
图４可调输出稳压器（７至３０Ｖ）
图５０．５至１０Ｖ的稳压器
尺寸以毫米为单位。
78m05温升全文共四篇示例，供读者参考第一篇示例：78m05温升是指由于电子元件78m05在正常工作状态下产生的热量，导致其温度升高的现象。
78m05是一种常用的稳压电源芯片，可以将输入电压稳定为5V输出电压，常用于各种电子设备中。
随着电子设备的不断发展，电子元件的功耗也在不断增加，导致了电子元件在工作过程中产生的热量越来越多。
除了正常工作状态下的热量产生之外，还有一些不良因素会导致78m05的温升问题，如过载、过压、环境温度过高等。
当电子元件产生的热量无法有效散热时，将导致元件的温度不断升高，可能会造成元件工作异常甚至损坏。
对于78m05这种常用的电子元件，了解和控制其温升是非常重要的。
为了有效解决78m05温升的问题，可以采取以下措施：1. 有效散热：在设计电路板时可以在78m05芯片周围设置散热片、散热器等散热装置，增加散热面积，提高散热效率，从而降低温升。
2. 合理布局：在设计电路时可以考虑合理布局各个元件的位置，尽可能减少78m05与其他高功率元件的相互影响，避免热量积聚导致温升过高。
3. 通风降温：保持电子设备的通风良好，使热量能够及时散去，降低78m05的温升。
可以设置风扇、通风孔等设备，提高散热效果。
4. 限制功率：在使用78m05时，应该合理限制其输入电压和输出电流，避免超出其额定功率范围，从而减少温升问题。
5. 温度监测：可以在电路中设置温度传感器，实时监测78m05的温度变化，一旦发现温升过高，可以及时采取措施降温，保护电子元件。
在使用78m05这种常用的电子元件时，要注意其温升问题，采取有效的措施进行解决，从而保证电子设备的正常运行和稳定性。
只有有效控制温升问题，才能更好地发挥电子元件的功能和性能。
【2000字】第二篇示例：78M05是一种稳压器芯片，常用于电子产品中，可以将输入电压稳定在5V。
在工作过程中，78M05会产生一定的温升，即在工作中产生的热量导致芯片温度升高。
1/21January 2004s OUTPUT CURRENT TO 0.5AsOUTPUT VOLTAGES OF 5;6;8;9;12;15;18;20;24Vs THERMAL OVERLOAD PROTECTION s SHORT CIRCUIT PROTECTIONsOUTPUT TRANSITION SOA PROTECTIONDESCRIPTIONThe L78M00series of three-terminal positive regulators is available in TO-220,TO-220FP,DPAK and IPAK packages and with several fixed output voltages,making it useful in a wide range of applications.These regulators can provide local on-card regulation,eliminating the distribution problems associated with single point regulation.Each type employs internal current limiting,thermal shut-down and safe area protection,making it essentially indestructible.If adequate heat sinking is provided,they can deliver over 0.5A output current.Although designed primarily as fixed voltage regulators,these devices can beused with external components to obtainadjustable voltage and currents.L78M00SERIESPOSITIVE VOLTAGEREGULATORSL78M00SERIES2/21ABSOLUTE MAXIMUM RATINGSAbsolute Maximum Ratings are those values beyond which damage to the device may occur.Functional operation under these condition is not implied.THERMAL DATASHEMATIC DIAGRAMSymbol ParameterValue Unit V I DC Input Voltage (for V O =5to 18V)(for V O =20,24V)3540V V I O Output Current Internally Limited mA P D Power DissipationInternally Limited mW T stg Storage Temperature Range-65to +150°C T opOperating Junction Temperature Range0to +150°CSymbol ParameterTO-220TO-220FPDPAK IPAKUnit R thj-case Thermal Resistance Junction-case 358°C/W R thj-ambThermal Resistance Junction-ambient5060100°C/WL78M00SERIES3/21CONNECTION DIAGRAM (top view)ORDERING CODES(*)Available in Tape &Reel with the suffix "-TR".APPLICATION CIRCUITSTYPE TO-220TO-220FP DPAK (*)IPAK OUTPUT VOLTAGE L78M05L78M05CV L78M05CP L78M05CDT L78M05CDT-15V L78M06L78M06CV L78M06CP L78M06CDT L78M06CDT-16V L78M08L78M08CV L78M08CP L78M08CDT L78M08CDT-18V L78M09L78M09CV L78M09CP L78M09CDT L78M09CDT-19V L78M10L78M10CV L78M10CP L78M10CDT L78M10CDT-110V L78M12L78M12CV L78M12CP L78M12CDT L78M12CDT-112V L78M15L78M15CV L78M15CP L78M15CDT L78M15CDT-115V L78M18L78M18CV L78M18CP L78M18CDT L78M18CDT-118VL78M20L78M20CV L78M20CP L78M20CDT L78M20CDT-120V L78M24L78M24CVL78M24CPL78M24CDTL78M24CDT-124VL78M00SERIES4/21TEST CIRCUITS Figure 1:DC ParameterFigure 2:Load RegulationFigure 3:RippleRejectionL78M00SERIES5/21ELECTRICAL CHARACTERISTICS OF L78M05C (refer to the test circuits,T J =25°C,V I =10V,I O =350mA,C I =0.33µF,C O =0.1µF unless otherwise specified).ELECTRICAL CHARACTERISTICS OF L78M06C (refer to the test circuits,T J =25°C,V I =11V,I O =350mA,C I =0.33µF,C O =0.1µF unless otherwise specified).Symbol ParameterTest ConditionsMin.Typ.Max.Unit V O Output Voltage 4.85 5.2V V O Output Voltage I O =5to 350mA V I =7to 20V 4.7555.25V ∆V O Line Regulation V I =7to 25V I O =200mA 100mVV I =8to 25V I O =200mA 50∆V O Load Regulation I O =5to 500mA T J =25°C 100mV I O =5to 200mAT J =25°C50I d Quiescent Current 6mA ∆I dQuiescent Current ChangeI O =5to 350mA 0.5mA I O =200mAV I =8to 25V 0.8∆V O /∆T Output Voltage Drift I O =5mA T J =0to 125°C -0.5mV/°C SVR Supply Voltage Rejection V I =8to 18V f =120HzI O =300mA 62dB eN Output Noise Voltage B =10Hz to 100KHz 40µV V d Dropout Voltage 2V I scShort Circuit CurrentV I =35V300mA Symbol ParameterTest ConditionsMin.Typ.Max.Unit V O Output Voltage 5.756 6.25V V O Output Voltage I O =5to 350mA V I =8to 21V 5.766.3V ∆V O Line Regulation V I =8to 25V I O =200mA 100mVV I =9to 25V I O =200mA 50∆V O Load Regulation I O =5to 500mA T J =25°C 120mV I O =5to 200mAT J =25°C60I d Quiescent Current 6mA ∆I dQuiescent Current ChangeI O =5to 350mA 0.5mA I O =200mAV I =9to 25V 0.8∆V O /∆T Output Voltage Drift I O =5mA T J =0to 125°C -0.5mV/°C SVR Supply Voltage Rejection V I =9to 19V f =120HzI O =300mA 59dB eN Output Noise Voltage B =10Hz to 100KHz 45µV V d Dropout Voltage 2V I scShort Circuit CurrentV I =35V270mAL78M00SERIES6/21ELECTRICAL CHARACTERISTICS OF L78M08C (refer to the test circuits,T J =25°C,V I =14V,I O =350mA,C I =0.33µF,C O =0.1µF unless otherwise specified).ELECTRICAL CHARACTERISTICS OF L78M09C (refer to the test circuits,T J =25°C,V I =15V,I O =350mA,C I =0.33µF,C O =0.1µF unless otherwise specified).Symbol ParameterTest ConditionsMin.Typ.Max.Unit V O Output Voltage 7.788.3V V O Output Voltage I O =5to 350mA V I =10.5to 23V 7.688.4V ∆V O Line Regulation V I =10.5to 25V I O =200mA 100mVV I =11to 25V I O =200mA 50∆V O Load Regulation I O =5to 500mA T J =25°C 160mV I O =5to 200mAT J =25°C80I d Quiescent Current 6mA ∆I dQuiescent Current ChangeI O =5to 350mA 0.5mA I O =200mAV I =10.5to 25V 0.8∆V O /∆T Output Voltage Drift I O =5mAT J =0to 125°C-0.5mV/°C SVR Supply Voltage Rejection V I =11.5to 21.5V f =120Hz I O =300mA 56dB eN Output Noise Voltage B =10Hz to 100KHz 52µV V d Dropout Voltage 2V I scShort Circuit CurrentV I =35V250mA Symbol ParameterTest ConditionsMin.Typ.Max.Unit V O Output Voltage 8.6599.35V V O Output Voltage I O =5to 350mA V I =11.5to 24V 8.5599.45V ∆V O Line Regulation V I =11.5to 25V I O =200mA 100mVV I =12to 25V I O =200mA 50∆V O Load Regulation I O =5to 500mA T J =25°C 180mV I O =5to 200mAT J =25°C90I d Quiescent Current 6mA ∆I dQuiescent Current ChangeI O =5to 350mA 0.5mA I O =200mAV I =11.5to 25V 0.8∆V O /∆T Output Voltage Drift I O =5mA T J =0to 125°C -0.5mV/°C SVR Supply Voltage Rejection V I =12.5to 23V f =120HzI O =300mA 56dB eN Output Noise Voltage B =10Hz to 100KHz 58µV V d Dropout Voltage 2V I scShort Circuit CurrentV I =35V250mAL78M00SERIES7/21ELECTRICAL CHARACTERISTICS OF L78M10C (refer to the test circuits,T J =25°C,V I =16V,I O =350mA,C I =0.33µF,C O =0.1µF unless otherwise specified).ELECTRICAL CHARACTERISTICS OF L78M12C (refer to the test circuits,T J =25°C,V I =19V,I O =350mA,C I =0.33µF,C O =0.1µF unless otherwise specified).Symbol ParameterTest ConditionsMin.Typ.Max.Unit V O Output Voltage 9.61010.4V V O Output Voltage I O =5to 350mA V I =12.5to 25V 9.51010.5V ∆V O Line Regulation V I =12.5to 30V I O =200mA 100mVV I =13to 30V I O =200mA 50∆V O Load Regulation I O =5to 500mA T J =25°C 200mV I O =5to 200mAT J =25°C100I d Quiescent Current 6mA ∆I dQuiescent Current ChangeI O =5to 350mA 0.5mA I O =200mAV I =12.5to 30V 0.8∆V O /∆T Output Voltage Drift I O =5mA T J =0to 125°C -0.5mV/°C SVR Supply Voltage Rejection V I =13.5to 24V f =120HzI O =300mA 56dB eN Output Noise Voltage B =10Hz to 100KHz 64µV V d Dropout Voltage 2V I scShort Circuit CurrentV I =35V245mA Symbol ParameterTest ConditionsMin.Typ.Max.Unit V O Output Voltage 11.51212.5V V O Output Voltage I O =5to 350mA V I =14.5to 27V 11.41212.6V ∆V O Line Regulation V I =14.5to 30V I O =200mA 100mVV I =16to 30V I O =200mA 50∆V O Load Regulation I O =5to 500mA T J =25°C 240mV I O =5to 200mAT J =25°C120I d Quiescent Current 6mA ∆I dQuiescent Current ChangeI O =5to 350mA 0.5mA I O =200mAV I =14.5to 30V 0.8∆V O /∆T Output Voltage Drift I O =5mA T J =0to 125°C -1mV/°C SVR Supply Voltage Rejection V I =15to 25V f =120HzI O =300mA 55dB eN Output Noise Voltage B =10Hz to 100KHz 75µV V d Dropout Voltage 2V I scShort Circuit CurrentV I =35V240mAL78M00SERIES8/21ELECTRICAL CHARACTERISTICS OF L78M15C (refer to the test circuits,T J =25°C,V I =23V,I O =350mA,C I =0.33µF,C O =0.1µF unless otherwise specified).ELECTRICAL CHARACTERISTICS OF L78M18C (refer to the test circuits,T J =25°C,V I =26V,I O =350mA,C I =0.33µF,C O =0.1µF unless otherwise specified).Symbol ParameterTest ConditionsMin.Typ.Max.Unit V O Output Voltage 14.41515.6V V O Output Voltage I O =5to 350mA V I =17.5to 30V 14.251515.75V ∆V O Line Regulation V I =17.5to 30V I O =200mA 100mVV I =20to 30V I O =200mA 50∆V O Load Regulation I O =5to 500mA T J =25°C 300mV I O =5to 200mAT J =25°C150I d Quiescent Current 6mA ∆I dQuiescent Current ChangeI O =5to 350mA 0.5mA I O =200mAV I =17.5to 30V 0.8∆V O /∆T Output Voltage Drift I O =5mAT J =0to 125°C-1mV/°C SVR Supply Voltage Rejection V I =18.5to 28.5V f =120Hz I O =300mA 54dB eN Output Noise Voltage B =10Hz to 100KHz 90µV V d Dropout Voltage 2V I scShort Circuit CurrentV I =35V240mA Symbol ParameterTest ConditionsMin.Typ.Max.Unit V O Output Voltage 17.31818.7V V O Output Voltage I O =5to 350mA V I =20.5to 33V 17.11818.9V ∆V O Line Regulation V I =21to 33V I O =200mA 100mVV I =24to 33V I O =200mA 50∆V O Load Regulation I O =5to 500mA T J =25°C 360mV I O =5to 200mAT J =25°C180I d Quiescent Current 6mA ∆I dQuiescent Current ChangeI O =5to 350mA 0.5mA I O =200mAV I =21to 33V 0.8∆V O /∆T Output Voltage Drift I O =5mA T J =0to 125°C -1.1mV/°C SVR Supply Voltage Rejection V I =22to 32V f =120HzI O =300mA 53dB eN Output Noise Voltage B =10Hz to 100KHz 100µV V d Dropout Voltage 2V I scShort Circuit CurrentV I =35V240mAL78M00SERIES9/21ELECTRICAL CHARACTERISTICS OF L78M20C (refer to the test circuits,T J =25°C,V I =29V,I O =350mA,C I =0.33µF,C O =0.1µF unless otherwise specified).ELECTRICAL CHARACTERISTICS OF L78M24C (refer to the test circuits,T J =25°C,V I =33V,I O =350mA,C I =0.33µF,C O =0.1µF unless otherwise specified),Symbol ParameterTest ConditionsMin.Typ.Max.Unit V O Output Voltage 19.22020.8V V O Output Voltage I O =5to 350mA V I =23to 35V 192021V ∆V O Line Regulation V I =23to 35V I O =200mA 100mVV I =24to 35V I O =200mA 50∆V O Load Regulation I O =5to 500mA T J =25°C 400mV I O =5to 200mAT J =25°C200I d Quiescent Current 6mA ∆I dQuiescent Current ChangeI O =5to 350mA 0.5mA I O =200mAV I =23to 35V 0.8∆V O /∆T Output Voltage Drift I O =5mA T J =0to 125°C -1.1mV/°C SVR Supply Voltage Rejection V I =24to 34V f =120HzI O =300mA 53dB eN Output Noise Voltage B =10Hz to 100KHz 110µV V d Dropout Voltage 2V I scShort Circuit CurrentV I =35V240mA Symbol ParameterTest ConditionsMin.Typ.Max.Unit V O Output Voltage 232425V V O Output Voltage I O =5to 350mA V I =27to 38V 22.82425.2V ∆V O Line Regulation V I =27to 38V I O =200mA 100mVV I =28to 38V I O =200mA 50∆V O Load Regulation I O =5to 500mA T J =25°C 480mV I O =5to 200mAT J =25°C240I d Quiescent Current 6mA ∆I dQuiescent Current ChangeI O =5to 350mA 0.5mA I O =200mAV I =27to 38V 0.8∆V O /∆T Output Voltage Drift I O =5mA T J =0to 125°C -1.2mV/°C SVR Supply Voltage Rejection V I =28to 38V f =120HzI O =300mA 50dB eN Output Noise Voltage B =10Hz to 100KHz 170µV V d Dropout Voltage 2V I scShort Circuit CurrentV I =35V240mAL78M00SERIES10/21Figure 4:Dropout Voltage vs Junction TemperatureFigure 5:Dropout CharacteristicsFigure 6:Peak Output Current vs Input-Output Differential Voltage Figure 7:Output Voltage vs Junction TemperatureFigure 8:Supply Voltage Rejection vs FrequencyFigure 9:Quiescent Current vs JunctionTemperatureFigure10:Load Transient Response Figure11:Line Transient Response Figure12:Quiescent Current vs InputVoltage11/2112/21Figure 13:Fixed Output RegulatorNOTE:1.To specify an output voltage,substitute voltage value for "XX".2.Although no output capacitor is need for stability,it does improve transient response.3.Required if regulator is locate an appreciable distance from power supply filter.Figure 14:Figure 15:13/21Figure 16:Adjustable Output Regulator (7to 30V)Figure 17:0.5to 10V RegulatorFigure 18:High Current Voltage RegulatorFigure 19:High Output Current with ShortCircuit14/21Figure 20:Tracking Voltage RegulatorFigure 21:High Input Voltage CircuitFigure 22:Reducing Power Dissipation with DroppingResistor15/21Figure 23:Power AM Modulator (unity voltage gain,I O ≤ 0.5)NOTE:The circuit performs well up to 100KHz.Figure 24:Adjustable Output Voltage with Temperature CompensationNOTE:Q 2is connected as a diode in order to compensate the variation of the Q 1V BE with the temperature.C allows a slow risetime of the V O.L78M00SERIES Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.The ST logo is a registered trademark of STMicroelectronicsAll other names are the property of their respective owners© 2004 STMicroelectronics - All Rights ReservedSTMicroelectronics GROUP OF COMPANIESAustralia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan - Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States.21/21。
78＊05系列稳压电路简介
78L05是三端稳压集成电路，不是三极管，亦不是稳压管。
该稳压IC一般采用TO-92封装，其最高输入电压为35V，输出电压为5V±5%，最大输出电流为100mA。
▲ 上图所示为78L05的稳压电路原理图。
正常工作时，要求78L05输入端电压至少要比输出端电压高2V。
只有这样，内部的稳压电路才能正常工作，否则输出电压会低于标称值，并且不稳定。
该稳压电路的最大输出电流为100mA，若超出此值，输出的5V电压将显著降低，同时78L05自身也会显著发热。
▲ TO-92封装的78L05外形及引脚排列。
提问者说78L05的输出电压仅有1.7V，这时可以先看看78L05输入端、输出端是否接错了，若输出端与输入端接反，在输入电压不是很高的情况下，不一定会损坏78L05，但是输出电压肯定不是5V。
若引脚未接错，可以再断开负载，让78L05输出端为空载，这时测量一下输出电压，看是否为5V，若此时输出电压变为5V，那就是负载过
重所致。
另外，在78L05带负载工作时，还要看看此时的输入电压是否高于7v，若输入电压过低，亦会导致输出电压达不到5V。
若上述都没问题，那就是78L05损坏了。
▲ TO-220封装的7805的外形及引脚排列。
▲ TO-252封装的78M05的外形及引脚排列。
顺便说一下，现在常用的还有7805和78M05，它们的输出电压也都是5V，区别就是最大输出电流不同，7805的最大输出电流可达1.5A，78M05的最大输出电流为500mA，若78L05的负载电流过大（＞100mA），可以考虑使用7805或78M05。
Rev. 1.0.5Features•Output Current up to 0.5A•Output V oltages of 5, 6, 8, 12, 15, 18, 24V •Thermal Overload Protection •Short Circuit Protection•Output Transistor Safe Operating Area (SOA)ProtectionDescriptionThe MC78MXX/LM78MXX series of three-terminal positive regulators are available in the TO-220/D-PAKpackage with several fixed output voltages making it useful in a wide range of applications.TO-220D-PAK1. Input2. GND3. Output11GNDGNDInternal Block DigramOUTPUT3R1R2GND 21INPUT SERIES PASSELEMENTSOAPROTECTIONCURRENT GENERATOR STARTING CIRCUITREFERENCE VOLTAGEERROR AMPLIFIERTHERMAL PROTECTIONMC78MXX/LM78MXX3-Terminal 0.5A Positive Voltage RegulatorMC78MXX/LM78MXXAbsolute Maximum RatingsNote:1. Thermal resistance test boardSize: 76.2mm * 114.3mm * 1.6mm(1S0P)JEDEC standard: JESD51-3, JESD51-72. Assume no ambient airflowElectrical Characteristics (MC78M05/LM78M05)(Refer to the test circuits, 0 < T J < +125°C, I O =350mA, V I =10V, unless otherwise specified, C I = 0.33µF, C O =0.1µF)Note:3. Load and line regulation are specified at constant junction temperature. Change in V o due to heating effects must be takeninto account separately. Pulse testing with low duty is used.ParameterSymbol Value Unit Input Voltage (for V O = 5V to 18V)(for V O = 24V)V I V I 3540V V Thermal Resistance Junction-Case (Note1)TO-220 (Tc = +25°C)R θJC 2.5°C/W Thermal Resistance Junction-Air (Note1, 2)TO-220 (Ta = +25°C)D-PAK (Ta = +25°C)R θJA 6692°C/W Operating Junction Temperature Range T OPR 0 ~ +150°C Storage Temperature RangeT STG-65 ~ +150°CParameter Symbol ConditionsMin.Typ.Max.UnitOutput VoltageV OT J = +25°C 4.85 5.2V I O = 5mA to 350mA V I = 7V to 20V 4.755 5.25Line Regulation (Note3)∆V O I O = 200mA T J =+25°CV I = 7V to 25V --100mV V I = 8V to 25V--50Load Regulation (Note3)∆V O I O = 5mA to 0.5A, T J =+25°C --100mV I O = 5mA to 200mA, T J =+25 °C --50Quiescent Current I Q T J =+25°C- 4.0 6.0mAQuiescent Current Change∆I Q I O = 5mA to 350mA --0.5mA I O = 200mA V I = 8V to 25V --0.8Output Voltage Drift ∆V/∆T I O = 5mAT J = 0 to +125°C --0.5-mV/°COutput Noise Voltage V N f = 10Hz to 100kHz -40-µV/VoRipple Rejection RR f = 120Hz, I O = 300mA V I = 8V to 18V, T J =+25 °C -80-dB Dropout Voltage V D T J =+25°C, I O = 500mA -2-V Short Circuit Current I SC T J =+25°C, V I = 35V -300-mA Peak CurrentI PKT J =+25°C-700-mAMC78MXX/LM78MXXElectrical Characteristics (MC78M06) (Continued)(Refer to the test circuits, 0 < T J < +125°C, I O =350mA, V I =11V, unless otherwise specified, C I =0.33µF, C O =0.1µF)Note:1. Load and line regulation are specified at constant junction temperature. Change in V o due to heating effects must be takeninto account separately. Pulse testing with low duty is used.Parameter Symbol ConditionsMin.Typ.Max.UnitOutput VoltageV OT J = +25°C 5.756 6.25V I O = 5mA to 350mA V I = 8V to 21V 5.76 6.3Line Regulation (Note1)∆V O I O = 200mA T J = +25°CV I = 8V to 25V --100mV V I = 9V to 25V--50Load Regulation (Note1)∆V O I O = 5mA to 0.5A, T J = +25°C --120mV I O = 5mA to 200mA, T J = +25°C --60Quiescent Current I Q T J = +25°C - 4.0 6.0mAQuiescent Current Change∆I Q I O = 5mA to 350mA --0.5mA I O = 200mA V I = 9V to 25V --0.8Output Voltage Drift ∆V/∆T I O = 5mAT J = 0 to +125°C --0.5-mV/°COutput Noise Voltage V N f = 10Hz to 100kHz -45-µV/VoRipple Rejection RR f = 120Hz, I O = 300mA V I = 9V to 19V, T J =+25 °C -80-dB Dropout Voltage V D T J =+25°C, I O = 500mA -2-V Short Circuit Current I SC T J = +25°C, V I = 35V -300-mA Peak CurrentI PKT J =+25°C-700-mAMC78MXX/LM78MXXElectrical Characteristics (MC78M08) (Continued)(Refer to the test circuits, 0 < T J < +125°C, I O =350mA, V I =14V, unless otherwise specified, C I = 0.33µF, C O =0.1µF)Note:1. Load and line regulation are specified at constant junction temperature. Change in V O due to heating effects must be takeninto account separately. Pulse testing with low duty is used.Parameter SymbolConditionsMin.Typ.Max.UnitOutput VoltageV OT J =+25°C7.788.3V I O = 5mA to 350mA V I = 10.5V to 23V 7.688.4Line Regulation (Note1)∆V O I O = 200mA T J =+25°CV I = 10.5V to 25V --100mV V I = 11V to 25V --50Load Regulation (Note1)∆V O I O = 5mA to 0.5A, T J =+25°C --160mV I O = 5mA to 200mA, T J =+25°C --80Quiescent Current I Q T J = +25°C - 4.0 6.0mAQuiescent Current Change∆I Q I O = 5mA to 350mA --0.5mA I O = 200mAV I = 10.5V to 25V --0.8Output Voltage Drift RR I O = 5mAT J = 0 to +125°C -−0.5-mV/°COutput Noise Voltage V N f = 10Hz to 100kHz-52-µV/VoRipple Rejection RR f = 120Hz, I O = 300mAV I = 11.5V to 21.5V, T J =+25 °C -80-dB Dropout Voltage V D T J = +25°C, I O = 500mA -2-V Short Circuit Current I SC T J = +25°C, V I = 35V -300-mA Peak CurrentI PKT J = +25°C-700-mA(Refer to the test circuits, 0 < T J < +125°C, I O =350mA, V I =19V, unless otherwise specified, C I =0.33µF, C O =0.1µF)Note:1. Load and line regulation are specified at constant junction temperature. Change in V o due to heating effects must be takeninto account separately. Pulse testing with low duty is used.Parameter SymbolConditionsMin.Typ.Max.UnitOutput VoltageV OT J = +25°C11.51212.5V I O = 5mA to 350mA V I = 14.5V to 27V 11.41212.6Line Regulation (Note1)∆V O I O = 200mA T J = +25°CV I = 14.5V to 30V --100mV V I = 16V to 30V --50Load Regulation (Note1)∆V O I O = 5mA to 0.5A, T J = +25°C --240mV I O = 5mA to 200mA, T J = +25°C --120Quiescent Current I Q T J =+25°C- 4.1 6.0mAQuiescent Current Change∆I Q I O = 5mA to 350mA --0.5mA I O = 200mAV I = 14.5V to 30V --0.8Output Voltage Drift ∆V/∆T I O = 5mAT J = 0 to +125°C --0.5-mV/°COutput Noise Voltage V N f = 10Hz to 100kHz-75-µV/VoRipple Rejection RR f = 120Hz, I O = 300mAV I = 15V to 25V, T J =+25 °C -80-dB Dropout Voltage V D T J =+25°C, I O = 500mA -2-V Short Circuit Current I SC T J = +25°C, V I = 35V -300-mA Peak CurrentI PKT J = +25°C-700-mA(Refer to the test circuits, 0 < T J < +125°C, I O =350mA, V I =23V, unless otherwise specified, C I =0.33µF, C O =0.1µF)Note:1. Load and line regulation are specified at constant junction temperature. Change in V O due to heating effects must be takeninto account separately. Pulse testing with low duty is used.Parameter Symbol ConditionsMin.Typ.Max.UnitOutput VoltageV OT J = +25°C 14.41515.6V I O = 5mA to 350mA V I = 17.5V to 30V 14.251515.75Line Regulation (Note1)∆V O I O = 200mA T J =+25°CV I = 17.5V to 30V --100mV V I = 20V to 30V--50Load Regulation (Note1)∆V O I O = 5mA to 0.5A, T J =+25°C --300mV I O = 5mA to 200mA, T J =+25°C --150Quiescent Current I Q T J = +25°C - 4.1 6.0mAQuiescent Current Change∆I Q I O = 5mA to 350mA --0.5mA I O = 200mAV I = 17.5V to 30V --0.8Output Voltage Drift ∆V/∆T I O = 5mAT J = 0 to +125°C --1-mV/°COutput Noise Voltage V N f = 10Hz to 100kHz-100-µV/VoRipple Rejection RR f = 120Hz, I O = 300mAV I = 18.5V to 28.5V, T J =+25 °C -70-dB Dropout Voltage V D T J =+25°C, I O = 500mA -2-V Short Circuit Current I SC T J = +25°C, V I = 35V -300-mA Peak CurrentI PKT J = +25°C-700-mAMC78MXX/LM78MXXElectrical Characteristics (MC78M18) (Continued)(Refer to the test circuits, 0 < T J < +125°C, I O =350mA, V I =26V, unless otherwise specified, C I =0.33µF, C O =0.1µF)Note:1. Load and line regulation are specified at constant junction temperature. Change in V O due to heating effects must be takeninto account separately. Pulse testing with low duty is used.Parameter SymbolConditionsMin.Typ.Max.UnitOutput VoltageV OT J = +25°C17.31818.7V I O = 5mA to 350mA V I = 20.5V to 33V 17.11818.9Line Regulation (Note1)∆V O I O = 200mA T J = +25°CV I = 21V to 33V --100mV V I = 24V to 33V --50Load Regulation (Note1)∆V ΟI O = 5mA to 0.5A, T J = +25°C --360mV I O = 5mA to 200mA, T J = +25°C --180Quiescent Current I Q T J = +25°C - 4.2 6.0mAQuiescent Current Change ∆I Q I O = 5mA to 350mA --0.5mA I O = 200mA V I = 21V to 33V--0.8Output Voltage Drift ∆V/∆T I O = 5mAT J = 0 to 125°C --1.1-mV/°C Output Noise Voltage V N f = 10Hz to 100kHz-100-µV/Vo Ripple Rejection RR f = 120Hz, I O = 300mA , V I = 22V to 32V T J =+25 °C-70-dB Dropout Voltage V D T J = +25°C, I O = 500mA -2-V Short Circuit Current I SC T J = +25°C, V I = 35V -300-mA Peak CurrentI PKT J = +25°C-700-mAElectrical Characteristics (MC78M24) (Continued)(Refer to the test circuits, 0 < T J < +125°C, I O =350mA, V I =33V, unless otherwise specified, C I =0.33µF, C O =0.1µF)Note:1. Load and line regulation are specified at constant junction temperature. Change in V O due to heating effects must be takeninto account separately. Pulse testing with low duty is used.Parameter Symbol ConditionsMin.Typ.Max.UnitOutput VoltageV OT J =+25°C 232425V I O = 5mA to 350mA V I = 27V to 38V22.82425.2Line Regulation (Note1)∆V O I O = 200mA T J =+25°C V I = 27V to 38V --100mV V I = 28V to 38V --50Load Regulation (Note1)∆V O I O = 5mA to 0.5A, T J =+25°C --480mV I O = 5mA to 200mA, T J =+25°C --240Quiescent CurrentI QT J = +25°C - 4.2 6.0mAQuiescent Current Change∆I Q I O = 5mA to 350mA--0.5mA I O = 200mA V I = 27V to 38V --0.8Output Voltage Drift ∆V/∆T I O = 5mAT J = 0 to +125°C --1.2-mV/°COutput Noise Voltage V N f = 10Hz to 100kHz-170-µV/VoRipple Rejection RR f = 120Hz, I O = 300mAV I = 28V to 38V, T J =+25 °C -70-dB Dropout Voltage V D T J = +25°C, I O = 500mA -2-V Short Circuit Current I SC T J = +25°C, V I = 35V -300-mA Peak CurrentI PKT J = +25°C-700-mATypical ApplicationsFigure 1.Fixed Output RegulatorFigure 2.Constant Current RegulatorNotes:1.To specify an output voltage, substitute voltage value for "XX"2.Although no output capacitor is needed for stability, it does improve transient response.3.C I is required if regulator is located an appreciable distance from power Supply filterFigure 3.Circuit for Increasing Output Voltage0.1µFC OC I0.3µFV OV IMC78MXX LM78MXX1320.1µFC OC I0.33µFI OV IMC78MXX LM78MXX132VXXI O R 1I O = R 1 +I OVxx 0.1µFC OC I0.33µFI OV IMC78MXX LM78MXX132V XXV OR 1R 2I R1 ≥ 5I OV O = V XX (1+R 2/R 1) +I O R 2MC78MXX/LM78MXXFigure 4.Adjustable Output Regulator (7 to 30V)Figure 5.0.5 to 10V Regulator0.1µFC OC I0.33µFV OV IMC78M05LM78M0513210k Ω32476LM7410.1µFC2C10.33µFV OV IMC78M05LM78M0513210k Ω32476LM741R3R1VXXR4R5910Ω9.1k Ω13V < V I < 25V-7 < -VI < 17V_+VO = VxxR 1R 4Mechanical DimensionsPackageDimensions in millimetersTO-22011Mechanical Dimensions (Continued)PackageDimensions in millimetersD-PAK1213Ordering InformationProduct Number Package Operating TemperatureLM78M05CT TO-2200 ~ +125°C Product Number PackageOperating TemperatureMC78M05CT TO-2200 ~ +125°CMC78M06CT MC78M08CT MC78M12CT MC78M15CT MC78M18CT MC78M24CT MC78M05CDT D-PAKMC78M06CDT MC78M08CDT MC78M12CDT11/12/02 0.0m 001Stock#DSxxxxxxxx2002 Fairchild Semiconductor CorporationLIFE SUPPORT POLICYFAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein:1.Life support devices or systems are devices or systemswhich, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can bereasonably expected to result in a significant injury of the user.2. A critical component in any component of a life supportdevice or system whose failure to perform can bereasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.DISCLAIMERFAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANYLIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.。
