多路输出式DC-DC变换器的制作和功能毕业论文.doc

6多路输出式DC/DC变换器的制作摘要1摘要随着集成电路和超大规模集成电路的快速发展，特别是微处理器和半导体存储器的开发利用，孕育了电子系统的新一代产品。很显然，体积大而笨重的使用工频变压器的线性调节稳压电源已经过时，取而代之的是小型化、重量轻、效率高的新型开关电源。本文中，主要以美国国家半导体公司（NationalSemiconductor）出品的单片式降压稳压器LM2673为例介绍了多路输出式DC/DC变换器的制作和一些功能，并使用了CAD软件Protel99进行了基于LM2673的降压式电源变换器模块电路的简单设计和PCB制作。关键词：LM2673多路输出式DC/DC变换器降压式开关稳压器PROTEL2AbstractWithhigh-speeddevelopmentsoftheIntegratedCircuitandGrandScaleIntegratedCircuit,especiallythedevelopmentsandapplicationsofMPUandsemiconductormemory,wedevisemanynewproductsinelectronicssystem.Toallappearances,thelinear-regulatedpowersupplywhichusebigandheavyoperatingfrequencytransformerhasbeenout-of-date.Italreadyhavebeenreplacedbythenewpowersupplywhichhasminiaturization,lightweightandhighefficiency.Inthisarticle,weintroducedthesimpleswitcherstep-downvoltageregulatorLM2673（NationalSemiconductor）forexample.Sowecanknowsomethingsaboutmultiple-outputDC/DCmapper.wealsousedtheCADsoftwareProtel99todesignthesimpleplanandPCBofsimplemodulecircuitonthebasisofLM2673.KeyWords：LM2673Multiple-OutputDC/DCMapperStep-DownVoltageRegulatorPROTEL2目录TOC\o"1-3"\h\z\uHYPERLINK\l"_Toc170400560"摘要PAGEREF_Toc170400560\h1HYPERLINK\l"_Toc170400561"AbstractPAGEREF_Toc170400561\h3HYPERLINK\l"_Toc170400562"目录PAGEREF_Toc170400562\h5HYPERLINK\l"_Toc170400563"引言PAGEREF_Toc170400563\h7HYPERLINK\l"_Toc170400564"第一章多路输出式单片电源开关的原理与应用PAGEREF_Toc170400564\h9HYPERLINK\l"_Toc170400565"1.1降压式DC/DC电源变换器的原理与应用PAGEREF_Toc170400565\h9HYPERLINK\l"_Toc170400566"1.1.1降压式DC/DC变换器的基本原理PAGEREF_Toc170400566\h9HYPERLINK\l"_Toc170400567"1.1.2LM2673降压式模块的应用PAGEREF_Toc170400567\h10HYPERLINK\l"_Toc170400568"1.2开关电源的输入电路PAGEREF_Toc170400568\h12HYPERLINK\l"_Toc170400569"1.2.1输入整流器PAGEREF_Toc170400569\h12HYPERLINK\l"_Toc170400570"1.2.2输入滤波电容PAGEREF_Toc170400570\h13HYPERLINK\l"_Toc170400572"1.3开关电源的输出电路PAGEREF_Toc170400572\h15HYPERLINK\l"_Toc170400573"1.3.1整流输出和滤波电路PAGEREF_Toc170400573\h15HYPERLINK\l"_Toc170400574"1.3.2功率整流器的特点PAGEREF_Toc1