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开关电源小信号分析方法（完整版）实用资料(可以直接使用，可编辑完整版实用资料，欢迎下载）WhyisitImportanttoPlotaPowerStageSmall-SignalResponse?ChristopheBasso,ONSemiconductor|PowerElectronicsSep.16,2021ChristopheBassoisanApplicationEngineeringDirectoratONSemiconductorinToulouse,France,whereheleadsanapplicationteamdedicatedtodevelopingnewofflinecontrollersspecifications.HehasoriginatednumerousintegratedcircuitsamongwhichtheNCP120Xserieshassetnewstandardsforlowstandbypowerconverters.ReadmoreaboutChristopheattheendofthisarticle.QUESTION:WhyisitImportanttoPlotaPowerStageSmall-SignalResponse?ANSWER:Thisisthefirstquestionyoumustaskifyouareseriousaboutcompensatingapowersupply.Toooften,Ihaveseenengineersbuildingaprototypeandthrowingarbitrarily-selectedcomponentvaluesattheerroramplifier,hopingitwouldletthepowersupplyatleaststabilizeafterstartup.Then,bytweakingcompensatingcomponentsvalueson-the-flyastheoutputundergoesatransientstep,thepowersupplyismoreorlessstabilizedbytamingundershootsandringingportions.Afewprototypeslater,thedesignisvalidatedforpilotrunandherewegoformassproduction!ThisisascenariothatIhaveseenmanytimeswhilevisitingpowersupplydesignersasanapplicationengineerforONSemi.Eveniftrialsanderrorsmustabsolutelybebannedwhenitcomesdowntoloopcontrol,Icannotblamethesegentlemenfortheirmethod.Thereasonissimple,99%percentofanengineer’stimeisspentonsafetytests,makingsuretheconverterdiespeacefully,withoutsmoke–sometimeswithoutnoise!–whenresistanceR236isopenorshortcircuitedorwhenthecontrollerpin1isshortedtopin2orevenworse,toanyoftheotherpins,includinghighvoltageones!Believeme,testingandsolvingforsafetyisanextremelylongandtediousexercise,furthermoreifextremecostandtimepressureexists.Ifyouoverlookimportantpartsofthedesign(safetylimits,stabilitymarginsandsoon…nowonderthetelephoneringsafewmonthslater,askingthedesignengineertourgentlyflytotheremotefactoryasmostofpowersuppliesdonotpassthesimplestart-upsequence:theovershoottripstheOverVoltageProtection(OVPcircuitandtheconvertersafelylatchesoff.Themoneythecompanybelieved
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