ICE2QS03G芯片36W开关电源设计总结

ApplicationNote,V1.1,22June2011Neverstopthinking.PowerManagement&SupplyApplicationNoteAN-EVALQRS-ICE2QS03G36WEvaluationBoardwithQuasi-ResonantPWMControllerICE2QS03GPublishedbyInfineonTechnologiesAG81726Munich,Germany©2007InfineonTechnologiesAGAllRightsReserved.LegalDisclaimerTheinformationgiveninthisdocumentshallinnoeventberegardedasaguaranteeofconditionsorcharacteristics.Withrespecttoanyexamplesorhintsgivenherein,anytypicalvaluesstatedhereinand/oranyinformationregardingtheapplicationofthedevice,InfineonTechnologiesherebydisclaimsanyandallwarrantiesandliabilitiesofanykind,includingwithoutlimitation,warrantiesofnon-infringementofintellectualpropertyrightsofanythirdparty.InformationForfurtherinformationontechnology,deliverytermsandconditionsandprices,pleasecontactthenearestInfineonTechnologiesOffice().WarningsDuetotechnicalrequirements,componentsmaycontaindangeroussubstances.Forinformationonthetypesinquestion,pleasecontactthenearestInfineonTechnologiesOffice.InfineonTechnologiescomponentsmaybeusedinlife-supportdevicesorsystemsonlywiththeexpresswrittenapprovalofInfineonTechnologies,ifafailureofsuchcomponentscanreasonablybeexpectedtocausethefailureofthatlife-supportdeviceorsystemortoaffectthesafetyoreffectivenessofthatdeviceorsystem.Lifesupportdevicesorsystemsareintendedtobeimplantedinthehumanbodyortosupportand/ormaintainandsustainand/orprotecthumanlife.Iftheyfail,itisreasonabletoassumethatthehealthoftheuserorotherpersonsmaybeendangered.TitleRevisionHistory:22June2011V1.1PreviousVersion:V1.0PageSubjects(majorchangessincelastrevision)11,12,13ReviseBOM,transformerdrawing36WEvaluationBoardwithQuasi-ResonantPWMControllerICE2QS03GLicens[e-mail]@[e-mail]@infineon.comWeListentoYourCommentsAnyinformationwithinthisdocumentthatyoufeeliswrong,unclearormissingatall?Yourfeedbackwillhelpustocontinuouslyimprovethequalityofthisdocument.Pleasesendyourproposal(includingareferencetothisdocument)to:[e-mail]-36W-ICE2QS03GApplicationNote22June20114TableofContents1Content.................................................................................................................52EvaluationBoard.................................................................................................53ListofFeatures....................................................................................................54TechnicalSpecifications.....................................................................................55CircuitDescription..............................................................................................65.1MainsInputandRectification....................................................................................................65.2PWMControl...............................................................................................................................65.3SnubberNetwork........................................................................................................................65.4OutputStage...............................................................................................................................65.5FeedbackLoop...........................................................................................................................66CircuitOperation.................................................................................................66.1StartupOperation.......................................................................................................................66.2NormalModeOperation.............................................................................................................76.3DigitalFrequencyReduction.....................................................................................................77ProtectionFeatures.............................................................................................77.1Vccundervoltageprotection....................................................................................................77.2Foldbackpointprotection..........................................................................................................77.3Openloop/overloadprotection.................................................................................................77.4Adjustableoutputovervoltageprotection................................................................................77.5Shortwindingprotection...........................................................................................................78Circuitdiagram....................................................................................................88.1PCBTopoverlayer......................................................................................................................98.2PCBBottomLayer.................................................