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8.8W可调光、非隔离、降压式LED驱动器.pdf

8.8W可调光、非隔离、降压式LED驱动器.pdf

上传者: wang0854 2014-03-31 评分1 评论0 下载0 收藏10 阅读量362 暂无简介 简介 举报

简介:本文档为《8.8W可调光、非隔离、降压式LED驱动器pdf》,可适用于电子通讯领域,主题内容包含PowerIntegrationsHellyerAvenue,SanJose,CAUSATel:Fax:wwwpowerintcomDesignEx符等。

PowerIntegrationsHellyerAvenue,SanJose,CAUSATel:Fax:wwwpowerintcomDesignExampleReportTitleWHighEfficiency(>)HighPowerFactor(>)TRIACDimmableNonIsolatedBuckLEDDriverUsingLYTSwitchTMLYTESpecificationVAC–VACInputVTYP,mAOutputApplicationPARLEDDriverAuthorApplicationsEngineeringDepartmentDocumentNumberDERDateDecember,RevisionSummaryandFeaturesEfficiency>atVACTRIACdimmableWorkswithawideselectionofTRIACdimmersLowcost,lowcomponentcount,smallPCBFaststartuptime(<ms)–noperceptibledelayIntegratedprotectionandreliabilityfeaturesOutputshortcircuitprotectedwithautorecoveryAutorecoveringthermalshutdownwithlargehysteresisNodamageduringbrownoutconditionsPF>atVACATHD<atVACMeetsENconductedEMIPATENTINFORMATIONTheproductsandapplicationsillustratedherein(includingtransformerconstructionandcircuitsexternaltotheproducts)maybecoveredbyoneormoreUSandforeignpatents,orpotentiallybypendingUSandforeignpatentapplicationsassignedtoPowerIntegrationsAcompletelistofPowerIntegrations'patentsmaybefoundatwwwpowerintcomPowerIntegrationsgrantsitscustomersalicenseundercertainpatentrightsassetforthat<http:wwwpowerintcomiphtm>DERWPARHLODimmableLEDDriverUsingLYTEDecPageofPowerIntegrations,IncTel:Fax:wwwpowerintcomTableofContents Introduction  PowerSupplySpecification  Schematic  CircuitDescription  InputEMIFiltering  PowerCircuit  BiasSupplyandOutputFeedback  TRIACPhaseDimmingControlCompatibility  PCBLayout  BillofMaterials  InductorSpecification  ElectricalDiagram  ElectricalSpecifications  Materials  InductorBuildDiagram  InductorConstruction  PerformanceData  Efficiency  LineandLoadRegulation  PowerFactor  ATHD  Harmonics  TestData  TestData,VLEDLoad  TestData,VLEDLoad  TestData,VLEDLoad  TestData,VLEDLoad  DimmingPerformanceData  DimmingCurvewithLeadingEdgeTypeDimmer  DimmerCompatibilityList  ThermalPerformance  NonDimmingVLED=VLEDLoad  DimmingVLED=VLEDLoad  NonDimmingWaveforms  InputVoltageandInputCurrentWaveforms  OutputCurrentandOutputVoltageatNormalOperation  InputVoltageandOutputCurrentWaveformatStartup  DrainVoltageandCurrentatNormalOperation  StartupDrainVoltageandCurrent  DrainCurrentandDrainVoltageDuringOutputShortCondition  OutputDiodeCurrentandVoltageWaveforms  Brownout  DimmingWaveforms  InputVoltageandInputCurrentWaveforms DecDERWPARHLODimmableLEDDriverUsingLYTEPageofPowerIntegrationsTel:Fax:wwwpowerintcom ConductedEMI  TestSetup  LineSurgeTest  RevisionHistory ImportantNote:Althoughthisboardisdesignedtosatisfysafetyisolationrequirements,theengineeringprototypehasnotbeenagencyapprovedTherefore,alltestingshouldbeperformedusinganisolationtransformertoprovidetheACinputtotheprototypeboardDERWPARHLODimmableLEDDriverUsingLYTEDecPageofPowerIntegrations,IncTel:Fax:wwwpowerintcomIntroductionThedocumentdescribesanonisolated,highpowerfactor(PF),highefficiency,TRIACdimmableLEDdriverdesignedtodriveanominalLEDstringvoltageofVatmAfromaninputvoltagerangeofVACtoVAC(Hztypical)Thetopologyusedisasinglestagenonisolatedbuckthatmeetshighpowerfactor,constantcurrentoutputandwhichprovidesdimmingThisdocumentcontainstheLEDdriverspecification,schematic,PCBinformation,billofmaterials,transformerdocumentationandtypicalperformancecharacteristicsFigure–PopulatedCircuitBoard,TopViewDecDERWPARHLODimmableLEDDriverUsingLYTEPageofPowerIntegrationsTel:Fax:wwwpowerintcomFigure–PopulatedCircuitBoard,BottomViewDERWPARHLODimmableLEDDriverUsingLYTEDecPageofPowerIntegrations,IncTel:Fax:wwwpowerintcomPowerSupplySpecificationThetablebelowrepresentstheminimumacceptableperformanceofthedesignActualperformanceislistedintheresultssectionDescriptionSymbolMinTypMaxUnitsCommentInputVoltageVINVACWire–noPEFrequencyfLINEHzOutputOutputVoltageVOUTVOutputCurrentIOUTmAVOUT=V,VIN=VAC,CTotalOutputPowerContinuousOutputPowerPOUTWEfficiencyFullLoadMeasuredatPOUTCEnvironmentalConductedEMICISPRBENBSafetyNonIsolatedRingWave(kHz)DifferentialMode(LL)Commonmode(LLPE)DifferentialSurgekVVPowerFactorMeasuredatVOUT(TYP),IOUT(TYP)andVAC,HzHarmonicCurrentsENClassCAmbientTemperatureTAMBCDecDERWPARHLODimmableLEDDriverUsingLYTEPageofPowerIntegrationsTel:Fax:wwwpowerintcomSchematicFigure–SchematicDERWPARHLODimmableLEDDriverUsingLYTEDecPageofPowerIntegrations,IncTel:Fax:wwwpowerintcomCircuitDescriptionTheLYTE(U)isahighlyintegratedprimarysidecontrollerdesignedforuseinLEDapplicationsItprovideshighpowerfactorwhileregulatingtheoutputcurrentacrossarangeofinputvoltage(VACtoVAC)inasingleconversionstageAllofthecontrolcircuitryresponsibleforthesefunctionsplusthehighvoltagepowerMOSFETisincorporatedintotheICInputEMIFilteringFuseFRprovidesprotectionfromcomponentfailureandprovidesextradampingduringdimmingMOVRVprovidesaclamptolimitvoltageduringdifferentiallinesurgeeventsBridgerectifierBRrectifiestheAClinevoltageEMIfilteringisprovidedbyafilterwhichconsistsofaninductor(L)andcapacitorsCandCPowerCircuitThetopologychoseninthisdesignisalowsidebuckconfiguredtoprovidehighefficiencywithsmallmagnetics,lowTHD,highpowerfactor,andconstantcurrentoutputfortheinputvoltagerangeofVACtoVACInductorTisthemaininductorofthebuckconverterItconsistsoftwowindingstheprimaryandthebiaswindingTheprimarywindingisthemainbuckinductorThebiaswindingisthesupplyfortheICandhelpspreventflickerandshimmerduringdeepdimmingForTRIACdimming,abiassupplyofatleastVsupplyisrequiredThisrequirementensuresadequatevoltagetosupplytheICattheminimumLEDstringvoltageandwithaTRIACdimmeroperatesatminimumconductionangle(<degrees)OutputdiodeDconductseverytimeUturnsoff,allowingstoredenergyinTtotransfertotheloadDiodeDisnecessarytopreventreversecurrentfromflowingbackthroughUwhenthevoltageacrossC(rectifiedinputAC)fallsbelowtheoutputvoltageToprovidepeaklinevoltageinformationtoU,theincomingrectifiedACpeakchargesCviaDThisisthenfedintotheVOLTAGEMONITOR(V)pinofUasacurrentviaRandRResistorRisadischargepathforCtoallowVpintorespondquicklywhenthereisalinesagThelineovervoltageshutdownfunction,sensedviatheVpin,extendstherectifiedlinevoltagewithstand(duringsurgesandlineswells)totheBVDSSratingoftheinternalpowerMOSFETThefastactinglineovervoltagedetectionofLYTSwitchinconjunctionwithDandCpeakdetectorcapacitorprovidesaclamptolimitthemaximumvoltagestressacrossthepowerMOSFEToftheICduringlinesurgeeventAvalueofFonCcanwithstandVsurges,whileFcanwithstandkVsurgeAnadditionalVACratedMOV(MetalOxideVaristor)canbeusedfor>kVdifferentiallinesurgerequirementDecDERWPARHLODimmableLEDDriverUsingLYTEPageofPowerIntegrationsTel:Fax:wwwpowerintcomCapacitorCprovideslocaldecouplingfortheBYPASS(BP)pinofUwhichisthesupplypinfortheinternalcontrollerDuringstartup,Cischargedto~VfromaninternalhighvoltagecurrentsourceconnectedtotheDRAIN(D)pinofUTheuseofanexternalbiassupply(viaDandR)isrecommendedtogivethelowestdevicedissipationandprovidesufficientsupplytoUduringdeepdimmingconditionCapacitorCwaschosentobeFsinceLYTEhasonlyonepowermodeAvalueofkresistorwasusedfortheREFERENCE(R)pin(R)andM(RR)ontheVpintoprovidealinearrelationshipbetweeninputvoltageandtheoutputcurrentOutputcapacitorCistheoutputfiltercapacitorPreloadresistorRcausestheoutputtoquicklydischargebelowtheLEDstringvoltagewhentheACisremovedandensuringthatthelampisextinguished(ratherthantherebeingaslightglowforseveralsecondsafterACisremoved)BiasSupplyandOutputFeedbackAbiaswindingonTisusedtoprovidefeedbackandsupplytotheICThebiaswindingvoltageisusedtosensetheoutputvoltageindirectly,eliminatingsecondarysidefeedbackcomponentsThevoltageonthebiaswindingisproportionaltotheoutputvoltage(setbytheturnratiobetweenthebiasandprimarywindings)TheflybackvoltageonthebiaswindingisrectifiedbyDandfilteredbyCtosmooththevoltageandRtoreduceexcessvoltagecoupledfromtheleakageinductanceenergyThefeedbackcurrentisthenfedtotheFEEDBACK(FB)pinthruresistorRDiodeDandRlinktheBPpintothebiaswindingDiodeDisnecessarytoisolatethevoltagepotentialoftheBPfrominhibitingautorestartfunctionduringstartuporinashortcircuitconditionResistorRlimitsthecurrentsuppliedtotheBPpinfromthebiaswindingTheinternalenginewithinUcombinestheFBpincurrent,theVpincurrent,andinternaldraincurrentinformationtoprovideaconstantoutputcurrentwhilstmaintaininghighinputpowerfactorTRIACPhaseDimmingControlCompatibilityTherequirementtoprovideoutputdimmingwithlowcost,TRIACbased,leadingedgeandtrailingedgephasedimmersintroducedanumberoftradeoffswiththedesignDuetothemuchlowerpowerconsumedbyLEDbasedlighting,thecurrentdrawnbythelampisbelowtheholdingcurrentoftheTRIACinmanydimmersThiscausesundesirablebehaviorsuchaslimiteddimrangeandorflickeringwhentheTRIACfiresinconsistentlyTherelativelylargeimpedancepresentedtothelinebytheLEDcouldcausesignificantringingtooccurduetotheinrushcurrentchargingtheinputcapacitancewhentheTRIACturnsonThiseffectcancauseshimmerastheringingmaycausetheTRIACcurrenttofalltozeroandturnoffThedamper,bleeder,andlinearregulatorcircuitemployedinthedesignovercometheseissueswithminimalimpactonefficiencyofthedriverDERWPARHLODimmableLEDDriverUsingLYTEDecPageofPowerIntegrations,IncTel:Fax:wwwpowerintcomThePIproprietaryactivedamperconsistsofmaincomponentsD,R,R,VR,R,Q,C,Q,Q,R,R,RandRWhereQisfullyonwhenthereisnoTRIACconnected,bypassingRwhichwillkeepthepowerdissipationlowtherebymakingthesystemefficiencyhighATRIACisdetectedthroughC,RandRwhichwillmomentarilydriveQon,keepingCgroundedandthegateofQlowallowingRtobeinserieswiththeTRIACtoactasdampingelement(currentringing)everytimetheTRIACturnsonThepassivebleedernetworkcomprisescapacitorCandresistorRThisnetworkdampstheinputandasoprovidestherequiredlatchingandholdingcurrentfortheTRIACdimmerThelinearregulatorcircuitR,R,VR,Q,andDwereaddedtokeepthesupplyoftheIC(BPpin)constantallowingittooperatenormallyatverylowconductionangleorwithverylowinputvoltageandmakingtheICactasaload(vitalforTRIACswithhighleakagecurrent)Mosthighpowerrated(>W)TRIACdimmershaveanLCinputfilterIftheTRIACfiltercapacitanceislargeenoughtoprovidesufficientenergytochargetheinputstageoftheLEDdriver,theLEDmayturnonastheLEDloadisenergizeduntiltheinputisdischargedThecyclethenrepeatsandcausesflickeringoftheLEDloadeveniftheTRIACisoffThelinearregulatorisnotactivatedwhenthebiasvoltageishigherthanVzVRVtQVfDVoltageregulatorVRischosensuchthatthelinearregulatorwillonlyworkduringdeepdimmingwhenthebiasvoltageissufficientlylow,thisistominimizeQpowerdissipationDecDERWPARHLODimmableLEDDriverUsingLYTEPageofPowerIntegrationsTel:Fax:wwwpowerintcomPCBLayoutFigure–TopSideDERWPARHLODimmableLEDDriverUsingLYTEDecPageofPowerIntegrations,IncTel:Fax:wwwpowerintcomFigure–BottomSideDecDERWPARHLODimmableLEDDriverUsingLYTEPageofPowerIntegrationsTel:Fax:wwwpowerintcomBillofMaterialsItemQtyRefDesDescriptionMfgPartNumberMfgBRV,A,BridgeRectifier,SMD,MBS,SOICBSGComchipTechnologyCnF,V,FilmMEXXFJJDuratechCpF,V,Ceramic,NPO,CCMDGACTUKemetCnF,V,Ceramic,XR,CCKRXRBBYageoCnFV,Ceramic,XR,CCKRACTUKemetCnF,V,FilmECQEKFPanasonicCnF,V,FilmMEXXDJJDuratechCF,V,Electrolytic,(x)TABGMRELtecCF,V,Ceramic,XR,CCKPACTUKemetCF,V,Electrolytic,(x)UPWHMDDNichiconCF,V,Electrolytic,(x)UVYAMPDNichiconDV,A,FastSwitching,ns,SODBAVWSFDiodes,IncDV,A,Rectifier,GlassPassivated,POWERDIDFLRDiodes,IncDDIODEULTRAFAST,SW,V,A,SMAUSDFDiodes,IncDDIODEULTRAFAST,GPP,V,ASMAUSGFDiodes,IncDV,A,Fast

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