FAN6920MR

September2010©2010FairchildSemiconductorCorporation•Rev.1.0.2FAN6920MR—IntegratedCritical-ModePFCandQuasi-ResonantCurrent-ModePWMControllerFAN6920MRIntegratedCritical-ModePFCandQuasi-ResonantCurrent-ModePWMControllerFeaturesƒIntegratedPFCandFlybackControllerƒCritical-ModePFCControllerƒZero-CurrentDetectionforPFCStageƒQuasi-ResonantOperationforPWMStageƒInternalMinimum5µstOFFforQRPWMStageƒInternal5msSoft-StartforPWMƒBrownoutProtectionƒHigh/LowLineOver-PowerCompensationƒAuto-RecoveryOver-CurrentProtectionƒAuto-RecoveryOpen-LoopProtectionƒExternallyAuto-RecoveryTriggering(RTPin)ƒAdjustableOver-TemperatureProtectionƒVDDPinandOutputVoltageOVP(Auto-Recovery)ƒInternalOver-TemperatureShutdown(140°C)ApplicationsƒAC/DCNBAdaptersƒOpen-FrameSMPSƒBatteryChargerDescriptionThehighlyintegratedFAN6920MRcombinesPowerFactorCorrection(PFC)controllerandquasi-resonantPWMcontroller.Integrationprovidescost-effectivedesignandreducesexternalcomponents.ForPFC,FAN6920MRusesacontrolledon-timetechniquetoprovidearegulatedDCoutputvoltageandtoperformnaturalpower-factorcorrection.WithaninnovativeTHDoptimizer,FAN6920MRcanreduceinputcurrentdistortionatzero-crossingdurationtoimproveTHDperformance.ForPWM,FAN6920MRprovidesseveralfunctionstoenhancethepowersystemperformance:valleydetection,green-modeoperation,andhigh/lowlineover-powercompensation.Protectionfunctionsincludesecondary-sideopen-loopandover-currentwithauto-recoveryprotection;externalauto-recoverytriggering;adjustableover-temperatureprotectionbyRTpin;andexternalNTCresistor,internalover-temperatureshutdown,VDDpinOVP,andDETpinover-voltageforoutputOVP,andbrown-in/outforACinputvoltageUVP.TheFAN6920MRcontrollerisavailableina16-pinsmall-outlinepackage(SOP).OrderingInformationPartNumberOLPModeOperatingTemperatureRangePackagePackingMethodFAN6920MRMYRecovery-40°Cto+105°C16-PinSmallOutlinePackage(SOP)Tape&Reel©2010FairchildSemiconductorCorporation•Rev.1.0.22FAN6920MR—IntegratedCritical-ModePFCandQuasi-ResonantCurrent-ModeFlybackPWMControllerApplicationDiagramFigure1.TypicalApplicationCircuit©2010FairchildSemiconductorCorporation•Rev.1.0.23FAN6920MR—IntegratedCritical-ModePFCandQuasi-ResonantCurrent-ModeFlybackPWMControllerInternalBlockDiagramCSPWM2167341151091213186140.7V0.7V2.5VINV2.3VCOMP0.45VCSPFCBlankingCircuit0.82VSawtoothGeneratorton-maxTHDOptimizerMulti-VectorAmp.ZCDOPFCDRVDRVGND10VIZCD2.1V/1.75VInhibitTimerPFCZero-CurrentDetectorVDDTwo-StepUVLO12V/7V/5VInternalBiasAuto-RecoveryOVPUVPDisableFunction0.2VRestarterPFCCurrentLimit15.5VAuto-Recovery17.5VOPWMDETFBRTVINHVRANGEIHVDebounce2.4V/2.25VPFCRANGEControl1V/1.2VAuto-Recovery2.75V2.65V2.75VRANGE2.9VRANGE4.2V2RRDebounceTime100µASoft-Start5msPWMCurrentLimitIDETInternalOTPAuto-Recovery100µs10ms0.8V0.5VIRTProg.OTP/ExternallyTriggeringBlankingCircuitIDET5VAuto-Recovery(RTPin)Prog.OTPBrownoutSETCLRSRSETCLRSRVB&ClampVcompto1.6VFBOLPTimer50msVBOver-PowerCompensationPFCBurstModeVCTRL-PFCStarter2.25ms28µs15NC2.3V/0.8VVINV27.5VOVP1.2VVINVStart-UpVINICOMP-BURSTS/HDETOVP2.5VtOFFBlanking(2.5µs)VDETAuto-RecoveryValleyDetector(30µA)IDET1stValleytOFF-MIN+9µsPWM-ON/OFFDebounce100mSBrownoutComparatorCOMP-HVCOMP-HAuto-RecoveryProtectionBrownoutProtection(RTPin)ExternallyTriggeringDETPinOVPVDDPinOVPInternalOTPDebounceDebounce70µs5VPFCBurstModeVCOMP-HVINVCOMP-LCOMP-HCOMP-LVCOMP-LtOFF-MIN(5µs/20.5µs/2.25ms)Auto-RecoveryFigure2.FunctionalBlockDiagram©2010FairchildSemiconductorCorporation•Rev.1.0.24FAN6920MR—IntegratedCritical-ModePFCandQuasi-ResonantCurrent-ModeFlybackPWMControllerMarkingInformationFigure3.MarkingDiagramPinConfigurationFigure4.PinConfigurationPinDefinitionsPin#NameDescription1RANGETheRANGEpin’simpedancechangesaccordingtoVINpinvoltagelevel.WhentheinputvoltagedetectedbytheVINpinishigherthanathresholdvoltage,itsetstolowimpedance;whereasitsetstohighimpedanceifinputvoltageisatahighlevel.2COMPOutputpinoftheerroramplifier.Itisatransconductance-typeerroramplifierforPFCoutputvoltagefeedback.Proprietarymulti-vectorcurrentisbuilt-intothisamplifier;therefore,thecompensationforPFCvoltagefeedbackloopallowsasimplecompensationcircuitbetweenthispinandGND.3INVInvertinginputoftheerroramplifier.ThispinisusedtoreceivePFCvoltagelevelbyavoltagedividerandprovidesPFCoutputover-andunder-voltageprotections.ThispinalsocontrolsthePWMstartup.OncetheFAN6920MRisturnedonandVINVexceedsin2.3V,PWMstarts.4CSPFCInputtothePFCover-currentprotectioncomparatorthatprovidescycle-by-cyclecurrentlimitingprotection.WhenthesensedvoltageacrossthePFCcurrent-sensingresistorreachestheinternalthreshold(0.82Vtypical),thePFCswitchisturnedofftoactivatecycle-by-cyclecurrentlimiting.5CSPWMInputtothecomparatorofthePWMover-currentprotectionandperformsPWMcurrent-modecontrolwithFBpinvoltage.AresistorisusedtosensetheswitchingcurrentofthePWMswitchandthesensingvoltageisappliedtotheCSPWMpinforthecycle-by-cyclecurrentlimit,current-modecontrol,andhigh/lowlineover-powercompensationaccordingtoDETpin