电子技术论坛

PRIMARYSIDECONTROLICFOROFF-LINEBATTERYCHARGERSAP3706PreliminaryDatasheet1BCDSemiconductorManufacturingLimitedMay2008Rev.1.2GeneralDescriptionTheAP3706isahighperformanceAC/DCpowersup-plycontrollerforbatterychargerandadapterapplica-tions.ThedeviceusesPulseFrequencyModulation(PFM)methodtobuilddiscontinuousconductionmode(DCM)flybackpowersupplies.TheAP3706providesconstantvoltage,constantcur-rent(CV/CC)regulationwithoutrequiringanopto-couplerandsecondarycontrolcircuitry.Italsoelimi-natestheneedofloopcompensationcircuitrywhilemaintainingstability.TheAP3706achievesexcellentregulationandhighpowerefficiency,theno-loadpowerconsumptionislessthan200mWat265VACinput.TheAP3706isavailableinSOIC-8package.Features·PrimarySideControlforRectangularConstantCurrentandConstantVoltageOutput·EliminatesOpto-CouplerandSecondaryCV/CCControlCircuitry·EliminatesControlLoopCompensationCircuitry·FlybackTopologyinDCMOperation·RandomFrequencyModulationtoReduceSystemEMI·ValleyTurnonofExternalPowerNPNTransistor·Built-inSoftStart·OpenCircuitProtection·OverVoltageProtection·ShortCircuitProtectionApplications·Adapters/ChargersforCell/CordlessPhones,PDAs,MP3andOtherPortableApparatus·StandbyandAuxiliaryPowerSuppliesFigure1.PackageTypeofAP3706SOIC-8://www.elecfans.com电子发烧友PRIMARYSIDECONTROLICFOROFF-LINEBATTERYCHARGERSAP3706PreliminaryDatasheet2BCDSemiconductorManufacturingLimitedMay2008Rev.1.2PinConfigurationFigure2.PinConfigurationofAP3706(TopView)MPackage(SOIC-8)CSOUTVCCGNDCOMPBIASVDDFB87651234PinDescriptionPinNumberPinNameFunction1CSTheprimarycurrentsense2VCCSupplyvoltage3OUTThispindrivesthebaseofexternalpowerNPNswitch4GNDGround5FBThevoltagefeedbackfromtheauxiliarywinding6VDDThe5Voutputoftheinternalvoltageregulator7BIASThispinsetsthebiascurrentinsideAP3706withanexternalresistortoGND8COMPThispinconnectsabypasscapacitorforCCfunction://www.elecfans.com电子发烧友PRIMARYSIDECONTROLICFOROFF-LINEBATTERYCHARGERSAP3706PreliminaryDatasheet3BCDSemiconductorManufacturingLimitedMay2008Rev.1.2FunctionalBlockDiagramFigure3.FunctionalBlockDiagramofAP3706VCCOUTGNDVDDBIASFBCOMPCSRegulator&BiasOVP&OCkPTonsecDetectorS&H0.1V4.0VpfmTonsUVLOVeaCOMPCOMPEATonsV+pfm_dUVLOproCV_ctrlCOMPCOMPLEBDelay430nspfm_dpfmpfmDriverRQSRQSVDDITons0.5V0.46V0.75*I3.75VCC_ctrlVeaV+tCOMP26734815://www.elecfans.com电子发烧友PRIMARYSIDECONTROLICFOROFF-LINEBATTERYCHARGERSAP3706PreliminaryDatasheet4BCDSemiconductorManufacturingLimitedMay2008Rev.1.2ParameterValueUnitSupplyVoltageVCC-0.3to30VVoltageatCS,BIAS,OUT,VDD,COMPtoGND-0.3to7VFBinput(Pin5)-40to10VOutputCurrentatOUTInternallylimitedAPowerDissipationatTA=25oC0.657WOperatingJunctionTemperature150oCStorageTemperature-65to150oCLeadTemperature(Soldering,10s)300oCThermalResistanceJunction-to-Ambient190oC/WESD(MachineModel)200VNote1:StressesgreaterthanthoselistedunderAbsoluteMaximumRatingsmaycausepermanentdamagetothedevice.Thesearestressratingsonly,andfunctionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedunderRecommendedOperatingConditionsisnotimplied.ExposuretoAbsoluteMaximumRatingsforextendedperiodsmayaffectdevicereliability.AbsoluteMaximumRatings(Note1)PackageTemperatureRangePartNumberMarkingIDPackingTypeLeadFreeGreenLeadFreeGreenSOIC-8-40to85oCAP3706M-E1AP3706M-G13706M-E13706M-G1TubeAP3706MTR-E1AP3706MTR-G13706M-E13706M-G1Tape&ReelBCDSemiconductor'sPb-freeproducts,asdesignatedwithE1suffixinthepartnumber,areRoHScompliant.ProductswithG1suffixareavailableingreenpackages.OrderingInformationCircuitTypeE1:LeadFreeAP3706-TR:TapeandReelBlank:TubePackageM:SOIC-8G1:Green://www.elecfans.com电子发烧友PRIMARYSIDECONTROLICFOROFF-LINEBATTERYCHARGERSAP3706PreliminaryDatasheet5BCDSemiconductorManufacturingLimitedMay2008Rev.1.2ParameterSymbolConditionsMinTypMaxUnitUVLOSECTIONStart-upThresholdVTH(ST)1718.520VMinimalOperatingVoltageVOPR(min)Afterturnon6.77.48.1VREFERENCEVOLTAGESECTIONBIASPinVoltageVBIASRBIAS=200kΩ,Beforeturnon1.1701.2051.240VVDDPinVoltageVDD4.755.05.25VSTANDBYCURRENTSECTIONStart-upCurrentISTVCC=VTH(ST)-0.5V,RBIAS=200kΩ,Beforeturnon7080μAOperatingCurrentICC(OPR)RBIAS=200kΩ680900μADRIVEOUTPUTSECTIONOUTMaximumCurrentSinkIOUTRBIAS=200kΩ50mASource2530CURRENTSENSESECTIONCurrentSenseThresholdVCS480500520mVPre-CurrentSenseVCS(PRE)440460480mVLeadingEdgeBlanking430nsFEEDBACKINPUTSECTIONFeedbackThresholdVFB3.904.004.10VEnableTurn-onVoltageVFB(EN)-0.9-0.7-0.5VCOMPTHRESHOLDVOLTAGESECTIONTurn-onThresholdVoltageVCOMP3.423.603.78VPROTECTIONSECTIONOverVoltageProtectionVFB(OVP)789V(VCC=15V,TA=25oC,unlessotherwisespecified.)ElectricalCharacteristics://www.elecfans.com电子发烧友PRIMARYSIDECONTROLICFOROFF-LINEBATTERYCHARGERSAP3706PreliminaryDatasheet6BCDSemiconductorManufacturingLimitedMay2008Rev.1.2TypicalPerformanceCharacteristicsFigure6.OperatingCurrentvs.AmbientTemperatureFigure4.Start-upVoltagevs.AmbientTemperatureFigure5.Start-upCurrentvs.AmbientTemperatureFigure7.VDDvs.AmbientTemperature-40