L6565DTR中文资料

1/17L6565January2003■QUASI-RESONANT(QR)ZERO-VOLTAGE-SWITCHING(ZVS)TOPOLOGY■LINEFEEDFORWARDTODELIVERCONSTANTPOWERvs.MAINSCHANGE■FREQUENCYFOLDBACKFOROPTIMUMSTANDBYEFFICIENCY■PULSE-BY-PULSE&HICCUP-MODEOCP■ULTRA-LOWSTART-UP(70μA)ANDQUIESCENTCURRENT(3.5mA)■DISABLEFUNCTION(ON/OFFCONTROL)■1%PRECISION(@Tj=25°C)INTERNALREFERENCEVOLTAGE■±400mATOTEMPOLEGATEDRIVERWITHUVLOPULL-DOWN■BLUEANGEL,ENERGYSTAR,ENERGY2000COMPLIANTAPPLICATIONS■TV/MONITORSMPS■AC-DCADAPTERS/CHARGERS■DIGITALCONSUMER■PRINTERS,FAXMACHINES,PHOTOCOPIERSANDSCANNERSDESCRIPTIONTheL6565isacurrent-modeprimarycontrollerIC,specificallydesignedtobuildofflineQuasi-resonantZVS(ZeroVoltageSwitchingatswitchturn-on)fly-backconverters.Quasi-resonantoperationisachievedbymeansofatransformerdemagnetizationsensinginputthattrig-gersMOSFET'sturn-on.DIP8(Minidip)SO-8ORDERINGNUMBERS:L6565NL6565DQUASI-RESONANTSMPSCONTROLLERBLOCKDIAGRAM+-VREF2VOLTAGEREGULATORINTERNALSUPPLY+-2.5VR1R2+-DRIVER+-ZEROCURRENTDETECTOR2.1V1.6VVCC81234ZCDVCCINVCOMPVFFCSGD75GND620V40K5pFBLANKINGLINEVOLTAGEFEEDFORWARDHiccup-modeOCPDISABLERSQSTARTER2V+-Hiccup-modeOCPStarterSTOPQUVLOBlankingSTARTL65652/17DESCRIPTION(continued)Converter'spowercapabilityvariationswiththemainsvoltagearecompensatedbylinevoltagefeedforward.Atlightloadthedevicefeaturesaspecialfunctionthatautomaticallylowerstheoperatingfrequencystillmain-tainingtheoperationasclosetoZVSaspossible.Inadditiontoverylowstart-upandquiescentcurrents,thisfeaturehelpskeeplowtheconsumptionfromthemainsatlightloadandbeBlueAngelandEnergyStarcom-pliant.TheICincludesalsoadisablefunction,anon-chipfilteroncurrentsense,anerroramplifierwithapreciseref-erencevoltageforprimaryregulationandaneffectivetwo-levelovercurrentprotection.PINCONNECTION(Topview,MinidipandSO8)PINDESCRIPTIONN°NameFunction1INVInvertinginputoftheerroramplifier.Theinformationontheoutputvoltageisfedintothepinthrougheitheraresistordivider(primaryregulation)oranoptocoupler(secondaryfeedback).Thispincanbegroundedinsomesecondaryfeedbackschemes(seepin2).2COMPOutputoftheerroramplifier.Typically,acompensationnetworkisplacedbetweenthispinandtheINVpintoachievestabilityandgooddynamicperformanceofthevoltagecontrolloop.Withsecondaryfeedback,thepincanbealsodrivendirectlybyanoptocouplertocontrolPWMbymodulatingthecurrentsunkfromthepin(withtheINVpingrounded).3VFFLinevoltagefeedforward.Theinformationontheconverter’sinputvoltageisfedintothepinthrougharesistordividerandisusedtochangethesetpointofthepulse-by-pulsecurrentlimitation(thehigherthevoltage,thelowerthesetpoint).Ifthisfunctionisnotdesiredthepinwillbegroundedandthecurrentlimitationsetpointwillbemaximum.4CSInputtothePWMcomparator.Theprimarycurrentissensedthrougharesistor,theresultingvoltageisappliedtothispinandcomparedwithaninternalreferencetodetermineMOSFET’sturn-off.Theinternalreferenceisclampedatavalue,whichdefinesthepulse-by-pulsecurrentlimitationsetpoint,dependingonthevoltageatpinVFF.IfthesignalatthepinCSexceeds2V,thegatedriverwillbedisabled(Hiccup-modeOCP).5ZCDTransformer’sdemagnetizationsensinginputforQuasi-Resonantoperation.Alternately,synchronizationinputforanexternalsignal.Anegative-goingedgetriggersMOSFET’sturn-on.Thetriggercircuitisblankedforaminimumof3.5μsafterMOSFETturn-off,forsafeoperationundershortcircuitconditionsandfrequencyfoldback.IfthepinisgroundedtheICwillbedisabled.6GNDGround.CurrentreturnforboththesignalpartoftheICandthegatedriver.7GDGatedriveroutput.ThetotempoleoutputstageisabletodrivepowerMOSFET’sandIGBT’swithapeakcurrentof400mA(sourceandsink).8VccSupplyVoltageofboththesignalpartoftheICandthegatedriver.Anelectrolyticcapacitorisconnectedbetweenthispinandground.Aresistorconnectedfromthispintotheconverter’sinputbulkcapacitorwillbetypicallyusedtostartupthedevice.ZCDINVCOMPVFFCSVccGDGND123487653/17L6565THERMALDATAABSOLUTEMAXIMUMRATINGSSymbolParameterSO8MinidipUnitRthj-ambMax.ThermalResistance,Junction-to-ambient150100°C/WSymbolPinParameterValueUnitIVcc8ICC+IZ30mAIGD7OutputTotemPolePeakCurrent(2μs)±700mAINV,COMP,VFF,CS1,2,34AnalogInputs&Outputs-0.3to7VIZCD5ZeroCurrentDetector50(source)-10(sink)mAPtotPowerDissipation@Tamb=50°C(Minidip)(SO8)10.65WTjJunctionTemperatureOperatingrange-40to150°CTstgStorageTemperature-55to150°CELECTRICALCHARACTERISTCS(Tj=-25to125°C,VCC=12V,Co=1nF;unlessotherwisespecified)SymbolParameterTestConditionMin.Typ.Max.UnitSUPPLYVOLTAGEVccOperatingrangeAfterturn-on10.318VCCOnTurn-onthreshold12.513.514.5VVCCOffTurn-offthreshold8.79.510.3VHysHysteresis3.6544.3VVZZenerVoltageIcc=25mA182022VSUPPLYCURRENTIstart-upStart-upCurrentBeforeturn-on,VCC=12V4570μAIqQuiescentCurrentAfterturn-on2.33.5mAICCOperatingSupplyCurrent@70kHz3.55mAIqQuiescentCurrentDuringHiccup-modeOCP1.63.5mAIqQuiescentCurrentVZCDVDIS,VCCVCCOff1.42.1mALINEFEEDFORWARDIVFFInputBiasCurrentVVFF=0to3V-1μAVVFFOperatingRange0to3VKGainVVFF=1.5V,VCOMP=4V0.16ERRORAMPLIFIERVINVVoltageFeedbackInputThresholdTamb=25°C2.4652.52.535V12VVCC18V2.442.56LineRegulationVcc=12to18V25mVIINVInputBiasCurrent-0.1-1μAL65654/17GVVoltageGainOpenloop6080dBGBGain-BandwidthProduct1MHzICOMPSo