NCP1217中文资料

SemiconductorComponentsIndustries,LLC,2004July,2004−Rev.31PublicationOrderNumber:NCP1217/DNCP1217,NCP1217AEnhancedPWMCurrent-ModeControllerforHigh-PowerUniversalOff-LineSuppliesHousedinanSO−8orPDIP−7package,theNCP1217representstheenhancedversionoftheNCP1203−basedcontrollers.Thankstoitshighdrivecapability,NCP1217driveslargegate−chargeMOSFETs,whichtogetherwithinternalrampcompensationandbuilt−inovervoltageprotection,easethedesignofmodernAC/DCadapters.NCP1217offersatruealternativetoUC384X−baseddesigns.Withaninternalstructureoperatingatdifferentfixedfrequencies(65–100–133kHz),thecontrollerfeaturesahigh−voltagestartupFET,whichensuresacleanandlosslessstartupsequence.Itscurrent−modecontroltopologyprovidesanexcellentinputaudio−susceptibilityandinherentpulse−by−pulsecontrol.Internalrampcompensationeasilypreventssubharmonicoscillationsfromtakingplaceincontinuousconductionmodedesigns.Whenthecurrentsetpointfallsbelowagivenvalue,e.g.theoutputpowerdemanddiminishes,theICautomaticallyenterstheso−calledskipcyclemodeandprovidesexcellentefficiencyatlightloads.Becausethisoccursatauseradjustablelowpeakcurrent,noacousticnoisetakesplace.TheNCP1217featurestwoefficientprotectivecircuitries:1)Inpresenceofanovercurrentcondition,theoutputpulsesaredisabledandthedeviceentersasafeburstmode,tryingtorestart.Oncethedefaulthasgone,thedeviceauto−recovers.2)Ifanexternalsignal(e.g.atemperaturesensor)pullsPin1above3.2V,outputpulsesareimmediatelystoppedandtheNCP1217stayslatchedinthisposition.ResetoccurswhentheVCCcollapsestoground,e.g.theuserunplugsthepowersupply.Features•Current−ModewithAdjustableSkip−CycleCapability•Built−inInternalRampCompensation•Auto−RecoveryInternalOutputShort−CircuitProtection•Internal1.0msSoft−Start(AVersionOnly)•LimitedDuty−Cycleto50%(AVersionOnly)•FullLatchoffifAdjustmentPinisBroughtHigh•ExtremelyLowNo−LoadStandbyPower•InternalTemperatureShutdown•500mAPeakCurrentCapability•FixedFrequencyVersionsat65kHz,100kHzand133kHz•DirectOptocouplerConnection•InternalLeadingEdgeBlanking•SPICEModelsAvailableforTRANsientandACAnalysis•Pb−FreePackagesareAvailableTypicalApplications•HighPowerAC/DCConvertersforTVs,Set−TopBoxes,etc.•OfflineAdaptersforNotebooks•TelecomDC−DCConverters•AllPowerSuppliesPDIP−7PSUFFIXCASE626B1818SO−8DSUFFIXCASE75118534(TopView)AdjCSHVPINCONNECTIONS762NCFBGndDrvVCCMARKINGDIAGRAMSSeedetailedorderingandshippinginformationintheorderinginformationsectiononpage16ofthisdatasheet.ORDERINGINFORMATIONXXXX=SpecificDeviceCode*A=AssemblyLocationWL,L=WaferLotYY,Y=YearWW,W=WorkWeek*DEVICEMARKINGINFORMATION://onsemi.com2Figure1.TypicalApplicationExampleEMIFILTERUNIVERSALINPUT++NCP1217+VOUTAux.AdjFBCSGndHVVCCDrv12348765RampAdjustmentSeeApplicationSectionÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁPINFUNCTIONDESCRIPTIONÁÁÁÁÁÁÁÁPinNo.ÁÁÁÁÁÁÁÁÁÁPinNameÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁFunctionÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁDescription1AdjAdjusttheskippingpeakcurrentThispinletsyouadjustthelevelatwhichthecycleskippingprocesstakesplace.Shortingthispintogroundpermanentlydisablestheskipcyclefeature.Bybringingthispinabove3.1V,youpermanentlyshutoffthedevice.2FBSetsthepeakcurrentsetpointByconnectinganoptocouplertothispin,thepeakcurrentsetpointisadjustedaccordinglytotheoutputpowerdemand.3CSCurrentsenseinputThispinsensestheprimarycurrentandroutesittotheinternalcomparatorviaanL.E.B.Byinsertingaresistorinserieswiththepin,youcontroltheamountoframpcompensationyouneed.4GndTheICground−5DrvDrivingpulsesThedriver’soutputtoanexternalMOSFET.6VCCSuppliestheICThispinisconnectedtoanexternalbulkcapacitoroftypically22F.7NC−Thisunconnectedpinensuresadequatecreepagedistance.8HVEnsuresacleanandlosslessstartupsequenceConnectedtothehigh−voltagerail,thispininjectsaconstantcurrentintotheVCCcapacitorduringthestartupsequence.NCP1217,NCP1217A±500mAHVCurrentSourceInternalVCC8765HVNCVCCDrv1234QFlip−FlopDCmax=74%Q250nsL.E.B.65−100−133kHzClock-+-+80k20k57k1VCurrentSenseGroundFBAdj24k25k+−VREFReset1.1VSkipCycleComparatorSet19kRampCompensationReset-+LatchoffComparator+−LatchResetSet3.1VUVLO1msSS**Availablefor“A”versiononlyÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁMAXIMUMRATINGSÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁRatingÁÁÁÁÁÁÁÁSymbolÁÁÁÁÁÁÁÁÁÁValueÁÁÁÁÁÁUnitPowerSupplyVoltageVCC16VPowerSupplyVoltageonAllOtherPinsExceptPin8(HV),Pin6(VCC)andPin5(Drv)−−0.3to10VMaximumVoltageonPin8(HV),Pin6(VCC)DecoupledtoGroundwith10FVHV500VMaximumVoltageonPin8(HV),Pin6(VCC)GroundedVHV450VMaximumCurrentintoAllPinsExceptVCC(6)andHV(8)when10VESDDiodesareActivated−5.0mAThermalResistance,Junction−to−CaseRθJC57°C/WThermalResistance,Junction−to−Air,PDIP−7VersionThermalResistance,Junction−to−Air,SO−8VersionRθJARθJA100178°C/WMa