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1、NCP1215ProductPreviewLowCostVariableOFFTimeSwitchedModePowerSupplyControllerhttp://onsemi.comTheNCP1215isacontrollerforlowpoweroff-lineflybackSwitchedModePowerSupplies(SMPS)featuringlowsize,weightMARKINGandcostconstraintstogetherwithagoodlowstandbypowerDIAGRAMSperformance.Theoperatingprincipleusess
2、witchingfrequency8reductionatlightloadbyincreasingtheOFFTime.Also,whenOFFSO-8P1215Timeexpands,thepeakcurrentisgraduallyreduceddowntoDSUFFIXALYWapproximately1/4ofthemaximumpeakcurrenttopreventfrom8CASE751excitingthetransformermechanicalresonances.Theriskofacoustic11noiseisthusgreatlydiminishedwhilek
3、eepinggoodstandbypowerperformance.TSOP-66Alowpowerinternalsupplyblockalsoensuresverylowcurrent6(SOT23-6,SC59-6)FAAYWconsumptionatstart-upwithouthamperingthestandbypowerSNSUFFIX1CASE318Gperformance.1AspecialprimarycurrentsensingtechniqueminimizestheimpactofSMPSswitchingoncontrolICoperation.Thechoice
4、ofpeakFAA=SpecificDeviceCodevoltageacrossthecurrentsenseresistorallowsdissipationtobeA=AssemblyLocationfurtherreduced.ThenegativecurrentsensingtechniqueoffersL=WaferLotY=YearadvantagesoveratraditionalapproachbyavoidingthevoltagedropW=WorkWeekincurredbytraditionalMOSFETsourcesensing.Thus,theICdrivec
5、apabilityisgreatlyimproved.PINCONNECTIONSFinally,thebulkinputrippleensuresanaturalfrequencyditheringwhichsmoothstheEMIsignature.SO-8FB18NCFeatures·VariableOFFTimeControlMethodCT27NC·VeryLowCurrentConsumptionatStart-upCS36VCC·NaturalFrequencyDitheringforImprovedEMISignatureGND45Gate·CurrentModeContr
6、olOperation(TopView)·PeakCurrentCompressionReducesTransformerNoise·ProgrammableCurrentSenseResistorPeakVoltageTSOP-6·UndervoltageLockoutCS16GateTypicalApplicationsGND25VCC·AuxiliaryPowerSupply·Stand-byPowerSupplyCT34FB·AC/DCAdapter(TopView)·Off-lineBatteryChargerORDERINGINFORMATIONDevicePackageShip
7、pingNCP1215DR2SO-82500Tape&ReelNCP1215SNT1TSOP-63000Tape&ReelThisdocumentcontainsinformationonaproductunderdevelopment.ONSemiconductorreservestherighttochangeordiscontinuethisproductwithoutnotice.?Semicondu
