固定频率电流 反激式模式过程控制器 变流器

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1、NCP1246FixedFrequencyCurrentModeControllerforFlybackConvertersTheNCP1246isanewfixed−frequencycurrent−modecontrollerfeaturingtheDynamicSelf−Supply.Thisfunctiongreatlysimplifieswww.onsemi.comthedesignoftheauxiliarysupplyandtheVCCcapacitorbyactivatingtheinternal

2、startupcurrentsourcetosupplythecontrollerduringMARKINGstart−up,transients,latch,stand−byetc.ThisdevicecontainsaspecialDIAGRAMHVdetectorwhichdetecttheapplicationunplugfromtheACinput8lineandtriggerstheX2dischargecurrent.ThisHVstructureallows46XXfffthebrown−outd

3、etectionaswell.ALYWXItfeaturesatimer−basedfaultdetectionthatensuresthedetectionofSOIC−7GoverloadandanadjustablecompensationtohelpkeepthemaximumCASE751U1powerindependentoftheinputvoltage.46XXfff=SpecificDeviceCodeDuetofrequencyfoldback,thecontrollerexhibitsexc

4、ellentXX=A,BorALefficiencyinlightloadconditionwhilestillachievingverylowfff=065or100standbypowerconsumption.Internalfrequencyjittering,rampA=AssemblyLocationL=WaferLotcompensation,andaversatilelatchinputmakethiscontrolleranY=Yearexcellentcandidatefortherobust

5、powersupplydesigns.W=WorkWeekAdedicatedOffmodeallowstoreachtheextremelylownoloadG=Pb−FreePackageinputpowerconsumptionviasleepingwholedeviceandthusminimizethepowerconsumptionofthecontrolcircuitry.PINCONNECTIONSFeaturesLatch18HV•Fixed−FrequencyCurrent−ModeOpera

6、tion(65kHzand100kHzFB2frequencyoptions)CS36VCC•FrequencyFoldbackthenSkipModeforMaximizedPerformanceinLightLoadandStandbyConditionsGND45DRV•Timer−BasedOverloadProtectionwithLatched(OptionA)or(TopView)Auto−Recovery(OptionB)Operation•High−voltageCurrentSourcewit

7、hBrown−OutDetectionandORDERINGINFORMATIONDynamicSelf−Supply,SimplifyingtheDesignoftheVCCCircuitrySeedetailedorderingandshippinginformationinthepackagedimensionssectiononpage38ofthisdatasheet.•FrequencyModulationforSoftenedEMISignature•AdjustableOverpowerProte

8、ctionDependantontheBulkVoltage•Latch−offInputCombinedwiththeOverpowerProtectionSensingInput•VCCOperationupto28V,WithOvervoltageDetection•500/800mASource/SinkDrivePeakCurrentCapability•10m