L4981 pdf datasheet (POWER FACTOR CORRECTOR)

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1、L4981AÒL4981BPOWERFACTORCORRECTORCONTROLBOOSTPWMUPTO0.99P.F.MULTIPOWERBCDTECHNOLOGYLIMITLINECURRENTDISTORTIONTO<5%UNIVERSALINPUTMAINSFEEDFORWARDLINEANDLOADREGULA-TIONAVERAGECURRENTMODEPWMFORMINIMUMNOISESENSITIVITYHIGHCURRENTBIPOLARANDDMOSTO-TEMPOLEOUTPUTLOWSTART-UPCURRENT(

2、0.3mATYP.)DIP20SO20UNDERVOLTAGELOCKOUTWITHHYS-TERESISANDPROGRAMMABLETURNONTHRESHOLDORDERINGNUMBERS:L4981X(DIP20)OVERVOLTAGE,OVERCURRENTPROTEC-L4981XD(SO20)TIONPRECISE2%ONCHIPREFERENCEEX-TERNALLYAVAILABLESOFTSTARTtrolfunctionsfordesigningahighefficiency-modepowersupplywiths

3、inusoidallinecurrentcon-sumption.DESCRIPTIONTheL4981canbeeasilyusedinsystemswithTheL4981I.C.providesthenecessaryfeaturesmainsvoltagesbetween85Vto265Vwithoutanytoachieveaveryhighpowerfactorupto0.99.lineswitch.ThisnewPFCoffersthepossibilitytoRealizedinBCD60IItechnologythispo

4、werfactorworkatfixedfrequency(L4981A)ormodulatedcorrector(PFC)pre-regulatorcontainsallthecon-frequency(L4981B)optimizingthesizeofthein-BLOCKDIAGRAMSeptember19981/17L4981A-L4981Bputfilter;boththeoperatingfrequencymodessoftstartareincluded.Tolimitthenumberoftheworkingwithana

5、veragecurrentmodePWMcon-externalcomponents,thedeviceintegratespro-troller,maintainingsinusoidallinecurrentwithouttectionsasovervoltageandovercurrent.Theslopecompensation.overcurrentlevelcanbeprogrammedusingaBesidespowerMOSFETgatedriver,precisevolt-simpleresistorforL4981A.F

6、orabetterprecisionagereference(externallyavailable),errorampli-andforL4981Banexternaldividermustbeused.fier,undervoltagelockout,currentsenseandtheABSOLUTEMAXIMUMRATINGSSymbolPinParameterValueUnitVCC19SupplyVoltage(ICC£50mA)(*)selflimitVIGDRV20Gatedriv.outputpeakcurrent(t=1

7、ms)SINK2A.SOURCE1.5AVGDRVGatedriv.outputvoltaget=0.1ms-1VVoltagesatpins3,14,7,6,12,15-0.3to9VVVA-OUT13ErrorAmplifierVoltage-0.3to8.5VIAC4ACInputCurrent5mAVoltagesatpin8,9-0.5to7VVCA-OUT5CurrentAmplifierVolt.(Isource=-20mA;Isink=20mA)-0.3to8.5VVROSC17Voltageatpin17-0.3to3V1

8、1,18Voltageatpin11,18-0.3to7VICOSC18InputSinkCurrent15mAIFREQ-MOD16FrequencyModulationSin