次级同步整流芯片(替代IW676-IW673)-ZCC1576.doc

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1、ZCC1576DigitalSynchronousRectiferControllerOptimizedforWideRangeOutputwithOptionalActiveVoltagePositionControl1.0GeneralDescription19of19ZCC1576DigitalSynchronousRectiferControllerOptimizedforWideRangeOutputwithOptionalActiveVoltagePositionControlTheZCC1576isanadvancedsynchronousrectifiercontro

2、llerwithanintegratedMOSFETdriverfordiscontinuousmodeflybackconverters.ThedeviceworkswithanexternalpowerMOSFETtoreplacethemainrectifyingdiodeonthesecondaryofaflybackconverter,improvingefficiencybyreducingconductionlossesonthesecondary.Ituseslosslesssensingbymonitoringthevoltageacrossthesynchrono

3、usMOSFETtodeterminewhentoswitchtheMOSFET,furtherimprovingefficiency.Thedigitaladaptiveturn-offcontroltechnologyminimizesturn-offdeadtime,eliminatingtheneedforanadditionalSchottkydiodethatistypicallyneededinparallelwiththesynchronousMOSFETinconventionalsynchronousrectifiers.TheZCC1576hastheabili

4、tytoworkathighandlowvoltagestoaccommodateawidearrayofpowersupplieswithoutadditionalexternalcomponents.Itisoptimizedforoutputvoltagesfrom3Vto12Vandcansensedrainvoltagesupto100V,eliminatingtheneedforanexternalclampingcircuitinapplicationswithmulti-leveloutputvoltageandcurrent.Anuniqueinternalregu

5、latorcircuitenablestheZCC1576tooperatedowntoverylowvoltagesontheoutputofthepowersupply,optimizingthedeviceforDirectChargingapplicationsdowntosub-3Vlevels.TheZCC1576integratesAVPcontrolforfastdynamicloadresponseandverylowno-loadpowerconsumption(non-rapidchargeapplications),withoutincreasingthepa

6、ckagesizeorpincount.FeatureswOptimizedforsystemoutputvoltagesfrom3Vto12Vinmulti-leveloutputvoltageandcurrentapplicationswIntegratedpulselinearregulator(PLR)enableshighefficiencySRoperationdownto3Vunderallloadconditionsandbelow2.4Vunderconstantcurrent(CC)modecondtionwSupportsDirectChargedowntosu

7、b-3VlevelswHighvoltageDrainsensingupto100Vwithnoadditionalexternalclampingcircuitsrequiredw6-pinSOT23packagewDigitaladaptiveturn-offcontrolminimizesdead-timeandeliminatestheparallelSchottkydiodewLosslessMOSFETVDSsensingforSRtiming