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FairchildFAN9612双BCMBFC控制器方案关键词：电源管理,AC/DC转换器Fairchild公司的FAN9612是隔行扫描的双临界工作模式(BCM)BFC控制器,采用并行连接的180度反相输出进行控制,控制功率从300W到800W.和连续导通模式(CCM)技术不同,BCM使得升压二极管在零电流开关,因此降低了成本和损耗.可应用于100-1000W离线电源,大屏幕LCD-TV,PDP-TV,RP-TV的电源以及高端台式计算机和服输器点名源,获得80+证书的设备.本文介绍了FAN9612的主要特性,方框图,典型应用电路图以及采用FAN9612隔行扫描的BCMPFC电路图.FAN9612:InterleavedDualBCMPFCControllerTheFAN9612InterleavedDualBoundary-Conduction-Mode(BCM)Power-Factor-CorrectionControlleroperatestwoparallel-connectedboostpowertrains180ºoutofphase.Interleavingextendsthemaximumpracticalpowerlevelofthecontroltechniquefromabout300Wtogreaterthan800W.Unlikethecontinuousconductionmode(CCM)techniqueoftenusedathigherpowerlevels,BCMoffersinherentzero-currentswitchingoftheboostdiodes(noreverse-recoverylosses),whichpermitstheuseoflessexpensivediodeswithoutsacrificingefficiency.Furthermore,theinputandoutputfilterscanbemadesmallerduetoripplecurrentcancellationandeffectivedoublingoftheswitchingfrequency.Theconvertersoperatewithvariablefrequencywhichisafunctionoftheloadandtheinstantaneousinput/outputvoltages.Theswitchingfrequencyislimitedbetween18kHzand600kHz.ThePulseWidthModulatorsimplementvoltage-modecontrolwithinputvoltagefeedforward.WhenconfiguredforPFCapplications,theslowvoltageregulationloopresultsinconstanton-timeoperationwithinalinecycle.ThisPWMmethodcombinedwiththeBCMoperationoftheboostconvertersprovidesautomaticpowerfactorcorrection.TheFAN9612offersbiasUVLO,inputbrown-out,inputover-voltage,over-current,openfeedback,overtemperature,outputover-voltageandredundantlatchingover-voltageprotections.Furthermore,theconverters’outputpowerislimitedindependentlyoftheinputRMSvoltage.Synchronizationbetweenthepowerstagesismaintainedunderalloperatingconditions.TheFAN9612isavailableinLead(Pb)-Free16-leadSOICpackage.FAN9612主要特性:LowTotalHarmonicDistortion,HighPowerFactor180°OutofPhaseSynchronizationAutomaticPhaseDisableatLightLoad1.8ASink,0.8ASource,HighCurrentGateDriversTrans-conductance(gM)ErrorAmplifierVoltage-ModeControlwith(VIN)2FeedForwardClosed-LoopSoft-StartwithUser-ProgrammableSoft-StartTimeforReducedOvershootMinimumRestartTimerFrequencytoAvoidAudibleNoiseMaximumSwitchingFrequencyClampBrown-OutProtectionwithSoft-RecoveryNon-LatchingOVPonFBpinandLatchingSecondLevelProtectiononOVPPinOpenFeedbackProtectionOver-Current&Power-LimitProtectionforEachPhaseLowStart-UpCurrentof80-μATypicalWorkswithDC,50Hzto400HzacInputsFAN9612应用:100-1000WOff-linePowerSuppliesLargeScreenLCD-TV,PDP-TV,RP-TVPowerHigh-EndDesktopPCandServerPowerSupplies80-PLUSCertifiedEquipment图1.FAN9612方框图AO-Electronics傲壹电子官网：中文网：电路图