FairchildFAN302HL低待机功耗PWM电源控制方案

FairchildFAN302HL低待机功耗PWM电源控制方案关键词：电源管理,AC/DC转换器,DC/DC转换器,PWM,Fairchild公司的FAN302HL是低待机功耗电池充电器用的PWM电源控制器,采用恒流模式控制,在230VAC时的带机功耗低于10mW,固定PWM频率85kHz和跳频,以降低EMI,工作电流3.5A,栅极输出最大电压箝位在15V,具有高压起动功能,主要用在手机,无绳电话,PDA和数码相机等电池充电器.本文介绍了FAN302HL主要特性,功能方框图,高压(HV)起动电路图,反激转换器电路图和典型应用电路图以及变压器结构图和绕组指标.FAN302HLPWMControllerforLowStandbyPowerBattery-ChargerApplicationsThishighlyintegratedPWMcontroller,FAN302HL,providesseveralfeaturestoenhancetheperformanceofgeneralflybackconverters.Theconstant-currentcontrol,proprietarytopologyenablessimplifiedcircuitdesignswithoutsecondaryfeedbackcircuitryforbatterychargerapplications.AproprietaryBurst-Modefunctionwithlowoperationcurrentminimizesstandbypowerconsumption.TheFAN302HLcontrolleralsoprovidesseveralprotections.Cycle-by-cyclecurrentlimitingensuresthefixedpeakcurrentlimitlevel,evenifashortcircuitoccurs.Thegateoutputisclampedat15VtoprotectthepowerMOSfromhighgate-sourcevoltageconditions.IfeitherVSOVPorinternalOTPistriggered,thecircuitentersLatchModeuntilACpowerisremoved.UsingFAN302HL,achargercanbeimplementedwithfewexternalcomponentsandminimizedcost,comparedtoaconventionaldesignoralineartransformer.FAN302HL主要特性:Ultra-LowStandbyPower:Under10mWat230VACConstant-Current(CC)ControlwithoutSecondary-FeedbackCircuitryFixedPWMFrequencyat85kHzwithFrequencyHoppingtoSolveEMIProblemHigh-VoltageStartupLowOperatingCurrent:3.5mAPeak-Current-ModeControlinCVRegulationCycle-by-CycleCurrentLimitingVDDOver-VoltageProtection(Auto-Restart)VSOver-VoltageProtection(LatchMode)VDDUnder-VoltageLockout(UVLO)GateOutputMaximumVoltageClampedat15VFixedOver-TemperatureProtection(LatchMode)Availableinan8-LeadSOICPackageFAN302HL应用:Batterychargersforcellularphones,cordlessphones,PDA,digitalcameras,andpowertools.ReplaceslineartransformersandRCCSMPS.图1.FAN302HL功能方框图图2.FAN302HL简化反激转换器电路图图3.FAN302HL高压(HV)起动电路图图4.FAN302HL典型应用电路图5.FAN302HL典型应用电路图AO-Electronics傲壹电子官网：中文网：变压器结构图变压器绕组指标: