DiodesAL991013WLED替代T8荧光管解决方案

DiodesAL991013WLED替代T8荧光管解决方案关键词：电源管理,LED驱动器,AC/DC转换器,Diodes公司的AL9910/A是PWM高效高压高亮LED驱动器控制集成电路.源电压从85VAC到256VAC,输入电压高达500V.AL9910能以固定频率高达300kHz驱动外接MOSFET,输出电流从几毫安到大于1.0A,效率高于90%,主要应用在DC/DC或AC/DCLED驱动器,RGB背光LED驱动器,平板显示器背光,通用恒流源以及装饰LED照明.本文介绍了AL9910/A主要特性,功能方框图,典型应用电路图和带与不带无源PFC的典型应用电路图,以及15瓦LED替代T8荧光管的电路图,材料清单和PCB布局图.TheAL9910/AhighvoltagePWMLEDdriver-controllerprovidesanefficientsolutionforofflinehighbrightnessLEDlampsfromrectifiedlinevoltagesrangingfrom85VACupto277VAC.TheAL9910drivesexternalMOSFETsatswitchingfrequenciesupto300kHz,withtheswitchingfrequencydeterminedbyasingleresistor.TheAL9910topologycreatesaconstantcurrentthroughtheLEDsprovidingconstantlightoutput.TheoutputcurrentisprogrammedbyoneexternalresistorandisultimatelydeterminedbytheexternalMOSFETchosenandthereforeallowsmanylowcurrentLEDstobedrivenaswellasafewhighcurrentLEDsTheLEDbrightnesscanbevariedbybothLinearandPWMdimmingusingtheAL9910’sLDandPWM_Dpinsrespectively.ThePWM_Dinputoperateswithdutyratioof0-100%andfrequencyofuptoseveralkHz.TheAL9910canwithstandinputvoltagesupto500Vwhichmakesitveryresilienttotransientsatstandardmainsvoltages.AswellasstandardSO-8packagetheAL9910isavailableinthethermallyenhancedSO-8EPpackage.AL9910/A主要特性和优势:•90%Efficiency•Universalrectified85to277VACinputrange•Inputvoltagesurgeratingsupto500V•Internalvoltageregulatorremovesstart-upresistoro7.5VMOSFETdrive–AL9910o10VMOSFETdrive–AL9910A•Constant-currentLEDdriver•ApplicationsfromafewmAtomorethan1AOutput•PWMLow-FrequencyDimmingviaEnablepin•InternalThermalProtection(OTP)•SO-8andSO-8EPin“Green”MoldingCompound(NoBr,Sb)•LeadFreeFinish/RoHSCompliantAL9910/A应用:•DC/DCorAC/DCLEDDriverapplication•RGBBacklightingLEDDriver•BackLightingofFlatPanelDisplays•Generalpurposeconstantcurrentsource•SignageandDecorativeLEDLighting图1.AL9910/A功能方框图图2.AL9910/A典型应用电路图图3.AL9910/A带无源PFC的典型应用电路图采用AL9910高压LED控制器的高功率系数LED替代T8荧光管ThisapplicationnotedescribestheprinciplesanddesignequationsrequiredforthedesignofahighbrightnessLEDlampusingtheAL9910.Theequationsarethenusedtodemonstratethedesignofauniversal,offline,highpowerfactor(PF),13WLEDlampsuitableforuseasthereplacementforT8fluorescenttube.Acompletedesignincludingtheelectricaldiagram,componentlistandperformancemeasurementsareprovided.图4.LED替代T8荧光管驱动器外形图图5.高功率系数15瓦LED灯电路图15瓦LED灯材料清单:AO-Electronics傲壹电子官网：中文网：灯顶层和底层布局图