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OnSemiCAT41066W多路LED驱动方案关键词：OnSemi,CAT4106,DC/DC转换器OnSemi(安森美)公司的CAT4106是多路LED驱动器和大功率DC/DC转换器,适用于六瓦的背景光供电.CAT4106集成了DC/DC升压转换器,四路LED驱动有非常好的电流匹配,效力高达92%,LED通路的压降低,在175mA时为500mV,高频PWM接口高达2kHz,主要用于LCD背景光照明和汽车与通用照明.本文介绍了CAT4106的主要特性,方框图和驱动一串与两串LED典型应用电路.TheCAT4106isanintegratedmulti-channelLEDdriverandhighpowerDC/DCconvertersuitableforpoweringbacklightingapplicationsuptoatotalof6watts.UptofourmatchedLEDstringscanbeaccuratelyprogrammedwithuniformdrivecurrentsetbyasingleexternalresistor.EachoutputchannelissuitableforLEDstringvoltagesofupto36V.Thedriverautomaticallyadjuststheoutputvoltagetodrivethehighestforwardvoltagestringwiththeminimumheadroomvoltagemaximizingtheefficiency.HighresolutiondimmingcontrolisachievedbytheEN/PWMlogicpinwhichsupportsmultiplefrequencies.ThisensuresprecisePWMdimmingcontrolwhilethedeviceremainsfullybiased.Inaddition,whenheldatlogiclow,thedevicetoenterafullshutdown“zero”currentmode.Externalprogrammingresistorssettheminimumandmaximumvoltagelimitsfortheacceptable“windowofoperation”forLEDstrings.Anychannelwhichfailstoregulatewithinthewindow(OpenorShortLED)isdetectedandflaggedontheFAULTlogicoutput(activelow,open-drain).Thedeviceisavailableina16-leadTQFN4mmx4mmandTSSOPwithexposedpadpackages.CAT4106主要特性:FourLEDChannelswithtightcurrentmatchingIntegratedDC/DCBoostconverterUpto6WLEDTotalOutputPowerUpto92%EfficiencyLowDropoutLEDChannels(500mVat175mA)HighFrequencyPWMinterface(upto2kHz)AdjustableShort/OpenLEDDetectionProgrammableLEDChannelcurrentAdjustableLEDChannelvoltageThermalshutdownprotectionRoHS-compliant16-leadTQFN4x4mmandTSSOPpackagesCAT4106应用:LCDBacklightLightingAutomotiveandGeneralPurposeLighting图1.CAT4106方框图图2.CAT4106典型应用电路图AO-Electronics傲壹电子官网：中文网：的应用电路图