linear lt3496三输出led驱动方案

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1、.LinearLT3496三输出LED驱动方案关键词：电源管理,LED驱动器,DC/DC转换器Linear公司的LT3496是三输出DC/DC转换器，能作为恒流工作，非常适合用来驱动LED。可调开关频率在330kHz到1MHz，调光比达3000:1，可工作在降压，升压和降-升压模式，内置了750mA/45V开关的三路独立驱动器，有开路LED保护，主要用在RGB照明，汽车和军用飞机照明，广告牌和大型显示器以及恒流源。本文介绍了LT3496主要特性，方框图，多种应用电路以及LT3496EUFD评估板主要特性和电路图。TheLTR3496isatripleoutputDC/DCconve

2、rterdesignedtooperateasaconstant-currentsourceandisidealfordrivingLEDs.TheLT3496worksinbuck,boostorbuckboostmode.TheLT3496usesafixedfrequency,currentmodearchitectureresultinginstableoperationoverawiderangeofsupplyandoutputvoltages.Afrequencyadjustpinallowstheusertoprogramswitchingfrequencybetw

3、een330kHzand2.1MHztooptimizeefficiencyandexternalcomponentsize.TheLT3496supports3000:1dimmingcontroloneachchannel.Eachofthethreeregulatorsisindependentlyoperatedbythatchannel’sPWMsignal.ThePWMfeatureallowspreciseadjustmentofthecolormixingordimmingratiooftheLEDsource.Eachofthethreechannelshasab

4、uilt-ingatedrivertodriveanexternalLED-disconnectP-channelMOSFET,allowinghighdimmingrange.TheoutputcurrentrangeofeachchanneloftheLT3496isprogrammedwithanexternalsenseresistor.TheCTRLpinsareusedtoadjusttheLEDcurrentseitherforanalogdimmingorovertemperatureprotection.LT3496主要特性:TrueColorPWM™Dimmin

5、gDeliversUpto3000:1DimmingRatioBuilt-InGateDriverforPMOSLEDDisconnectThreeIndependentDriverChannelswith750mA,45VInternalSwitchesOperatesinBuck,Boost,Buck-BoostModesCTRLPinAccuratelySetsLEDCurrentSenseThresholdOveraRangeof10mVto100mVAdjustableFrequency:330kHzto2.1MHz...OpenLEDProtectionWideVINS

6、upplyRange:Operationfrom3Vto30VTransientProtectionto40VSurfaceMountComponents5mm)QFNandTSSOPPackages28-Lead(4mmxLT3496应用:RGBLightingBillboardsandLargeDisplaysAutomotiveandAvionicLightingConstant-CurrentSources...图1。LT3496方框图（升压配置）...图2。LT3496高调光比三输出LED电源图3。LT3496降压模式BOM最低的LED驱动器...图4。LT3496三输出

7、100mAx10LED驱动器图5。LT3496双路升压LED驱动器...图6。LT3496三输出升压20mAx8LED驱动器...图7。LT3496降压-升压模式30mAx6LED驱动器图8。LT3496三输出降压模式带开路LED保护LED驱动器图9。LT3496三输出降压模式3x500mALED串驱动器...图10。LT3496三输出升压模式200mALED驱动器...图11。LT3496三输出降-升压模式LED驱动器LT3496EUFD评估板AO-Electron