linear ltm8042 umodule led串驱动方案

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1、LinearLTM8042uModuleLED串驱动方案关键词：电源管理,uModule,LED驱动器,DC/DC转换器Linear公司的LTM8042和LTM8042-1是uModuleLED串驱动器,工作电压从3V到30V,具有40VIN瞬态保护,工作模式有升压,降压或降-升压模式,调光比3000:1,可调工作频率从250kHz到2.5MHz,主要用在显示器背光,汽车和飞机照明,照明和扫描仪.本文介绍了LTM8042和LTM8042-1主要特性,方框图以及多种应用电路.LTM8042andLTM80

2、42-1:uModuleLEDStringDriverswith40VINTransientProtectionTheLTMR8042isacompleteμModuleRBoostLEDDriverspecificallydesignedtodriveLEDsupto1A,whiletheLTM8042-1drivesupto350mA.Itcombinesaboostpowertopologywithauniquecurrentlooptooperateasaconstant-currentsour

3、ce.ThePWMinputprovidesasmuchas3000:1LEDdimming,while10:1analogdimmingcanbeaccomplishedbyasingleresistororanalogvoltageappliedtotheCTLpin.Aswithanyboosttopology,theLTM8042/LTM8042-1hasanuninterruptedcurrentpathbetweenitsinputandoutputandisthusintolerantto

4、ashort-circuitoroverloadfromtheoutputtoground.TheLTM8042/LTM8042-1ispackagedinathermallyenhanced,compactovermoldedlandgridarray(LGA)package.TheLTM8042/LTM8042-1isPb-freeandaRoHScompliant.LTM8042和LTM8042-1主要特性:TrueColorPWM™with3000:1DimmingRatioOperatesin

5、Boost,BuckModeorBuck-BoostModeWideInputVoltageRange:Operationfrom3Vto30VTransientProtectionto40VGateDriverforOptionalPWMDimmingwithP-channelMOSFETAdjustableFrequency:250kHzto2.5MHzConstant-CurrentandConstant-VoltageRegulationLowShutdownCurrent:<1μARoHSCo

6、mpliantPackagewithGoldPadFinish2.82mm)SurfaceMountLGAPackage15mmxTiny,LowProfile(9mmxLTM8042和LTM8042-1应用:DisplayBacklightingAutomotiveandAvionicLightingIlluminationAO-Electronics傲壹电子官网：www.aoelectronics.com中文网：www.aoelectronics.cnScanners图1.LTM8042方框图图2.

7、LTM8042驱动6个白光LED(1A)升压应用电路图图3.LTM8042驱动5个白光LED(500mA)带PWM调光的升降压模式应用电路图图4.LTM8042驱动4个白光LED(1A)降压应用电路图图5.LTM8042驱动9个白光LED(100mA)升压应用电路图图6.LTM8042驱动8个白光LED(1A)升压应用电路图