TITPS6118x白光LED驱动方案

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1、TITPS6118X白光LED驱动方案关键词：电源管理丄ED张动器,TIJPS6118xTI公司的TPS6118X是媒体LCD背景光高度集成的解决方案，有内置的集成了1.5A/40C功率MOSFET的高效升压稳压器,6个高精度屯流和匹配的稳压器，器件支持总数高达60个口光LED(WLED).此外，升压稳压器的输出能根据□动WLED的正向压降来调整，以捉高效率.TPS6118X的输入电压5V到24V,100:1的PWM亮度调整，可广泛应用于笔记本电脑和UMPCLCD显示器背景光，以及各种媒体尺寸的LCD显示器背景光•

2、木文介绍了TPS61180/1/2的主要性能，功能方框图，典型应用电路图，评估板屯路图和材料清单(BONM)以及音频降噪屯路和多种高亮度LED串驱动电路图.TheTPS61180/1/2ICsprovidehighlyintegratedsolutionsformediasizeLCDbacklight.Thesedeviceshaveabuilt-inhighefficiencyboostregulatorwithintegrated1.5A/40VpowerMOSFET.Thesixcurrentsinkreg

3、ulatorsprovidehighprecisioncurrentregulationandmatching.Intotal,thedevicecansupportupto60WLED.Inaddition,theboostoutputautomaticallyadjustsitsvoltagetotheWLEDforwardvoltagetoimproveefficiency.Thedevicessupportpulsewidthmodulation(PWM)brightnessdimming.Duringdi

4、mming,theWLEDcurrentisturnedon/offatthedutycycleandfrequencydeterminedbythePWMsignalinputontheDCRTLpin.OnepotentialissueofPWMdimmingisaudiblenoisesfromtheoutputceramiccapacitors.TheTPS61180/1/2familyisdesignedtominimizethisoutputACrippleacrossawidedimmingdutyc

5、ycleandfrequencyrange;and,thereforereducetheaudiblenoise.TheTPS61180/1/2ICsprovideadriveroutputforanexternalPFETconnectedbetweentheinputandinductor.Duringshortcircuitorover-currentconditions,theICsturnofftheexternalPFETanddisconnectthebatteryfromtheWLEDs.ThePF

6、ETisalsoturnedoffduringICshutdown(trueshutdown)topreventanyleakagecurrentofthebattery.Thedevicealsointegratesover-voltageprotection,soft-startandthermalshutdown.TheTPS61180ICrequiresexternal3.3VICsupply,whileTPS61181andTPS61182ICshaveabuilt-inlinearregulatorfo

7、rtheICsupply.Allthedevicesareina3x3mmQFNpackage.TPS6118X主要特性：5Vto24VInputVoltageIntegrated1.5A40VMOSFET1.0MHz/1.3MHzSwitchingFrequencyBoostOutputAuto-AdaptivetoWLEDVoltagesSmallExternalComponentsIntegratedLoopCompensationSixCurrentSinkof25mAUpto10WLEDinSeriesL

8、essThan3%CurrentMatchingandAccuracy100:1PWMBrightnessDimmingRangeMinimizedOutputRippleUnderPWMDimmingDriverforInput/OutputIsolationPFETTrueShutdownOverVoltageProtectionWLEDOpen/Sho