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1、TITPS6118X白光LED驅(qū)動方案關(guān)鍵詞:電源管理丄ED張動器,TIJPS6118xTI公司的TPS6118X是媒體LCD背景光高度集成的解決方案,有內(nèi)置的集成了1.5A/40C功率MOSFET的高效升壓穩(wěn)壓器,6個高精度屯流和匹配的穩(wěn)壓器,器件支持總數(shù)高達(dá)60個口光LED(WLED).此外,升壓穩(wěn)壓器的輸出能根據(jù)□動WLED的正向壓降來調(diào)整,以捉高效率.TPS6118X的輸入電壓5V到24V,100:1的PWM亮度調(diào)整,可廣泛應(yīng)用于筆記本電腦和UMPCLCD顯示器背景光,以及各種媒體尺寸的LCD顯示器背景光?
2、木文介紹了TPS61180/1/2的主要性能,功能方框圖,典型應(yīng)用電路圖,評估板屯路圖和材料清單(BONM)以及音頻降噪屯路和多種高亮度LED串驅(qū)動電路圖.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