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TI TPS6118x白光LED驱动方案
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TI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个高精度电流和匹配的稳压器,器件支持总数高达60个白光LED(WLED).此外,升压稳压器的输出能根据自动WLED的正向压降来调整,以提高效率.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.本文介绍了TPS61180/1/2的主要性能,功能方框图,典型应用电路图,评估板电路图和材料清单(BONM)以及音频降噪电路和多种高亮度LED串驱动电路图.

TheTPS61180/1/2ICsprovidehighlyintegratedsolutionsformediasizeLCDbacklight.Thesedeviceshaveabuilt-inhighefficiencyboostregulatorwithintegrated1.5A/40VpowerMOSFET.Thesixcurrentsinkregulatorsprovidehighprecisioncurrentregulationandmatching.Intotal,thedevicecansupportupto60WLED.Inaddition,theboostoutputautomaticallyadjustsitsvoltagetotheWLEDforwardvoltagetoimproveefficiency.

Thedevicessupportpulsewidthmodulation(PWM)brightnessdimming.Duringdimming,theWLEDcurrentisturnedon/offatthedutycycleandfrequencydeterminedbythePWMsignalinputontheDCRTLpin.OnepotentialissueofPWMdimmingisaudiblenoisesfromtheoutputceramiccapacitors.TheTPS61180/1/2familyisdesignedtominimizethisoutputACrippleacrossawidedimmingdutycycleandfrequencyrange;and,thereforereducetheaudiblenoise.

TheTPS61180/1/2ICsprovideadriveroutputforanexternalPFETconnectedbetweentheinputandinductor.Duringshortcircuitorover-currentconditions,theICsturnofftheexternalPFETanddisconnectthebatteryfromtheWLEDs.ThePFETisalsoturnedoffduringICshutdown(trueshutdown)topreventanyleakagecurrentofthebattery.Thedevicealsointegratesover-voltageprotection,soft-startandthermalshutdown.

TheTPS61180ICrequiresexternal3.3VICsupply,whileTPS61181andTPS61182ICshaveabuilt-inlinearregulatorfortheICsupply.Allthedevicesareina3×3mmQFNpackage.

TPS6118x主要特性:
5Vto24VInputVoltage
Integrated1.5A40VMOSFET
1.0MHz/1.3MHzSwitchingFrequency
BoostOutputAuto-AdaptivetoWLEDVoltages
SmallExternalComponents
IntegratedLoopCompensation
SixCurrentSinkof25mA
Upto10WLEDinSeries
LessThan3%CurrentMatchingandAccuracy
100:1PWMBrightnessDimmingRange
MinimizedOutputRippleUnderPWMDimming
DriverforInput/OutputIsolationPFET
TrueShutdown
OverVoltageProtection
WLEDOpen/ShortProtection
Built-inSoftStart
16L3mm×3mmQFN
TPS6118x应用:
NotebookLCDDisplayBacklight
UMPCLCDDisplayBacklight
BacklightforMediaFormFactorLCDdisplay



图1.TPS6118x功能方框图



图2.TPS61181/1典型应用电路图



图3.TPS6118x评估板电路图



表1.TPS6118x评估板元件清单(BOM)


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