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Plan of drive of LED of TI TPS6118x Bai Guang
From;    Author:Stand originally
The TPS6118x of TI company is the solution with compositive height of media LCD bias light compensation, have inside of buy compositive the manostat of efficient step up of 1.5A/40C power MOSFET, electric current of 6 high accuracy and the manostat that match, parts of an apparatus supports gross to be as high as LED(WLED) of 60 Bai Guang. In addition, the output of step up manostat can according to automatic WLED to pressure fall to adjust, arrive in order to raise the input voltage 5V of efficiency.TPS6118x 24V, 100:1PWM brightness is adjusted, can apply extensively at notebook computer and UMPCLCD monitor bias light compensation, and the LCD monitor bias light compensation of all sorts of media dimension. The article introduced the main function of TPS61180/1/2, functional block diagram, representative application circuit pursues, evaluate board circuit graph and material detailed list (BONM) and frequency fall circuit of a confusion of voices strings together drive circuit to pursue with a variety of tall brightness LED.

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

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

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

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

TPS6118x major attribute:
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 application:
NotebookLCDDisplayBacklight
UMPCLCDDisplayBacklight
BacklightforMediaFormFactorLCDdisplay



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