Texas Instruments LP8545 Bedienungsanleitung

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LP8545

www.ti.com

SNVS635D–APRIL2010–REVISEDDECEMBER2013

High-EfficiencyLEDBacklightDriverforNotebooks

CheckforSamples:LP8545

1

FEATURES

DESCRIPTION

TheLP8545isawhiteLEDdriverwithintegrated

2

•High-VoltageDC/DCBoostConverterwith

boostconverter.Ithassixadjustablecurrentsinks

IntegratedFETwithFourSwitchingFrequency

whichcanbecontrolledbyPWMinputorwithI

2

C-

Options:156/312/625/1250kHz

compatibleserialinterface.

•ConfigurableforUsewithExternalFETfor

Theboostconverterhasadaptiveoutputvoltage

ApplicationsNeedingHigherOutputVoltage

controlbasedontheLEDdrivervoltages.This

•2.7V–22VInputVoltageRangetoSupport

featureminimizesthepowerconsumptionby

1x…5xCellLi-IonBatteries

adjustingthevoltagetolowestsufficientlevelinall

•ProgrammablePWMResolutionconditions.

–8to13TrueBit(SteadyState)

LEDoutputshave8-bitcurrentresolutionandupto

13-bitPWMresolutionwithadditional1-3bitdithering

–Additional1to3BitsUsingDithering

toachievesmoothandprecisebrightnesscontrol.

DuringBrightnessChanges

ProprietaryPhaseShiftPWMcontrolisusedforLED

•I

2

CandPWMBrightnessControl

outputstoreducepeakcurrentfromtheboost

•PWMOutputFrequencyandLEDCurrentSet

converter,thusmakingtheboostcapacitorssmaller.

ThroughResistors

ThePhaseShiftingschemealsoeliminatesaudible

noise.

•OptionalSynchronizationtoDisplayV

SYNC

Signal

InternalEEPROMisusedforstoringtheconfiguration

data.Thismakesitpossibletohaveminimum

•6LEDOutputswithLEDfault(Short/Open)

externalcomponentcountandmakethesolutionvery

Detection

small.

•LowInputVoltage,Over-Temperature,Over-

CurrentDetectionandShutdown

LP8545hassafetyfeatureswhichmakeitpossibleto

detectLEDoutputswithopenorshortfault.Aswell

•MinimumNumberofExternalComponents

lowinputvoltageandboostover-currentconditions

•WQFN24-PinPackage,4x4x0.8mm

aremonitoredandchipisturnedoffincaseofthese

events.Thermalde-ratingfunctionprevents

APPLICATIONS

overheatingofthedevicebyreducingbacklight

brightnesswhensettemperaturehasbeenreached.

•NotebookandNetbookLCDDisplayLED

Backlight

LP8545isavailableinTI'sWQFN24-pinpackage.

•LEDLighting

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Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsof

TexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.

2Alltrademarksarethepropertyoftheirrespectiveowners.

PRODUCTIONDATAinformationiscurrentasofpublicationdate.

Copyright©2010–2013,TexasInstrumentsIncorporated

ProductsconformtospecificationsperthetermsoftheTexas

Instrumentsstandardwarranty.Productionprocessingdoesnot

necessarilyincludetestingofallparameters.

Produktspezifikationen