Texas Instruments LP8545 Bruksanvisning
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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
1
Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsof
TexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.
2Alltrademarksarethepropertyoftheirrespectiveowners.
PRODUCTIONDATAinformationiscurrentasofpublicationdate.
Copyright©2010–2013,TexasInstrumentsIncorporated
ProductsconformtospecificationsperthetermsoftheTexas
Instrumentsstandardwarranty.Productionprocessingdoesnot
necessarilyincludetestingofallparameters.
Produktspecifikationer
| Varumärke: | Texas Instruments |
| Kategori: | ej kategoriserat |
| Modell: | LP8545 |
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