Texas Instruments LP8543 Bedienungsanleitung

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LP8543

www.ti.com

SNVS604D–AUGUST2009–REVISEDMARCH2013

SMBus/I2CControlledWLEDDriverforMedium-SizedLCDBacklight

CheckforSamples:LP8543

1

FEATURES

DESCRIPTION

TheLP8543isawhiteLEDdriverwithintegrated

2

•High-VoltageDC/DCBoostConverterwith

boostconverter.Ithas7adjustablecurrentsinks

IntegratedFET

whichcanbecontrolledbySMBusorI

2

C-compatible

•5.5Vto22VInputVoltageRangetoSupport2x,

serialinterface,PWMinputandAmbientLightSensor

3xand4xLi-IonBatteries.

(ALS).

•PWMPhaseShiftControlwithAdaptiveBoost

Theboostconverterhasadaptiveoutputvoltage

OutputtoIncreaseEfficiencyComparedto

controlbasedontheLEDdrivervoltages.This

ConventionalBoostConvertersTopologies

featureminimizesthepowerconsumptionby

•PWMBrightnessControlforSingleWireadjustingthevoltagetolowestsufficientlevelinall

conditions.PhaseShiftPWMdimmingoffersfurther

ControlandStand-AloneUse

powersavingespeciallywhenthereispoormatching

•DigitalAmbientLightSensorInterfacewith

intheforwardvoltagesoftheLEDstrings.Boost

User-ProgrammedAmbientLighttoBacklight

voltagecanalsobecontrolledthroughthe

BrightnessCurve

SMBus/I

2

C.

•Easy-to-UseEEPROMCalibrationforCurrent,

InternalEEPROMstoresthedataforbacklight

IntensityandAmbientLightResponseSetting

brightnessandambientlightsensorcalibration.

•SevenLEDDriverswithLEDFault

Brightnesscanbecalibratedduringthebacklightunit

(Short/open)Detection

productionsothatallunitsproducethesame

brightness.EEPROMalsostoresthecoefficientsfor

•Eight-BitLEDCurrentControl

theLEDcontrolequationsandthedefaultLED

•InternalThermalProtectionandBacklight

currentvalue.LEDcurrenthas8–bitadjustmentfrom

SafetyDimmingFeature

0to60mA.

•TwoWire,SMBus/I

2

C-CompatibleControl

TheLP8543hasseveralsafetyanddiagnostic

Interface

features.Low-inputvoltagedetectionturnsthechip

•Low-InputVoltageDetectionandShutdown

offifthesystemgetsstuckandbatteryfully

discharges.Inputvoltagedetectionthresholdis

•MinimumNumberofExternalComponents

adjustablefordifferentbatteryconfigurations.

•WQFN24-PinPackage,4x4x0.8mm

Thermalregulationreducesbacklightbrightness

aboveasettemperature.LEDfaultdetectionreports

APPLICATIONS

openorLEDshortfault.Boostover-currentfault

•MediumSized(>10inches)LCDDisplay

detectionprotectsthechipincaseofover-current

event.

Backlight

•LEDLighting

LP8543isavailableintheWQFN24-pinpackage.

1

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TexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.

2Alltrademarksarethepropertyoftheirrespectiveowners.

PRODUCTIONDATAinformationiscurrentasofpublicationdate.

Copyright©2009–2013,TexasInstrumentsIncorporated

ProductsconformtospecificationsperthetermsoftheTexas

Instrumentsstandardwarranty.Productionprocessingdoesnot

necessarilyincludetestingofallparameters.

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