Texas Instruments LM3530 Handleiding

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SW

IN

OVP

ILED

SCL

SDA

GND

ALS1

C

IN

LM3530

2.7V to 5.5V

Up to 40V

L

D1

ALS2

HWEN

VIN

VIN

Ambient Light

Sensor

Ambient Light

Sensor

INT

PWM

10 k:

V

LOGIC

10 k:10 k:10 k:

C

OUT

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Folder

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LM3530

SNVS606L–JUNE2009–REVISEDDECEMBER2014

LM3530High-EfficiencyWhite-LEDDriverwithProgrammableAmbientLightSensing

CapabilityandI

2

C-CompatibleInterface

1Features3Description

TheLM3530currentmodeboostconvertersupplies

1

•Drivesupto11LEDsinseries

thepowerandcontrolsthecurrentinupto11series

•1000:1DimmingRatio

whiteLEDs.The839-mAcurrentlimitand2.7-Vto

•90%Efficient

5.5-Vinputvoltagerangemakethedeviceaversatile

backlightpowersourceidealforoperationinportable

•ProgrammableDualAmbientLightSensorInputs

applications.

withInternalALSVoltageSettingResistors

•I

2

CProgrammableLogarithmicorLinear

TheLEDcurrentisadjustablefrom0mAto29.5mA

viaanI

2

C-compatibleinterface.The127different

BrightnessControl

currentstepsand8differentmaximumLEDcurrent

•ExternalPWMInputforSimpleBrightness

levelsgiveover1000programmableLEDcurrent

Adjustment

levels.Additionally,PWMbrightnesscontrolis

•TrueShutdownIsolationforLEDsandAmbient

possiblethroughanexternallogiclevelinput.

LightSensors

ThedevicealsofeaturestwoAmbientLightSensor

•InternalSoft-StartLimitsInrushCurrent

inputs.Thesearedesignedtomonitoranalogoutput

•Wide2.7-Vto5.5-VInputVoltageRange

ambientlightsensorsandprovideprogrammable

adjustmentoftheLEDcurrentwithchangesin

•40-Vand25-VOvervoltageProtectionOptions

ambientlight.Eachambientlightsensorinputhas

•500-kHzFixedFrequencyOperation

independentlyprogrammableinternalvoltagesetting

•839-mAPeakCurrentLimit

resistorswhichcanbemadehighimpedanceto

reducepowerduringshutdown.The500-kHz

2Applications

switchingfrequencyallowsforhighconverter

efficiencyoverawideoutputvoltagerange

•SmartphoneLCDBacklighting

accommodatingfrom2to11seriesLEDs.Finally,the

•PersonalNavigationLCDBacklighting

supportofContentAdjustedBacklightingmaximizes

•2to11SeriesWhite-LEDBacklitDisplayPower

batterylifewhilemaintainingdisplayimagequality.

Source

TheLM3530operatesoverthe−40°Cto85°C

space

temperaturerange.

DeviceInformation

(1)

PARTNUMBERPACKAGEBODYSIZE(MAX)

LM3530DSBGA(12)1.64mmx1.24mm

(1)Forallavailablepackages,seetheorderableaddendumat

theendofthedatasheet.

SimplifiedSchematic

1

AnIMPORTANTNOTICEattheendofthisdatasheetaddressesavailability,warranty,changes,useinsafety-criticalapplications,

intellectualpropertymattersandotherimportantdisclaimers.PRODUCTIONDATA.

Product specificaties