Texas Instruments LP8861-Q1 Bedienungsanleitung

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020406080100

System efficiency (%)

Brightness (%)

VIN=5V

VIN=8V

VIN=12V

VIN=16V

C010

LP8861-Q1

FB

PWM

OUT1

OUT2

OUT3

OUT4

L1

D1

Up to 45 V

VIN

4.5...40 V

C

OUT

SD

VSENSE_N

R

ISET

Up to 100 mA/string

SW

LDO

FSET

VDDIO/EN

SYNC

PGND

GND

PAD

VIN

ISET

FAULT

EN

BRIGHTNESS

R

FSET

R1R2

C

LDO

C

FB

R

ISENSE

Q1

R

GS

C

IN

C

IN BOOST

R3

R5

R

Tº

NTC

R4

R6

R7

V

LDO

TSENSE

TSET

V

LDO

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Folder

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Support &

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Reference

Design

AnIMPORTANTNOTICEattheendofthisdatasheetaddressesavailability,warranty,changes,useinsafety-criticalapplications,

intellectualpropertymattersandotherimportantdisclaimers.PRODUCTIONDATA.

LP8861-Q1

SNVSA50C–AUGUST2015–REVISEDMAY2017

LP8861-Q1Low-EMIAutomotiveLEDDriverWithFour100-mAChannels

1

1Features

1

•QualifiedforAutomotiveApplications

•AECQ100QualifiedWiththeFollowingResults:

–DeviceTemperatureGrade1:–40°Cto

+125°CAmbientOperatingTemperature

•InputVoltageOperatingRange4.5Vto40V

•FourHigh-PrecisionCurrentSinks

–CurrentMatching1%(Typical)

–LEDStringCurrentupto100mA/Channel

–DimmingRatioof10000:1at100Hz

•IntegratedBoost/SEPICConverterforLEDString

Power

–OutputVoltageupto45V

–SwitchingFrequency300kHzto2.2MHz

–SwitchingSynchronizationInput

–SpreadSpectrumforLowerEMI

•Power-LineFETControlforInrushCurrent

ProtectionandStandbyEnergySaving

•ExtensiveFaultDetectionandToleranceFeatures

–FaultOutput

–InputVoltageOVP,UVLO,andOCP

–OpenandShortedLEDFaultDetection

–AutomaticLEDCurrentReductionWith

ExternalTemperatureSensor

–ThermalShutdown

•MinimumNumberofExternalComponents

2Applications

•Backlightfor:

–AutomotiveInfotainment

–AutomotiveInstrumentClusters

–SmartMirrors

–Heads-UpDisplays(HUD)

–CentralInformationDisplays(CID)

–Audio-VideoNavigation(AVN)

SystemEfficiency

3Description

TheLP8861-Q1isanautomotivehigh-efficiency,low-

EMI,easy-to-useLEDdriverwithintegrated

boost/SEPICconverter.Ithasfourhigh-precision

currentsinksthatcanprovidehighdimmingratio

brightnesscontrolwithaPWMinputsignal.

Theboost/SEPICconverterhasadaptiveoutput

voltagecontrolbasedontheLEDcurrentsink

headroomvoltages.Thisfeatureminimizesthepower

consumptionbyadjustingthevoltagetolowest

sufficientlevelinallconditions.Theboost/SEPIC

convertersupportsspreadspectrumforswitching

frequencyandanexternalsynchronizationwith

dedicatedpin.Awide-rangeadjustablefrequency

allowstheLP8861-Q1toavoiddisturbanceforAM

radioband.

TheLP8861-Q1hasanoptiontodriveanexternalp-

FETtodisconnecttheinputsupplyfromthesystemin

theeventofafaultandreduceinrushcurrentand

standbypowerconsumption.Thedevicecanreduce

LEDcurrentbasedontemperaturemeasuredwith

externalNTCsensortoprotectLEDfromoverheating

andextendLEDlifetime.

TheinputvoltagerangefortheLP8861-Q1isfrom

4.5Vto40Vtosupportautomotivestop/startand

loaddumpcondition.TheLP8861-Q1integrates

extensivefaultdetectionandprotectionfeatures.

DeviceInformation

(1)

PARTNUMBERPACKAGEBODYSIZE(NOM)

LP8861-Q1TSSOP(20)6.50mm×4.50mm

(1)Forallavailablepackages,seetheorderableaddendumat

theendofthedatasheet.

SimplifiedSchematic

Produktspezifikationen