Texas Instruments LP8862-Q1 Bedienungsanleitung

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Brightness (%)

System Efficiency (%)

0102030405060708090100

50

55

60

65

70

75

80

85

90

95

D001

VIN=5V

VIN=8V

VIN=12V

VIN=16V

LP8862-Q1

FB

PWM

OUT1

L1

D1

V

OUT

up to 45 V

4.5...40 V

C

OUT

SD

VSENSE_N

R

ISET

Up to 160 mA/string

SW

LDO

FSET

V

IN

VDDIO/EN

PGND

GND

PAD

VIN

R

ISENSE

ISET

FAULT

VDDIO

FAULT

R

FSET

Q1

R1R2

R

GS

C

LDO

BRIGHTNESS

SYNC

EN

C

IN

C

IN BOOST

OUT2

C

FB

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AnIMPORTANTNOTICEattheendofthisdatasheetaddressesavailability,warranty,changes,useinsafety-criticalapplications,

intellectualpropertymattersandotherimportantdisclaimers.PRODUCTIONDATA.

LP8862-Q1

SNVSA75D–NOVEMBER2015–REVISEDMAY2017

LP8862-Q1Low-EMIAutomotiveLEDDriverWithTwo160-mAChannels

1

1Features

1

•QualifiedforAutomotiveApplications

•AEC-Q100QualifiedWiththeFollowingResults:

–DeviceTemperatureGrade1:–40°Cto

+125°CAmbientOperatingTemperature

•InputVoltageOperatingRange4.5Vto40V

•TwoHigh-PrecisionCurrentSinks

–CurrentMatching1%(Typical)

–LEDStringCurrentupto160mAperChannel

–DimmingRatioof10000:1at100Hz

•IntegratedBoost/SEPICConverterforLEDString

Power

–OutputVoltageupto45V

–SwitchingFrequency300kHzto2.2MHz

–SwitchingSynchronizationInput

–SpreadSpectrumforLowerEMI

•Power-LineFETControlforInrushCurrent

ProtectionandStandbyEnergySaving

•ExtensiveFaultDetectionFeatures

–FaultOutput

–InputVoltageOVP,UVLO,andOCP

–OpenandShortedLEDFaultDetection

–ThermalShutdown

•MinimumNumberofExternalComponents

2Applications

•Backlightfor:

–AutomotiveInfotainment

–AutomotiveInstrumentClusters

–SmartMirrors

–Heads-UpDisplays(HUD)

–CentralInformationDisplays(CID)

–Audio-VideoNavigation(AVN)

SystemEfficiency

3Description

TheLP8862-Q1isanautomotivehigh-efficiency,low-

EMI,easy-to-useLEDdriverwithintegratedDC-DC

converter.TheDC-DCsupportsbothboostand

SEPICmodesofoperation.Thedevicehastwohigh-

precisioncurrentsinksthatcanprovidehighdimming

ratiobrightnesscontrolwithaPWMinputsignal.

Theboost/SEPICconverterhasanadaptiveoutput

voltagecontrolbasedontheLEDcurrentsink

headroomvoltages.Thisfeatureminimizespower

consumptionbyadjustingthevoltagetothelowest

sufficientlevelinallconditions.DC-DCsupports

spreadspectrumforswitchingfrequencyandan

externalsynchronizationwithadedicatedpin.Awide-

rangeadjustablefrequencyallowstheLP8862-Q1to

avoiddisturbanceforAMradioband.

TheinputvoltagerangefortheLP8862-Q1isfrom

4.5Vto40Vtosupportautomotivestop/startand

loaddumpconditions.ThedevicesupportsPWM

brightnessdimmingratioof10000:1for100-Hzinput

PWMfrequency.TheLP8862-Q1integrates

extensivefaultdetectionfeatures.Thedevicehasan

optiontodriveanexternalp-FETtodisconnectthe

inputsupplyfromthesystemintheeventofafault.

Thisfeaturealsoreducesinrushcurrentandstandby

powerconsumption.

DeviceInformation

(1)

PARTNUMBERPACKAGEBODYSIZE(NOM)

LP8862-Q1HTSSOP(20)6.50mm×4.40mm

(1)Forallavailablepackages,seetheorderableaddendumat

theendofthedatasheet.

SimplifiedSchematic

Produktspezifikationen