Texas Instruments LP8869-Q1 Bedienungsanleitung

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LP8867-Q1

FB

PWM

OUT1

OUT2

OUT3

OUT4

L1

D1

Up to 45 V

VIN

4.5...40 V

C

OUT

C

IN BOOST

SD

VSENSE_N

R

ISET

Up to 120 mA/string

SW

LDO

FSET

VDDIO/EN

SYNC

PGNDGND

PAD

VIN

TSENSE

ISETFAULT

EN

BRIGHTNESS

R

FSET

R1R2

TSET

C

LDO

C

FB

Q1

FAULT

R

ISENSE

R

GS

C

IN

R8

VDDIO

V

LDO

R7

R6

R5

R4

R3

R

Tº

NTC

V

LDO

Output Current (mA)

System Efficiency (%)

80160240320400480

68

72

76

80

84

88

92

96

100

D000

V

IN

= 16V

V

IN

= 12V

V

IN

= 8V

V

IN

= 6V

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AnIMPORTANTNOTICEattheendofthisdatasheetaddressesavailability,warranty,changes,useinsafety-criticalapplications,

intellectualpropertymattersandotherimportantdisclaimers.PRODUCTIONDATA.

LP8867-Q1

,

LP8869-Q1

SNVSB83B–JUNE2019–REVISEDJANUARY2020

LP8867-Q1,LP8869-Q1LowEMIAutomotiveLEDDriverwith4-,3-Channels

1

1Features

1

•AEC-Q100Qualifiedforautomotiveapplications:

–Devicetemperaturegrade1:

–40°Cto+125°C,T

A

•Functionalsafetycapable

–Documentationavailabletoaidfunctional

safetysystemdesign

•3-,4-Channel120-mAcurrentsinks

–Highdimmingratioof10000:1at100Hz

–Currentmatching1%(typical)

–LEDStringcurrentupto120mAperchannel

–Outputscanbecombinedexternallyforhigher

currentperstring

•IntegratedboostandSEPICconverterforLED

stringpower

–Inputvoltageoperatingrange4.5Vto40V

–Outputvoltageupto45V

–Integrated3.3-ASwitchFET

–Switchingfrequency300kHzto2.2MHz

–Switchingsynchronizationinput

–SpreadspectrumforlowerEMI

•Faultdetectionandprotection

–Faultoutput

–InputvoltageOVP,UVLOandOCP

–BoostblockSWOVPandoutputOVP

–LEDopenandshortfaultdetection

–Power-LineFETcontrolforbatterybus

protection

–AutomaticLEDcurrentreductionwithexternal

temperaturesensor

–Thermalshutdown

2Applications

•Backlightfor:

–Automotiveinfotainment

–Automotiveinstrumentclusters

–Smartmirrors

–Heads-updisplays(HUD)

3Description

TheLP8867-Q1,LP8869-Q1isanautomotivehighly-

integrated,low-EMI,easy-to-useLEDdriverwithDC-

DCconverter.TheDC-DCconvertersupportsboth

boostandSEPICmodeoperation.Thedevicehas

fourorthreehigh-precisioncurrentsinksthatcanbe

combinedforhighercurrentcapability.

TheDC-DCconverterhasadaptiveoutputvoltage

controlbasedontheLEDforwardvoltages.This

featureminimizesthepowerconsumptionby

adjustingthevoltagetothelowestsufficientlevelin

allconditions.ForEMIreductionDC-DCsupports

spreadspectrumforswitchingfrequencyandan

externalsynchronizationwithdedicatedpin.Awide-

rangeadjustablefrequencyallowstheLP886x-Q1to

avoiddisturbanceforsensitivefrequencyband.

TheinputvoltagerangefortheLP886x-Q1isfrom

4.5Vto40Vtosupportautomotivestart-stopand

loaddumpcondition.TheLP886x-Q1integrates

extensivefaultdetectionfeatures.

DeviceInformation

(1)

PARTNUMBERPACKAGEBODYSIZE(NOM)

LP8867-Q1

HTSSOP(20)6.50mm×4.40mm

LP8869-Q1

(1)Forallavailablepackages,seetheorderableaddendumat

theendofthedatasheet.

SimplifiedSchematic

LEDBacklightEfficiency

Produktspezifikationen