Texas Instruments LP8863-Q1 Handleiding

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Brightness (%)

Boost Efficiency (%)

0102030405060708090100

75

80

85

90

95

D007

V

OUT

= 29 V

V

OUT

= 36 V

V

OUT

= 42 V

V

OUT

= 46 V

LP8863-Q1

C1P

C1N

CPUMP

GD

ISNS

ISNSGND

FB

EN

INT

BST_SYNC

LED0

LED1

LED2

LED3

LED4

LED5

VSENSE_P

VSENSE_N

SD

V

OUT

PGND

PGND

GD

DISCHARGE

VDD

VLDO

VDDIO

IFSEL

SDO_PWM

SDI_SDA

SCLK_SCL

SS_ADDRSEL

GND

ISET

CPUMP

PWM_FSET

BST_FSET

VIN

VDD

RSD

L1

COUT

RFB1

CIN

D1

RFB2

RSENSE

Q2

Q1

CPUMP

C2x

CVDD

CLDO

RISENSE

RISET

RPWM_FSET

RBST_FSET

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Reference

Design

AnIMPORTANTNOTICEattheendofthisdatasheetaddressesavailability,warranty,changes,useinsafety-criticalapplications,

intellectualpropertymattersandotherimportantdisclaimers.PRODUCTIONDATA.

LP8863-Q1

SNVSAB6B–MARCH2017–REVISEDJULY2018

LP8863-Q1AutomotiveDisplayLED-BacklightDriverWithSix150-mAChannels

1

1Features

1

•QualifiedforAutomotiveApplications

•AEC-Q100QualifiedWiththeFollowingResults:

–DeviceTemperatureGrade1:–40°Cto

+125°CAmbientOperatingTemperature

•InputVoltageOperatingRange3Vto48V

•SixHigh-PrecisionCurrentSinks

–CurrentMatching1%(typical)

–DimmingRatio32000:1Using152-HzLED

OutputPWMFrequency

–Upto16-bitLEDDimmingResolutionWith

SPI,I2C,orPWMInput

–AutomaticallyDetectsUsedLEDStringsand

AdjustsLED-ChannelPhaseShift

–IndependentCurrentControlforEachChannel

•HybridPWMandCurrentDimmingFunction

•Upto47-VV

OUT

BoostorSEPICDC/DC

Controller

–SwitchingFrequency300kHzto2.2MHz

–BoostSpreadSpectrumforReducedEMI

–BoostSyncInputtoSetBoostSwitching

FrequencyFromanExternalClock

–IntegratedChargePumpSupportsLowV

IN

ConditionsSuchasColdCrank

–OutputVoltageAutomaticallyDischarged

WhenBoostisDisabled

•ExtensiveFaultDiagnostics

SimplifiedSchematic

2Applications

•Backlightfor:

–AutomotiveInfotainment

–AutomotiveInstrumentClusters

–SmartMirrors

–Heads-UpDisplays(HUD)

–CentralInformationDisplays(CID)

–Audio-VideoNavigation(AVN)

3Description

TheLP8863-Q1isanautomotivehigh-efficiencyLED

driverwithboostcontroller.Thesixhigh-precision

currentsinkssupportphaseshiftingthatis

automaticallyadjustedbasedonthenumberof

channelsinuse.Currentsinkbrightnesscanbe

controlledindividuallyandgloballythroughtheSPIor

I2Cinterface;brightnesscanalsobeglobally

controlledwithPWMinput.

Theboostcontrollerhasadaptiveoutputvoltage

controlbasedontheheadroomvoltagesoftheLED

currentsinks.Thisfeatureminimizesthepower

consumptionbyadjustingthevoltagetothelowest

sufficientlevelinallconditions.Awide-range

adjustablefrequencyallowstheLP8863-Q1toavoid

disturbanceforAMradioband.

TheLP8863-Q1supportsbuilt-inhybridPWMand

currentdimming,whichreducesEMI,extendsthe

LEDlifetime,andincreasesthetotaloptical

efficiency.

DeviceInformation

(1)

PARTNUMBERPACKAGEBODYSIZE(NOM)

LP8863-Q1HTSSOP(38)9.70mm×4.40mm

(1)Forallavailablepackages,seetheorderableaddendumat

theendofthedatasheet.

SystemEfficiency

Product specificaties