Texas Instruments LP8861-Q1 Handleiding
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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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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
Product specificaties
| Merk: | Texas Instruments |
| Categorie: | Niet gecategoriseerd |
| Model: | LP8861-Q1 |
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