Texas Instruments LP5520 Bruksanvisning
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LP55XX
CALIBRATION
MEMORY
SPI/I2C
INTER-
FACE
BOOSTADC
COLOR AND
BRIGHTNESS
PWM LOGIC
LED
DRIVERS
MCU
WITH
I2C
OR
SPI
-+
C
OUT
C
VDDA
C
VDDD
100 nF4.7 PF
C
IN
2.9 ± 5.5V5 ± 20V
FB
SW
100 nF
2 x
4.7 PF
4.7 PH
L1
ROUT
LP5520
V
DDA
V
DDD
S1_IN
S2_IN
PWMR
PWMG
PWMB
V
LDO
NRST
SS/SDA
SCK/SCL
SI/A0
SO
IFSEL
C
VDDIO
100 nF
V
DDIO
C
VLDO
1 PF
BRC
GND
LM 20
V
LDO
GOUT
BOUT
D1
Product
Folder
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AnIMPORTANTNOTICEattheendofthisdatasheetaddressesavailability,warranty,changes,useinsafety-criticalapplications,
intellectualpropertymattersandotherimportantdisclaimers.PRODUCTIONDATA.
LP5520
SNVS440B–MAY2007–REVISEDMARCH2016
LP5520RGBBacklightLEDDriver
1
1Features
1
•TemperatureCompensatedLEDIntensityand
Color
•IndividualCalibrationCoefficientsforEachColor
•ColorAccuracyΔXandΔY≤0.003
•12-BitADCforMeasurementof2Sensors
•AdjustableCurrentOutputsforRed,Green,and
Blue(RGB)LED
•0.2%TypicalLEDOutputCurrentMatching
•PWMControlInputsforEachColor
•SPI™andI
2
C-CompatibleInterface
•Stand-AloneModeWithOne-WireControl
•SequentialModeforOneColorataTime
•MagneticHighEfficiencyBoostConverter
•ProgrammableOutputVoltagefrom5Vto20V
•AdaptiveOutputVoltageControlOption
•<2-µATypicalShutdownCurrent
2Applications
•ColorLCDDisplayBacklighting
•LEDLightingApplications
3Description
TheLP5520isanRGBbacklightLEDdriverforsmall
formatcolorLCDs.RGBbacklightsenablebetter
colorsonthedisplayandpowersavingscompared
withwhiteLEDbacklights.Thedeviceoffersasmall
andsimpledriversolutionwithoutneedforoptical
feedback.Calibrationindisplaymoduleproduction
canbedoneinonetemperature.TheLP5520
producestruewhitelightoverawidetemperature
range.ThreeindependentLEDdrivershaveaccurate
programmablecurrentsinksandPWMmodulation
control.Usinginternalcalibrationmemoryand
externaltemperaturesensor,theRGBLEDcurrents
areadjustedforperfectwhitebalanceindependentof
thebrightnesssettingortemperature.Theuser
programmablecalibrationmemoryhasintensityvs
temperaturedataforeachcolor.Thiswhitebalance
calibrationdatacanbeprogrammedtothememory
ontheproductionlineofabacklightmodule.
Thedevicehasamagneticboostconverterthat
createsasupplyvoltageofupto20VLEDfromthe
batteryvoltage.Theoutputcanbesetat1-Vsteps
from5Vto20V.Inadaptivemodethecircuit
automaticallyadjuststheoutputvoltagetominimum
sufficientlevelforlowestpowerconsumption.
Temperatureismeasuredusinganexternal
temperaturesensorplacedclosetotheLEDs.The
secondADCinputcanbeused,forexample,for
ambientlightmeasurement.
DeviceInformation
(1)
PARTNUMBERPACKAGEBODYSIZE(MAX)
LP5520DSBGA(25)2.787mm×2.621mm
(1)Forallavailablepackages,seetheorderableaddendumat
theendofthedatasheet.
TypicalApplication
Produktspecifikationer
| Varumärke: | Texas Instruments |
| Kategori: | ej kategoriserat |
| Modell: | LP5520 |
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