Texas Instruments LM36922H Handleiding
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V
OUT
(Up to 38V)
IN
SWOVP
LED1
LED2
GND
V
BATT
HWEN
LM36922H
PWM
SDA
SCL
V
IO
ASEL
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AnIMPORTANTNOTICEattheendofthisdatasheetaddressesavailability,warranty,changes,useinsafety-criticalapplications,
intellectualpropertymattersandotherimportantdisclaimers.PRODUCTIONDATA.
LM36922H
SNVSAF2A–FEBRUARY2016–REVISEDFEBRUARY2016
LM36922HHighlyEfficientDual-StringWhiteLEDDriver
1
1Features
1
•1%MatchedCurrentSinksAcrossProcess,
Voltage,Temperature
•3%Current-SinkAccuracyAcrossProcess,
Voltage,Temperature
•11-BitDimmingResolution
•Upto90%SolutionEfficiency
•DrivesfromOnetoTwoParallelLEDStringsatup
to38Vat25mAperString
•PWMDimmingInput
•I
2
CProgrammable
•Selectable500-kHzand1-MHzSwitching
FrequencyWithOptional–12%shift
•AutoSwitchFrequencyMode(250kHz,500kHz,
1MHz)
•FourConfigurableOvervoltageProtection
Thresholds(17V,24V,31V,38V)
•FourConfigurableOvercurrentProtection
Thresholds(750mA,1000mA,1250mA,
1500mA)
•ThermalShutdownProtection
•ExternallySelectableI
2
CAddressOptionsvia
ASELInput
2Applications
•PowerSourceforSmartPhoneandTablet
Backlighting
•LCDPanelsWithupto24LEDs
3Description
TheLM36922Hisanultra-compact,highlyefficient,
two-stringwhite-LEDdriverdesignedforLCDdisplay
backlighting.Thedevicecanpowerupto12series
LEDsatupto25mAperstring.Anadaptivecurrent
regulationmethodallowsfordifferentLEDvoltagesin
eachstringwhilemaintainingcurrentregulation.
TheLEDcurrentisadjustedviaanI
2
Cinterfaceor
throughalogiclevelPWMinput.ThePWMdutycycle
isinternallysensedandmappedtoan11-bitcurrent
thusallowingforawiderangeofPWMfrequencies
withnoise-freeoperationfrom50µAto25mA.
Otherfeaturesincludeanauto-frequencymode,
whichcanautomaticallychangethefrequencybased
onloadcurrentinordertooptimizeefficiency.
Thedeviceoperatesoverthe2.5-Vto5.5-Vinput
voltagerangeanda–40°Cto+85°Ctemperature
range.
DeviceInformation
(1)
PARTNUMBERPACKAGEBODYSIZE(MAX)
LM36922HDSBGA(12)1.756mm×1.355mm
(1)Forallavailablepackages,seetheorderableaddendumat
theendofthedatasheet.
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SimplifiedSchematic
TypicalString-to-StringMatchingvsLEDCurrent
Product specificaties
| Merk: | Texas Instruments |
| Categorie: | Niet gecategoriseerd |
| Model: | LM36922H |
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