Texas Instruments LP8553 Bedienungsanleitung
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MCU
LP8553
SW
FB
V
LDO
GNDs
EN
ISET
V
DDIO
PWM
SCLK
SDA
OUT1
OUT2
OUT3
OUT4
L1D1
10V ± 40V
5.5V ± 22V
FILTER
5V
FSET
15 éH
VSYNC
210 mA ± 400 mA
C
OUT
C
IN
10 éF
4.7 éF
C
VLDO
1 éF
V
DDIO
reference voltage
VSYNC signal
120 k5
100 nF
1 éF
FAULT
Can be left floating
if not used
39 pF
VIN
R
ISET
R
FSET
V
BATT
LP8553
www.ti.com
SNVS701B–SEPTEMBER2011–REVISEDJANUARY2014
LP8553High-EfficiencyLEDBacklightDriverforNotebooks
CheckforSamples:LP8553
1
FEATURES
APPLICATIONS
2
•High-VoltageDC/DCBoostConverterwith
•NotebookandNetbookLCDDisplayLED
IntegratedFETwithFourSwitchingFrequencyBacklight
Options:156/312/625/1250kHz
•LEDLighting
•2.7Vto22VInputVoltageRangetoSupport
1x…5xCellLi-IonBatteriesDESCRIPTION
TheLP8553isawhiteLEDdriverwithintegrated
•ProgrammablePWMResolution
boostconverter.Ithasfouradjustablecurrentsinks
–8to13TrueBit(SteadyState)
whichcanbecontrolledbyPWMinputorwithI
2
C-
–Additional1to3BitsUsingDithering
compatibleserialinterface.
DuringBrightnessChanges
Theboostconverterhasadaptiveoutput-voltage
•I
2
CandPWMBrightnessControl
controlbasedontheLEDdrivervoltages.This
•AutomaticPWM&CurrentDimmingfor
featureminimizesthepowerconsumptionby
ImprovedEfficiency
adjustingthevoltagetolowestsufficientlevelinall
conditions.
•PWMOutputFrequencyandLEDCurrentSet
ThroughResistors
LEDoutputshave8-bitcurrentresolutionandupto
13-bitPWMresolutionwithadditional1-3bitdithering
•OptionalSynchronizationtoDisplayV
SYNC
toachievesmoothandprecisebrightnesscontrol.
Signal
ProprietaryPhaseShiftPWMcontrolisusedforLED
•4LEDOutputswithLEDFault(Short/Open)
outputstoreducepeakcurrentfromtheboost
Detection
converter,thusmakingtheboostcapacitorssmaller.
•LowInputVoltage,Over-Temperature,Over-
ThePhaseShiftingschemealsoeliminatesaudible
noise.
CurrentDetectionandShutdown
•MinimumNumberofExternalComponents
•DSBGA25-BumpPackage,2.466x2.466x
0.6mm
TypicalApplication(1)
1
Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsof
TexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.
2Alltrademarksarethepropertyoftheirrespectiveowners.
PRODUCTIONDATAinformationiscurrentasofpublicationdate.
Copyright©2011–2014,TexasInstrumentsIncorporated
ProductsconformtospecificationsperthetermsoftheTexas
Instrumentsstandardwarranty.Productionprocessingdoesnot
necessarilyincludetestingofallparameters.
Produktspezifikationen
| Marke: | Texas Instruments |
| Kategorie: | Nicht kategorisiert |
| Modell: | LP8553 |
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