Texas Instruments LM3447 Handleiding
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VAC
TSNS
LM3447
FLT1
FLT2
BIAS
HOLD
AUX
VCC
FF
INV
COMP
GATE
ISNS
GND
+
–
+
–
LM3447
www.ti.com
SNOSC65A–APRIL2012–REVISEDMAY2012
PhaseDimmable,PrimarySidePowerRegulatedPFCFlybackControllerforLEDLighting
CheckforSamples:LM3447
1
FEATURES
DESCRIPTION
TheLM3447isaversatilepowerfactorcorrection
•IntegratedPhaseAngleDecode
(PFC)controllerdesignedtomeettheperformance
–LeadingandTrailingEdgeCompatible
requirementsofresidentialandcommercialphase-cut
–Over50:1DimmingRange
dimmercompatibleLEDlampdrivers.Thedevice
incorporatesaphasedecodercircuitandan
•PowerFactorCorrectionwithLowTotal
adjustableholdcurrentcircuittoprovidesmooth,
HarmonicDistortion
flickerfreedimmingoperation.Aproprietaryprimary
•PrimarySideControlUsingInputVoltage
sidecontroltechniquebasedoninputvoltage
FeedforwardTechnique
feedforwardisusedtoregulatetheinputpower
•InputPowerRegulationSchemewithImproved
drawnbytheLEDdriverandtoachieveline
regulationoverawiderangeofinputvoltage.Valley
LineRegulation
switchingoperationisimplementedtominimize
•ConstantPowerOperationofLEDsto
switchinglossandreduceEMI.Aninternalthermal
CompensateforForwardVoltageVariations
foldbackcircuitisprovidedtoprotectstheLEDsfrom
OverTemperatureandLifetime
damagebasedonthetemperaturesensedbya
•FixedFrequencyDiscontinuousConduction
singleexternalNTCresistor.Additionalfeatures
ModeOperation
includeLEDopencircuitandshortcircuitprotection,
cycle-by-cycleFETover-currentprotection,burst
•ValleySwitchingOperationtoAchieveHigh
modefaultoperationusinganinternal812msfault
EfficiencyandLowEMI
timerandinternalthermalshutdown.
•EfficientTRIACHoldCurrentManagement
TheLM3447isidealforimplementingdimmable,
•ThermalFoldbackFunctionforLEDProtection
isolatedsinglestageLEDlampdriverswhere
•LEDOpenCircuitandShortCircuitProtection
simplicity,low-componentcountandsmallsolution
sizeareofprimaryimportance.Thisdeviceis
APPLICATIONS
currentlyavailableinaTSSOP14-pinpackage.
•DimmableA19,R20,PAR30/38LEDLamps
•RecessedLEDDownlightsandPendantLights
•IndustrialandCommercialSolidStateLighting
TYPICALAPPLICATIONDIAGRAM
1
Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsof
TexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.
PRODUCTIONDATAinformationiscurrentasofpublicationdate.
Copyright©2012,TexasInstrumentsIncorporated
ProductsconformtospecificationsperthetermsoftheTexas
Instrumentsstandardwarranty.Productionprocessingdoesnot
necessarilyincludetestingofallparameters.
Product specificaties
| Merk: | Texas Instruments |
| Categorie: | Niet gecategoriseerd |
| Model: | LM3447 |
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