Texas Instruments LM3447 Bedienungsanleitung

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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.

Produktspezifikationen