Texas Instruments LM3464A Handleiding

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SYNC

DR1

GD1

SE1

VDHC

OutP

VLedFB

CDHC

Faultb

FAULT_CAP

VCC

DIM

Thermal

DMIN

Thermal_Cap

AGNDPGND

ENVIN

PGND

DR2

GD2

SE2

DR3

GD3

SE3

DR4

GD4

SE4

C

FLT

AGND

AGND

Primary power

supply

Voltage

feedback pin

V

RAIL

Voltage

output

Fault acknowledgement output

FAULTb

DIM

PWM dimming input

C

DHC

R

FB1

R

FB2

High Power LED Arrays

Q

1

Q

2

Q

3

Q

4

R

ISNS1

R

ISNS2

R

ISNS3

R

ISNS4

R

DHC

R

THM1

C

VCC

R

THM2

C

THM

R

DMIN2

R

DMIN1

PGNDPGNDPGND

PGND

PGND

NTC thermistor

couple to LED

arrays

To NTC thermal

sensor

A

B

To thermal

sensor

terminals

A

B

External voltage headroom control

VDHC

5V

0V

LM3464/64A

LM3464,LM3464A

www.ti.com

SNVS652F–APRIL2010–REVISEDMAY2013

LEDDriverwithDynamicHeadroomControlandThermalControlInterfaces

CheckforSamples:LM3464,LM3464A

1

FEATURES

DESCRIPTION

TheLM3464/64Aisa4-channelhighvoltagecurrent

2

•WideInputVoltageRange

regulatorthatprovidesasimplesolutionforLED

–12V-80V(LM3464)

lightingapplications.TheLM3464/64Aprovidesfour

–12V-95V(LM3464A)

individualcurrentregulatorchannelsandworksin

conjunctionwithexternalN-channelMOSFETsand

•DynamicHeadroomControlEnsuresMaximum

senseresistorstogiveaccuratedrivingcurrentfor

Efficiency

everyLEDstring.Additionally,theDynamic

•4OutputChannelsWithIndividualCurrent

HeadroomControl(DHC)outputcanbeinterfacedto

Regulation

theexternalpowersupplytoadjusttheLEDsupply

•HighChanneltoChannelAccuracy

voltagetothelowestlevelthatisadequateto

maintainallthestringcurrentsinregulation,yielding

•DigitalPWM/AnalogDimmingControlInterface

theoptimaloverallefficiency.

•ResistorProgrammableDimmingFrequency

DigitalPWMoranalogvoltagesignalscanbeusedto

andMinimumDutyCycle(AnalogDimming

controlthedutycycleoftheallthechannels.When

Mode)

analogcontrolisused,thedimmingfrequencycanbe

•DirectInterfacetoThermalSensor

programmedviaanexternalcapacitor.Aminimum

•FaultDetection

dutycyclecontrolisprovidedintheconditionsthat

theanalogdimmingisconfiguredasthermal

•OverTemperatureProtection

feedback.

•ThermalShutdown

ProtectionfeaturesincludeVINunder-voltagelock-

•UnderVoltageLockout

out,LEDopen/shortcircuitandover-temperaturefault

•ThermalEnhancedTSSOP-28Package

signalingtothesystemcontroller.

APPLICATIONS

•Streetlights

•SolidStateLightingSolutions

TypicalApplication

1

Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsof

TexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.

2Alltrademarksarethepropertyoftheirrespectiveowners.

PRODUCTIONDATAinformationiscurrentasofpublicationdate.

Copyright©2010–2013,TexasInstrumentsIncorporated

ProductsconformtospecificationsperthetermsoftheTexas

Instrumentsstandardwarranty.Productionprocessingdoesnot

necessarilyincludetestingofallparameters.

Product specificaties