Texas Instruments LM5642X Bedienungsanleitung

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V

IN

4.5V - 36V

SS/ON1

SS/ON2

SYNC

UV_Delay

Vout1

1.3V-0.9V

IN

Vout2

1.3V-0.9V

IN

LM5642/LM5642X

LM5642,LM5642X

www.ti.com

SNVS219K–JUNE2003–REVISEDAPRIL2013

LM5642/LM5642XHighVoltage,DualSynchronousBuckConverterwithOscillator

Synchronization

CheckforSamples:LM5642,LM5642X

1

FEATURES

DESCRIPTION

TheLM5642seriesconsistsoftwocurrentmode

2

•TwoSynchronousBuckRegulators

synchronousbuckregulatorcontrollersoperating

•180°OutofPhaseOperation

180°outofphasewitheachotheratanormal

•200kHzFixedNominalFrequency:LM5642

switchingfrequencyof200kHzfortheLM5642andat

375kHzfortheLM5642X.

•375kHzFixedNominalFrequency:LM5642X

•SynchronizableSwitchingFrequencyfrom150

OutofphaseoperationreducestheinputRMSripple

current,therebysignificantlyreducingtherequired

kHzto250kHzfortheLM5642and200kHzto

inputcapacitance.Theswitchingfrequencycanbe

500kHzfortheLM5642X

synchronizedtoanexternalclockbetween150kHz

•4.5Vto36VInputRange

and250kHzfortheLM5642andbetween200kHz

•50µAShutdownCurrent

and500kHzfortheLM5642X.Thetwoswitching

regulatoroutputscanalsobeparalleledtooperateas

•AdjustableOutputfrom1.3Vto90%ofVin

adual-phase,singleoutputregulator.

•0.04%(Typical)LineandLoadRegulation

Accuracy

Theoutputofeachchannelcanbeindependently

adjustedfrom1.3Vto90%ofVin.Aninternal5Vrail

•CurrentModeControlwithorwithoutaSense

isalsoavailableexternallyfordrivingbootstrap

Resistor

circuitry.

•IndependentEnable/Soft-startPinsAllow

Current-modefeedbackcontrolassuresexcellentline

SimpleSequentialStartupConfiguration.

andloadregulationandwideloopbandwidthfor

•ConfigurableforSingleOutputParallel

excellentresponsetofastloadtransients.Currentis

Operation.(SeeFigure4)

sensedacrosseithertheVdsofthetopFETor

•AdjustableCycle-by-cycleCurrentLimit

acrossanexternalcurrent-senseresistorconnected

inserieswiththedrainofthetopFET.

•InputUnder-voltageLockout

•OutputOver-voltageLatchProtection

TheLM5642featuresanalogsoft-startcircuitrythatis

independentoftheoutputloadandoutput

•OutputUnder-voltageProtectionwithDelay

capacitancemakingthesoft-startbehaviormore

•ThermalShutdown

predictableandcontrollablethantraditionalsoft-start

•SelfDischargeofOutputCapacitorswhenthe

circuits.

RegulatorisOFF

Over-voltageprotectionisavailableforbothoutputs.

•TSSOPandHTSSOP(ExposedPAD)Packages

AUV-Delaypinisalsoavailabletoallowdelayedshut

offtimefortheICduringanoutputunder-voltage

APPLICATIONS

event.

•EmbeddedComputerSystems

TypicalApplicationCircuit

•NavigationSystems

•TelecomSystems

•Set-TopBoxes

•WebPAD

•PointOfLoadPowerArchitectures

1

Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsof

TexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.

2Alltrademarksarethepropertyoftheirrespectiveowners.

PRODUCTIONDATAinformationiscurrentasofpublicationdate.

Copyright©2003–2013,TexasInstrumentsIncorporated

ProductsconformtospecificationsperthetermsoftheTexas

Instrumentsstandardwarranty.Productionprocessingdoesnot

necessarilyincludetestingofallparameters.

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