Texas Instruments LM5642X Handleiding
Pagina's 44 Niet gecategoriseerd
Bekijk de handleiding van Texas Instruments LM5642X gratis online of download de PDF. Deze handleiding is 3 keer bekeken. Vraag over dit model? Stel een vraag
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.
Product specificaties
| Merk: | Texas Instruments |
| Categorie: | Niet gecategoriseerd |
| Model: | LM5642X |
Heb je hulp nodig?
Als je hulp nodig hebt met Texas Instruments LM5642X stel dan hieronder een vraag en andere gebruikers zullen je antwoorden