Texas Instruments LM5642X Bedienungsanleitung
Seiten 44 Nicht kategorisiert
Lies die Bedienungsanleitung für Texas Instruments LM5642X kostenlos online oder lade das PDF herunter. Diese Anleitung wurde 15 Mal aufgerufen. Frage zu diesem Modell? Stelle eine Frage
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.
Produktspezifikationen
| Marke: | Texas Instruments |
| Kategorie: | Nicht kategorisiert |
| Modell: | LM5642X |
Brauchst du Hilfe?
Wenn Sie Hilfe mit Texas Instruments LM5642X benötigen, stellen Sie unten eine Frage und andere Benutzer werden Ihnen antworten