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AGND
VSENSE
竞赛
状态
激励
PH
PH
PH
PH
PH
RT
ENA
REFIN
VBIAS
VIN
VIN
VIN
PGND
PGND
PGND
TPS54372
SLVS430D–JUNE2002–REVISEDFEBRUARY2005
HTTSOPPowerPAD
(topview)
TerminalFunctions
TERMINALDESCRIPTION
nameno.
agnd1analogground.returnforcompensationnetwork/outputdivider,慢-startcapacitor,vbiascapacitor,andrt
电阻.connectpowerpadconnectiontoagnd.
boot5bootstrapoutput.0.022-µfto0.1-µflow-esrcapacitorconnectedfromboottophgeneratesfloatingdriveforthe
高-sidefetdriver.
comp3erroramplifieroutput.connectfrequencycompensationnetworkfromcomptovsense
ena19enableinput.logichighenablesoscillator,pwmcontrolandmosfetdrivercircuits.logiclowdisablesoperation
andplacesdeviceinalowquiescentcurrentstate.
pgnd11-13powerground.highcurrentreturnforthelow-sidedriverandpowermosfet.connectpgndwithlargecopper
areastotheinputandoutputsupplyreturns,andnegativeterminalsoftheinputandoutputcapacitors.asingle-要点
connectiontoagndisrecommended.
ph6-10phaseinput/输出.junctionoftheinternalhigh-sideandlow-sidepowermosfets,andoutputinductor.
rt20frequencysettingresistorinput.connectaresistorfromrttoagndtosettheswitchingfrequency,f
s
.
refin18externalreferenceinput.highimpedanceinputtoslow-startanderroramplifiercircuits.
status4open-drainoutput.assertedlowwhenvin<uvlo,vbiasandinternalreferencearenotsettledortheinternal
shutdownsignalisactive.otherwisestatusishigh.
vbias17internalbiasregulatoroutput.suppliesregulatedvoltagetointernalcircuitry.bypassvbiaspintoagndpinwitha
highquality,低-esr0.1-µfto1.0-µfceramiccapacitor.
V
在
14-16inputsupplyforthepowermosfetswitchesandinternalbiasregulator.bypassvinpinstopgndpinscloseto
devicepackagewithahigh-质量,低-esr10-µfceramiccapacitor.
vsense2erroramplifierinvertinginput.connecttooutputvoltagecompensationnetwork/outputdivider.
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