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DEVICEINFORMATION
PGOOD1
EN1
VBST1
DR
VH1
LL1
DR
VL1
24
23
22
21
20
19
PGND1
TRIP1
V5IN
V5FILT
TRIP2
PGND2
VO1
VFB1
地
TONSEL
VFB2
VO2
48
17
16
15
14
13
1
2
3
4
5
6
PGOOD2
EN2
VBST2
DR
VH2
LL2
DR
VL2
7
8
9
10
1
1
12
qfn p
ACKAGE
(t
运算 视图)
TPS51124
SLVS616A–NOVEMBER2005–REVISEDNOVEMBER2005
TERMINALFUNCTIONS
终端
i/odescription
nameno.
DRVH121
synchronoushigh-sidemosfetdriveroutputs.llnodereferencedfloatingdrivers.thegatedrive
O
voltageisdefinedbythevoltageacrossvbsttollnodeflyingcapacitor.
DRVH210
DRVL119
synchronouslow-sidemosfetdriveroutputs.pgndreferenceddrivers.thegatedrivevoltageis
O
definedbyv5involtage.
DRVL212
EN123
ichannel1andchannel2enablepins.connectto5vor3.3vtoturnonsmps
EN28
GND3ISignalgroundpin
LL120
switchnodeconnectionsforhigh-sidedriversreturn.alsoserveasinputtocurrentcomparatorsandinput
i/o
voltagemonitorforon-timecontrolcircuitry.
LL211
PGND118
groundreturnsfordrvl1anddrvl2.alsoserveasinputofcurrentcomparators.connectpgnd1,
i/o
pgnd2,andgndstronglytogetherneartheic.outputdischargecurrentflowsthroughthispin,也.
PGND213
pgood124powergoodwindowcomparatoropendrainoutputforchannel1and2.pullupwitharesistorto5v,或者
oappropriatesignalvoltage.currentcapabilityis5ma.pgoodgoeshigh0.5msaftervfbcomeswithin
PGOOD27
specifiedlimits.powerbad,ortheterminalgoeslow,iswithin10
µ
s.
tonsel4ion-timeselectionpin.看Table1.
trip117over-currenttrippointsetinput.connectresistorfromthispintogndtosetthresholdforsynchronous
ilow-sider
ds(在)
sense.voltageacrossthispinandgndiscomparedtovoltageacrosspgndandllat
TRIP214
在-currentcomparator.
vbst122supplyinputforsynchronoushigh-sidemosfetdriver(boostterminal).connectcapacitorfromthispin
itorespectivellterminals.aninternalpndiodeisconnectedbetweenv5intoeachofthesepins.用户
VBST29
canaddexternalschottkydiodeifforwarddropiscriticaltodrivethemosfet.
VFB12
ismpsvoltagefeedbackinputs.connectwithfeedbackresistordivider.
VFB25
VO11
outputconnectionstosmps.theseterminalsservetwofunctions:在-timeadjustmentandoutput
I
释放.
VO26
5-vpowersupplyinputfortheentirecontrolcircuitexceptthemosfetdrivers.connectrclow-通过
V5FILT15I
filterfromv5intov5filt.
v5in16i5-vpowersupplyinputforfetgatedrivers.internallyconnectedtovbstxbypndiodes.
5
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