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特性
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
1IN+
1IN−
反馈
DTC
CT
RT
地
C1
2IN+
2IN−
REF
输出 ctrl
V
CC
C2
E2
E1
d,db, n, ns, 或者 pw pACKAGE
(t运算 视图)
描述
TL494
脉冲波-宽度-modulationcontrolcircuits
SLVS074E–JANUARY1983–REVISEDFEBRUARY2005
•
completepwmpower-controlcircuitry
•
uncommittedoutputsfor200-masinkor
SourceCurrent
•
outputcontrolselectssingle-endedor
推-pulloperation
•
InternalCircuitryProhibitsDoublePulseat
EitherOutput
•
VariableDeadTimeProvidesControlOver
TotalRange
•
internalregulatorprovidesastable5-v
ReferenceSupplyWith5%Tolerance
•
CircuitArchitectureAllowsEasy
同步
thetl494incorporatesallthefunctionsrequiredintheconstructionofapulse-宽度-调制(pwm)控制
circuitonasinglechip.designedprimarilyforpower-supplycontrol,thisdeviceofferstheflexibilitytotailorthe
电源-supplycontrolcircuitrytoaspecificapplication.
thetl494containstwoerroramplifiers,anon-chipadjustableoscillator,adead-timecontrol(dtc)比较器,
apulse-steeringcontrolflip-flop,a5-v,5%-precisionregulator,andoutput-controlcircuits.
theerroramplifiersexhibitacommon-modevoltagerangefrom–0.3vtov
CC
–2v.thedead-timecontrol
comparatorhasafixedoffsetthatprovidesapproximately5%deadtime.theon-chiposcillatorcanbebypassed
byterminatingrttothereferenceoutputandprovidingasawtoothinputtoct,oritcandrivethecommon
circuitsinsynchronousmultiple-railpowersupplies.
theuncommittedoutputtransistorsprovideeithercommon-emitteroremitter-followeroutputcapability.这
tl494providesforpush-pullorsingle-endedoutputoperation,whichcanbeselectedthroughtheoutput-控制
函数.thearchitectureofthisdeviceprohibitsthepossibilityofeitheroutputbeingpulsedtwiceduring
推-pulloperation.
TheTL494Cischaracterizedforoperationfrom0
°
Cto70
°
c.thetl494iischaracterizedforoperationfrom
–40
°
Cto85
°
c.
AVAILABLEOPTIONS
PACKAGEDDEVICES
(1)
SHRINKSMALLTHINSHRINK
T
一个
SMALLOUTLINEPLASTICDIPSMALLOUTLINE
OUTLINESMALLOUTLINE
(d)(n)(ns)
(db)(pw)
0
°
Cto70
°
CTL494CDTL494CNTL494CNSTL494CDBTL494CPW
–40
°
Cto85
°
CTL494IDTL494IN———
(1)thed,db,ns,andpwpackagesareavailabletapedandreeled.addthesuffixrtodevicetype(e.g.,tl494cdr).
pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsoftexas
instrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.
productiondatainformationiscurrentasofpublicationdate.
copyright©1983–2005,texasinstrumentsincorporated
ProductsconformtospecificationsperthetermsoftheTexas
instrumentsstandardwarranty.productionprocessingdoesnot
necessarilyincludetestingofallparameters.
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