Add a comment

The
TL494
device
incorporates
all
the
functions
•
Complete
PWM
Power-Control
Circuitry
required
in
the
construction
of
a

Uncommitted
Outputs
for
200-mA
Sink
PWM
control
circuit
on
a
single
chip.
Source
Current
Designed
primarily
for
power-supply
control,
this
•
Output
Control
Selects
Single-Ended
or
device
offers
the
flexibility
to
tailor
thepower-supplycontrolcircuitrytoaspecificapplication.Push-PullOperation•InternalCircuitryProhibitsDoublePulseatTheTL494devicecontainstwoerroramplifiers,anEitherOutputon-chipadjustableoscillator,adead-timecontrol(DTC)comparator,apulse-steeringcontrolflip-flop,a•VariableDeadTimeProvidesControlOver5-V,5%-precisionregulator,andoutput-controlTotalRangecircuits.•InternalRegulatorProvidesaStable5-VTheerroramplifiersexhibitacommon-modevoltageReferenceSupplyWith5%Tolerancerangefrom–0.3VtoVCC–2V.Thedead-time•CircuitArchitectureAllowsEasycontrolcomparatorhasafixedoffsetthatprovidesSynchronizationapproximately5%deadtime.Theon-chiposcillatorcanbebypassedbyterminatingRTtothereferenceoutputandprovidingasawtoothinputtoCT,oritcandrivethecommoncircuitsinsynchronousmultiple-railpowersupplies.Theuncommittedoutputtransistorsprovideeithercommon-emitteroremitter-followeroutputcapability.TheTL494deviceprovidesforpush-pullorsingle-endedoutputoperation,whichcanbeselectedthroughtheoutput-controlfunction.Thearchitectureofthisdeviceprohibitsthepossibilityofeitheroutputbeingpulsedtwiceduringpush-pulloperation.TheTL494Cdeviceischaracterizedforoperationfrom0°Cto70°C.TheTL494Ideviceischaracterizedforoperationfrom–40°Cto85°C