Datasheet

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2
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16
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9
1IN+
1IN−
FEEDBACK
DTC
CT
RT
GND
C1
2IN+
2IN−
REF
OUTPUT CTRL
V
CC
C2
E2
E1
D, DB, N, NS, OR PW PACKAGE
(TOP VIEW)
TL494
www.ti.com SLVS074F –JANUARY 1983–REVISED JANUARY 2014
TL494 Pulse-Width-Modulation Control Circuits
Check for Samples: TL494
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FEATURES
DESCRIPTION
The TL494 device incorporates all the functions
• Complete PWM Power-Control Circuitry
required in the construction of a pulse-width-
• Uncommitted Outputs for 200-mA Sink or
modulation (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 the power-supply
control circuitry to a specific application.
Push-Pull Operation
• Internal Circuitry Prohibits Double Pulse at
The TL494 device contains two error amplifiers, an
Either Output
on-chip adjustable oscillator, a dead-time control
(DTC) comparator, a pulse-steering control flip-flop, a
• Variable Dead Time Provides Control Over
5-V, 5%-precision regulator, and output-control
Total Range
circuits.
• Internal Regulator Provides a Stable 5-V
The error amplifiers exhibit a common-mode voltage
Reference Supply With 5% Tolerance
range from –0.3 V to V
CC
– 2 V. The dead-time
• Circuit Architecture Allows Easy
control comparator has a fixed offset that provides
Synchronization
approximately 5% dead time. The on-chip oscillator
can be bypassed by terminating RT to the reference
output and providing a sawtooth input to CT, or it can
drive the common circuits in synchronous multiple-rail
power supplies.
The uncommitted output transistors provide either
common-emitter or emitter-follower output capability.
The TL494 device provides for push-pull or single-
ended output operation, which can be selected
through the output-control function. The architecture
of this device prohibits the possibility of either output
being pulsed twice during push-pull operation.
The TL494C device is characterized for operation
from 0°C to 70°C. The TL494I device is characterized
for operation from –40°C to 85°C.
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Copyright © 1983–2014, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.