The TL494 device incorporates all the functions required in the construction of a
pulse-width-modulation (PWM) control circuit on a single chip. Designed primarily for power-supply
control, this device offers the flexibility to tailor the power-supply control circuitry to a
The TL494 device contains two error amplifiers, an on-chip adjustable
oscillator, a dead-time control (DTC) comparator, a pulse-steering control flip-flop, a 5-V,
5%-precision regulator, and output-control circuits.
The error amplifiers exhibit a common-mode voltage range from –0.3 V to
VCC – 2 V. The dead-time control comparator has a fixed offset that provides
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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