TL494 Pulse-Width-Modulation Control Circuit
Description
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 specific application.
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
Features
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Complete PWM Power-Control Circuitry
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Uncommitted Outputs for 200mA Sink or Source Current
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Output Control Selects Single Ended or Push Pull Operation
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Internal Circuitry Prohibits Double Pulse at Either Output
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Variable Dead Time Provides Control Over Total Range
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Internal Regulator Provides a Stable 5-V Reference Supply With 5% Tolerance
-
Circuit Architecture Allows Easy Synchronization
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