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Pulse-Width-Modulation Control Circuits

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FEATURES
- Complete PWM Power Control Circuitry
- Uncommitted Outputs for 200 Ma Sink or Source Current
- Output Control Selects Single-Ended or Push-Pull Operation
- Internal Circuitry Prohibits Double Pulse at Either Output
- Variable Dead-Time Provides Control over Total Range
- Internal Regulator Provides a Stable 5-V Reference Supply,5%
- Circuit Architecture Allows Easy Synchronization
- Moisture Sensitivity Level 3
DESCRIPTION
The TL494 incorporate on a single monolithic chip all the functions required in the construction of a pulse-width-modulation control,

TL494

SOP16

DIP16
these devices offer the systems engineer the flexibility to tailor the power supply control circuitry to his application.
The TL494 contains an error amplifier, an on-chip adjustable oscillator, a dead-time control comparator, pulse-steering control flip-flop, a 5-volt, 5% precision regulator, and output-control circuit.
The error amplifier exhibits a common-mode voltage range from -0.3 volts to Vcc -2 volts. The dead-time control comparator has a fixed offset that provides approximately 5% dead time when externally altered. The on-chip oscillator may be bypassed by terminating R T (pin 6) to the reference output and providing a sawtooth in put to CT (pin 5), or it may be used to drive the common circuits in synchronous multiple-rail power supplies. The uncommited output transistors provide either common-emitter or emitter-follower output capability. Each Device provides for push-pull or single-ended output operation, which may be selected through the output-control funct -ion. The architecture of these devices prohibits the possibility of either output being pulsed twice during push -pull operation.

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