PWM Control Circuit

The SL494 incorporates on a single monolithic chip all the functions required in the construction of a pulse-width-modulation control circuit. Designed primarily for power supply control, the SL494 contains an on-chip 5-volt regulator, two error amplifiers, adjustable oscillator, dead-time control comparator, pulse-steering flip-flop, and output-control circuitry. The uncommitted output transistors provide either common-emitter or emitter-follower output capability. Push-pull or single-ended output operation may be selected through the output control function. The architecture of the IL494 prohibits the possibility of either output being pulsed twice during push-pull operation.

 • Complete PWM Power Control Circuitry
 • Uncommitted Outputs for 200 mA Sink or Source
 • Output Control Selects Single-Ended or Push-Pull Operation
 • Internal Circuitry Prohibits Double Pulse at Either Output
 • Internal Regulator Provides a Stable 5 V Reference Supply
 • Variable Dead-Time Provides Control Over Total Range