SL494

System Logic

Semiconductor

SLS

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 b eing 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

ORDERING INFORMATION

SL494N Plastic

SL494D SOIC

°C to 85° C

for all packages

PIN ASSIGNMENT

FUNCTION TABLE

Output Control

Output Function

Grounded

Single-ended or Parallel Output

Normal Push-Pull Operation

LOGIC DIAGRAM