PWM Control Circuit

The  SL 494 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

·  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