IL494

TECHNICAL DATA IL494 PWM Control Circuit The IL494 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 IL494 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 outputcontrol 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 ORDERING INFORMATION IL494N Plastic IL494D SOIC TA = -20°C to 85° C for all packages PIN ASSIGNMENT FUNCTION TABLE Output Control Grounded At Vref Output Function Single-ended or Parallel Output Normal Push-Pull Operation LOGIC DIAGRAM 1 IL494 MAXIMUM RATINGS Symbol VCC VI VO Tstg Supply Voltage Amplifier Input Voltage Collector Output Voltage Collector Output Current Storage Temperature Parameter Value 41 VCC +0.3 41 250 -65 to +150 Uni...