SL494

SL494 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 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 SL494N Plastic SL494D 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 SLS System Logic Semiconductor SL494 MAXIMUM RATINGS Symbol VCC VI VO Supply Voltage Amplifier Input Voltage Collector Output Voltage Collector Output Current Tstg Storage Temperature Parameter Value 41 VCC +0.3 41 250 ...