การใช้งาน TL494

PULSE-WIDTH-MODULATION CONTROL CIRCUITS DESCRIPTION

The TL494 incorporates on a single monolithic chip all the functions required in the construc-
tion of a pulse-width-modulation control circuit.Designed primarily for power supply control,
the TL494 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 architec-ture of the TL494 prohibits the possibility of either output being pulsed twice during push-pull operation.

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