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2022-09-24 23:33:15
AN-TL494-Pulse width modulation control circuit
The TL494 integrates all functional circuits required to build a pulse width modulation (PWM) control on one chip. Primarily used for power control, this device provides flexibility to customize the power control circuit to a specific application. The TL494 contains two error amplifiers, an on-chip adjustable oscillator, a dead-time control (DTC) comparator, a pulse steering control flip-flop, a 5 V, 5% regulation accuracy, and an output control circuit. The error amplifier exhibits a common-mode voltage range from 0.3 V to VCC - the 2 V dead-time control comparator has a fixed offset, providing approximately 5% dead-time. An on-chip oscillator can bypass the terminating RT reference output and provide a sawtooth input to the CT, or it can drive circuits that share multiple rail supplies in synchronization. Uncommitted output transistor common emitter or emitter follower output capability. "The TL494 is for push-pull or single-ended output operation, and the function can be selected by the output control. The structure of the device prohibits the possibility of double-pulse or output push-pull operation. The TL494C is a characteristic TL494I that operates from 0°C to 70°C Characterized for operation from -40°C to 85°C.