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TL494 PWM Control Circuit
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TL494 PWM Control Circuit
The TL494 device incorporates all the functions required in the construction of a pulse-width-modulation (PWM) control circuit on a single chip. Designed primarily for power-supply control, this device offers the flexibility to tailor the power-supply control circuitry to a specific application. The TL494 device 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%-precision regulator, and output-control circuits. The error amplifiers exhibit a common-mode voltage range from –0.3 V to VCC – 2 V. The dead-time control comparator has a fixed offset that provides approximately 5% dead time. The TL494 on-chip oscillator can be bypassed by terminating RT to the reference output and providing a sawtooth input to CT, or it can drive the common circuits insynchronous multiple-rail power supplies.
Features of TL494 Pulse Width Modulation (PWM)
Complete PWM Power-Control Circuitry
Uncommitted Outputs for 200-mA Sink or Source Current
Output Control Selects Single-Ended or Push-Pull Operation
Internal Circuitry Prohibits Double Pulse at Either Output
Variable Dead Time Provides Control Over total range
Internal Regulator Provides a Stable 5-V Reference Supply With 5% Tolerance
Circuit Architecture Allows Easy Synchronization
Applications of TL494 Pulse Width Modulation (PWM)
Desktop PCs
Microwave Ovens
Power Supplies: AC/DC, Isolated with PFC, >90W
Smoke Detectors
Solar Power Inverters
E-Bike
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Tags: pwm control circuit, control circuit, power supply control