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Dual-output PWM controller

TL494 Working Principle

Learn how TL494 works with an illustrated explanation and practical readings.

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TL494 at a glance

Follow the labeled connections and functional stages

TL494 working principle: illustrated functional stages, basic circuit and connections
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How it works

3 stages · Explore one step at a time

Step 1 / 3

Generate a timing ramp

RT6 and CT5 establish the sawtooth period. The first-order design equation is fOSC ≈ 1/(RT × CT).

Step 2 / 3

Limit pulse duration

The PWM and dead-time comparators suppress conduction when their control voltage exceeds the active timing ramp.

Step 3 / 3

Steer the outputs

Pin 13 chooses simultaneous pulses or alternating channels. Each C/E pair needs a suitable external connection and load.

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