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Mosfet internal diode as free-wheelings ones...

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Faizan Jawaid

Faizan Jawaid

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mosfet internal

The Mosfets IRF540 & IRF9540 have an internal Drain to Source diodes...I have made a Full-bridge using these N-Channel and P-Channel mosfets. My switcing load is a 12V 1A DC Motor. Is it still necessary to have free-wheeling diode across each mosfet?, though they have internal ones.

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mosfet as diode

You typically don't need free-wheeling diodes, but you should use synchronous free-wheeling in a full bridge if ever possible. Standard PWM schemes are using it.
 

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