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  1. #1
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    Extra schottky diode in H bridge circuit

    Hi ,

    1) I use IRF640 in H-Bridge circuit , this mosfet has one catch diode , should I place extra diode ?

    like this or this one .

    2 ) Does it help to decrease temperature or to current depletion in decay modes ?

    thanks a lot

    •   Alt5th July 2016, 10:17

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  2. #2
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    Re: Extra schottky diode in H bridge circuit

    Hi,

    there is no dedicated "catch" diode. I think you mean the body diode. The diodes are a side effect when producing MOSFETs.
    But they are slow (high reverse recovery time). So for fast switching with low dead time I recommend to use external diodes.

    For slow switching there is no need for external diodes.

    For a more detailed answer we need more details of your circuit.

    Klaus



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