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Extra schottky diode in H bridge circuit

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farhang_760

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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
 

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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