Help understanding diode function in bootstrap half bridge gate driver circuit

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#1 21685946 24 Aug 2022 19:05

greghagen greghagen

Anonymous
Post #1
21685946 24 Aug 2022 19:05

I am working with a bootstrapped half bridge gate driver and I am wondering if anyone knows what function D24 is performing in the attached image? I can't find this specific diode placement in any of the other circuits that I have found online. Thanks.

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#2 21685947 26 Aug 2022 18:37

David Ashton David Ashton

Anonymous

Post #2
21685947 26 Aug 2022 18:37

You are not using the IC as a half bridge driver but as a one-sided mosfet driver (you are not using the LO or Low Side Output). You are driving a motor which is inductive and liable to generate spikes of voltage. D7 and D8 will catch negative spikes, I would guess that D24 is there to catch any positive spikes generated by the motor - it will short them to the high output derive line. Anyone got any better ideas?
#3 21685948 03 Jul 2023 09:33

Floraao Floraao

Anonymous

Post #3
21685948 03 Jul 2023 09:33

Cool.
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Help understanding diode function in bootstrap half bridge gate driver circuit

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