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  1. #21
    Advanced Member level 2
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    Re: Parallel connection of multiple half-bridge for high current motor applications

    Simple is always good.

    I'd look at having a fully isolated solution. Get a small isolated DC-DC (1-5W) plus a modern signal isolator and drive 8 gate drivers with that.

    Specifically I'd look at using 2 isolated supplies (NXJ2S1212MC, though 2W may not be enough), one for high side and one for low side plus an SiLabs isolated half bridge driver (Si823X). Then re-buffer the output of the SiLabs with 8 of these (ZXGD3005E6).

    https://www.silabs.com/documents/pub...ets/Si823x.pdf
    https://www.diodes.com/assets/Datasheets/ZXGD3005E6.pdf
    https://www.mouser.com/ProductDetail...h301CeeOM%252B



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  2. #22
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    Re: Parallel connection of multiple half-bridge for high current motor applications

    If I want to use an isolated DC/DC converter then I need to use an isolated gate driver and the total product price will be increased.



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  3. #23
    Advanced Member level 2
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    Re: Parallel connection of multiple half-bridge for high current motor applications

    Of course you could use an isolated DC-DC to replace a high side bootstrap scheme regardless of whether it's a fully isolated application or not.

    Also I suggest really pricing this out. The fully isolated SiLabs drivers are cost and performance competitive (often better) with non-isolated half bridge drivers. I've used them in both isolated and non-isolated applications for this reason.
    https://www.digikey.com/product-deta...0-2-ND/7201496

    And note that I'm suggesting a single isolator, followed by cheap individual followers for each fet, not multiple isolators. The isolated DC-DC's at ~$5 are not too bad either. Isolation is always beneficial and so is having identical high-side and low-side gate drive solutions.



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