Parallel connection of multiple half-bridge for high current motor applications

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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/public/data-sheets/Si823x.pdf
https://www.diodes.com/assets/Datasheets/ZXGD3005E6.pdf
https://www.mouser.com/ProductDetai...BnLwtzucur3zoAtudlOjl2KkrycvUZGQmh301CeeOM%2B
 

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.
 

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-detail/en/silicon-labs/SI8231BB-D-IS1R/336-4350-2-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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