Update.
Parts arrived. I’m very busy these days, not clear when can I test thoroughly.
- MCU works. I replaced the STM with GD, so far working.
- 12V buck DC-DC step down works.
- 3.3V buck DC-DC step down works.
- Driver works, tested only low side, high side needs MOSFET connected to charge the bootstrap circuit. Apparently this driver cannot use the external power to charge the high side bootstrap, it needs diodes.
Will fully assemble and load test everything when I get the time, but this is extremely encouraging. Virgin design working out of the box is rare.
