Hello, I was reading the application note AN163 to design gate driver for BLDC commutation application, using gate driver such as MP6537. According to the note, the bootstrap capacitance should be higher than 8 times the mosfet total gate charge, and not exceed 1uF.
However, for my high current application, I’ve settled with mosfet with both high gate charge (218nC) and will have multiple parallel mosfets being driven per phase. Both these requirements mean the capacitor will greatly exceed the recommended 1uF value (my napkin math works out at 10.5uF total).
What do you recommend I should go about in this situation? Is the MP6537 suitable for my application, or should I select another driver? I initially selected this driver because it can drive 3-phase motor with 100V input, in a compact package, so it would be helpful if the replacement can do that as well.