We need to make a carrier board for the 100V 20A (1/3 duty cycle) GaN FET.
http://173.224.223.62/motor/epc1.jpg
We can plate it with heavy copper (5 oz +) and/or add solder to the traces. However, the closet distance between 100V is only 8 mils. Would that be a problem with FR-4? Are there better material for isolation?