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No special requirements for this diode. You can use 1N4744A for example. The main purpose is to limit the voltage on the gate of the mosfet.
Thank you. I have fixed one more issue. :)
You shouod pay attention to the maximum restoration time of the diode. For fr304 it is 0.15 microseconds. Only fast recoverable diodes have such characteristic in the datasheet.
Honestly, fr304 is too powerfull for the schematics (400 volts) you could use fr302 or fr301.
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