Hi to all,

I am working on 24 volt BLDC 3ph drive application. I have made this design with basic understanding of p and n channel MOSFET. In this design, MOSFET gate pulse is in voltage range of 18-20 volt. I am quite confuse about choosing correct value gate resistor. I came to know that it must be within 20-50 ohm. I applied many combination but still problem lies same as previous one.

I also came to know that may be dead band is not quite enough that will make MOSFET hotter so i changed it accordingly. From 1us to 3.2us. But still no change in temperature.

please be noted that gate pulse is coming from the Allegro based BLDC driver A4963. I am also attaching sch. Of it.

Kindly give me suggestion regarding this and tell me that what precautions should be taken in this schematics.

Thanks

N channel: IRF3205 P channel: IRF4905 Driver asic A4963 Allegro