Easy Power MOSFET Substitution?

[Electric_EyE]

Hi guys, I need some help with MOSFET design. I am modifying a PWM motor driver circuit. The original circuit has an N-channel mosfet IRFZ48N, good for about 50 amps. I need more like 200 amps. Can I substitute in another N-channel MOSFET? I am looking at an STE250NS10, which is good for 200+ amps. Here is the schematic... TIA

 

[mneary]

You didn't mention your switching frequency.

If your frequency is high, you're going to have to redesign your gate drive circuit so it can handle 31nF instead of the IRFZ48N's 1.9nF. With your 12 ohm pullup resistor it might be awfully slow.

Also beware that although the transistor might handle 220A, a ring terminal held by an M4 screw is another story.

 

[Electric_EyE]

I'm anticipating upper frequency of 10kHz. But it might be closer to 1kHz most of the time. I'm going to be experimenting with that. Thanks for you help. Is there an easy way to get around the pull-up resistor?