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I need suggestions for higher power MOSFETs... Answered

Hello! I'm, building a standard H-bridge motor control circuit, but I can't find the power MOSFETs I need. I have a schematic which uses IRF630 / IRF9630 MOSFETs, but they'll only handle 9 amps at 12 volts. The motor I'm controlling will require a continuous current of 25 amps at 24 volts, with a max of 45 amps (if the motor is in the locked rotor condition). I'd like them to reach "fully on/off" with +12 volts at the gate.

Does anyone have suggestions? I'd prefer built in electrostatic discharge protection, but beggars can't be choosers, so I welcome any suggestions.

Thanks to all!



3 years ago

MOSFETs in saturation will share current. If you can only get 630s, then put 4 in each leg of the bridge. Your problem will be adequate gate drive current to make sure they saturate.

Bear in mind that devices for this are now much more readily available in surface mount than through hole packages.

If I go to Digikey, type in MOSFET and select suitable continuous current, I get more than 10 pages of options.



Answer 3 years ago

Thanks for the feedback, this could be a good choice. I'll also need a P-Chan depletion type of similar ratings to complete the H-Bridge. I'll check both Mouser and Digi-Key to see what they've got. I'm 57 and I've only just gotten into electronics a few weeks ago for the first time in my life, so you can imagine it's a bit daunting for me given the rich plethora of details to consider. Thanks again for the help!