/diy/ - Do It Yourself

>>1407975
yes. but to be sure you're not thinking of it wrong, it's not really a spike as in a brief very large amount of current. it's just that the same current that ran through the transistor now runs through the diode. so a diode rated for a pulse current equal to the continuous current in your fet is fine.

1) fet is on
2) fet turns off (<1 microsecond), meanwhile voltage increases on drain until it reaches ~36.7v sending the current through the diode
3) current in the diode decreases linearly until the motor is out of stored energy