I am replacing a mosfet in a PWM circuit. I know the gate measured 9V to it, I know the amperage should not exceed 30A, and the Voltage will not exceed 22-25VDC. Problem is the mosfet that burned up has a proprietary number that cannot be found. I will have to take a stab.
The mosfet is a TO-220 package. I realize many would not really be rated for this much current alone and it does have a single copper heat sink. I realize that it really just comes down to temp and heat dissipation but wondering if there are any general guidelines for surface area of heat sink relative to increased amperage of mosfet and how much you can push them? ie, 3A mosfet with no sink, 30A with 10sq in copper sink...? I assume that might be pushing it a bit..
The mosfet is a TO-220 package. I realize many would not really be rated for this much current alone and it does have a single copper heat sink. I realize that it really just comes down to temp and heat dissipation but wondering if there are any general guidelines for surface area of heat sink relative to increased amperage of mosfet and how much you can push them? ie, 3A mosfet with no sink, 30A with 10sq in copper sink...? I assume that might be pushing it a bit..