I have an IRF1404 in a circuit that is getting much warmer than it should in theory. The MOSFET is rated at 0.004 ohms Rds when on. With the gate driven at 5v, which is over the 4v max in the spec sheet, the MOSFET still gets very even with a small heatsink attached.
Only about 3A @ 36V is going through it with a 100% duty cycle. So it's basically just on.
watts = current^2 * resistance
So it should be dissipating 0.036w, but it seems like much more, closer to 5w.
Only about 3A @ 36V is going through it with a 100% duty cycle. So it's basically just on.
watts = current^2 * resistance
So it should be dissipating 0.036w, but it seems like much more, closer to 5w.