I just want to control a 48 volt and 30 amp current with pwm singnal...i don't nkow what components is needed for this
simulate this circuit &ndash; Schematic created using CircuitLab
There are not many P-Channel Mosfets with high current ratings. The circuit is an example of a buck with a high side N-Channel. If you want to use an N-Channel as the high side switch, you use and isolated DC-DC and isolated gate driver. The negative output of the DC-DC regulator gets referenced to the source of the N-Channel. Then the isolated driver's output signal is 15v referenced to the source. I would also recommend using a snubber because you're going to likely see voltage spikes across your mosfet. A 10ohm resistor and 3300pF would probably be a good start. You may need to go to a 200v or 250V mosfet if the spikes are bad enough.