Gate resistor on mosfet IRFP450

[sendms]

hi everyone!
First, sorry on my bad english....
How to limit drain-source current to 6A ( irfp450 max curent is 16A) by gate resistor?
My gate-source voltage is about 6 volts.
I need that beacose i have plasma cutter with 2sk2873 mosfet-s(that burned),and i want to swap that fet-s with irfp450.Is it possible?
Gate resistor on that 2sk2873 currently is 6,8 ohm!
Thanks for help!

 

[vfone]

Just changing the gate resistor doesn't help too much. You have to reduce the Vgs to about 6V.

 

[sendms]

ok, what is the best way to do that?

 

[vfone]

The best way depends by your circuit, but you can try a resistive divider.

 

[FvM]

I guess you're talking about a switched mode supply? In this case, there's no chance to limit the transistor current by changing a gate resistor or reducing a gate voltage. You have to understand the circuit operation and modify the PWM timing or resdesign the circuit.

 

[sendms]

yes, it is a swiched mode supply...i can't understand circuite beacose i do not have schematic...