Hi every one. If I paralleling 3 - 50Amp mosfet with together, can to withstand current about 100-150 amp?
The answer depends on what your are doing with the MOSFETs. Can you specify your application?
If you simply want to pass 150A with fully enhanced FETs (gate 10V above source), and you never develop significant stresses (Rds across the FET), such as charging capacitors, stepping the voltage, or dramatically stepping the load current, then yes, three parallel FETs may perform adequately. You must consider DC self-heating in the form of I^2*Rds to determine if the FETs will stay cool enough during normal operation. If, however, you attempt to pass 150A while there is any significant Vds across the FETs, then they will heat up quickly, and you must consider safe operating area (SOA), which is a measure of how much self-heating the FET can tolerate in a given amount of time. Additionally, there are occasions when parallel FETs won't share the stresses evenly, and one of the three could take most of the stress, heating more quickly than its parallel partners.
If you give more details about your application I'm sure we can give more detailed advice.
Thanks Nathan. I have a zvs induction heater that is paralleling irf260n mosfes, in data sheet irf260n max current is 50 a, and in circuit 3 mosfets are paralleling. But manufacturer says that max current for the board is 50 a.
So why paralleling?!
Usually for high reliability. It is not recommended to use transistors at maximum current