While selecting a MOSFET for application how do we calculate the peak currents which can occur in the circuit? I am designing a DC/DC interleaved synchronous Buck Converter (2 MOSFETS per rail) for 2KW and for selecting the MOSFET I am calculating the Power losses in few MOSFETS to get a comparison between different MOSFETs. So fro my application per interleaved rail will carry 41.67A RMS output current. How do I decide the continuous drain current required for my application according to peak currents which can appear in the circuit? What can cause these peak currents in the circuit? Is it a good enough assumption to have a margin of 100% or more? The device will be operating in continuous conduction mode and the ripple is very low due to high value of inductance chosen and interleaving of the rails.