How to simulate an irl mosfet

It's good that you are considering the mosfet settings, because a lot of users don't...which can give poor realistic results. These EC mosfets however do not have settings for their capcitance or for direct adjustment of Rds etc. You need a program like Spice for that. Their Length and Width settings are also not directly related to real mosfets as far as their readings are concerned, and that aspect can throw a lot of users who try to adjust those readings in a futile effort to simulate real factory made widths and lengths. The thing you CAN do with the EC mosfets is to set the Vgs threshold (VTO setting) and so make it switch on/off appropriately.....That setting is all we need to do in most cases here on EC if we are just looking for simple voltage switching. If on the other hand you wish to simulate an Rds, then you can do so by altering either the Length or width to obtain your required Rds amount (just don't get side-tracked by the W and L actual readings). A real mosfet lets a large flood of current through the ds path as soon as the Vgs threshold is reached....and nearly all of that flood happens within just one volt increase beyond the threshold... that is the 'Transconductance' and it can be simulated on EC by turning the KP fully clockwise for Nmos or fully anti-clockwise for Pmos. Other alterations of that are possible, but they are mainly for simulating linear mode mosfet usage for amplifiers etc. So, to conclude....turn the W fully clockwise, turn the L fully anti-clockwise, turn the KP fully clockwise if Nmos or fully anti-clockwise if Pmos, and set the VTO to about 3v for normal Nmos or 1v for LL Nmos, and connect the Nmos Source directly to zero supply whenever possible. When you have done that....ensure that your Vgs always swings between any volts less than your VTO and more than 4.5 volts ....for your Nmos to act as a switch (or set VTO as 1v and ensure Vgs = 3.3v if simulating raspberry pi). If you need to connect the Nmos Source to anything other than the zero supply (eg to a resistor), then further important aspects need to be considered, and that also applies to cmos configurations. See....  http://everycircuit.com/circuit/5214638451195904

Thanks a lot, i normally find EC too offset to the reality, it's a main reason of why i normally use this for principles of operation and not for efficient circuits