Hello all. Long time reader, first time poster.
I've used MOSFETs as switches for applications before, but I'm curious as to why the data sheets don't contain a K value for the device. I hate when folks reference "back in school", but we always had the K values of a device when we were trying to work problems or solve the the length and wide etc...
My question is: Why do MOSFET data sheets only show some generic curves for different Vsd, Vsg values? If I'm using a pmos as a high side switch and want to make sure that I can draw the amount of current needed via Id, how can I be sure that the mosfet is going to be in the currect region and able to do so without being able to calculate Id because K is unknown. I have to be missing something and just wrapped around the axel since I haven't done this in a while. Thanks in advance for the help.
I've used MOSFETs as switches for applications before, but I'm curious as to why the data sheets don't contain a K value for the device. I hate when folks reference "back in school", but we always had the K values of a device when we were trying to work problems or solve the the length and wide etc...
My question is: Why do MOSFET data sheets only show some generic curves for different Vsd, Vsg values? If I'm using a pmos as a high side switch and want to make sure that I can draw the amount of current needed via Id, how can I be sure that the mosfet is going to be in the currect region and able to do so without being able to calculate Id because K is unknown. I have to be missing something and just wrapped around the axel since I haven't done this in a while. Thanks in advance for the help.