Drain current equation for mosfet

[bspandaaa]

How to frame the drain current equation
simply from the drain characteristics and
transfer characteristics graph?
Thank you.

 

[Audioguru]

The graphs on a datasheet are only for a "typical" device. Some devices are minimum and others are maximum. Adding negative feedback reduces the differences between them.

 

[D.A.(Tony)Stewart]

There will be a tolerance on Vgs threshold and RdsOn for which the min max are given in tables and the VI curve is for typical at 25'C only.

 

[bspandaaa]

use mathematics