Wrong. During the switching period the inductor voltage must be equal to the input voltage for the transistor to be fully on (think of the transistor as simulating a zero-ohm switch). Thus Vg must be 10V more than the input voltage (which is also the transistor output source voltage when the transistor is fully turned on).So meaning it doesnt matter what type of configuration that my NMOS is in (Source grounded or Source follower config). All i need to see is Vgs ya? For example the output of buck converter needed is 6V, so meaning that wil be my Vs? and from there if Vg is somewhere around 14V~18V it can drive my nmos to on properly? because Vgs more than or equal to around 10V?
to off it on the other hand my Vgs needs to be 0 right? meaning, Vg can be 6V or less right?
To turn off, Vgs should be below the minimum threshold voltage for the transistor, not 6V, since in a switching buck regulator, the MOSFET switch output voltage goes to ground (or slightly below) due to inductor current flowing through the flyback diode to ground during the transistor off period.
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