Audioguru and d123,
While the NMOS is enabled, Vg of the PMOS is connected to ground so Vg=0. I thought that would turn off the PMOS? I am having to actually connect a positive source to the gate, no less than 12V in this case, for it to turn off. Is there another way for me to switch the PMOS using a low voltage? Eventually, I'm going to have ~500V on the input. It is not possible for me to apply a 500V signal to switch the FET.
d123,
Thanks for pointing out the resistor value. It makes sense why it was in the mA regime. So I guess the real problem is its just not turning off when the gate is connected to ground. I was originally using a generic LTspice PMOS but picked one from the bucket of models just to see if it worked using one. it didnt.
This is a buck converter. And I was using a 5V source to switch the NMOS because it's just a generic LTspice model and works for it.