Please help me understand this.
I built this circuit, exactly, with the exception of the Zener.
When I test the output of the Channel mosfet, it shows approx 2V below whatever voltage I used to trigger the gate on the N channel side.
For example, if I place 12V on the N channels gate, the P channel Drain, measured at the drain is 10.5V, and if I put 24V on the N Channel's gate I get 21.3 on the P channel's Drain.
I have searched and read and all seems to point that I should be getting approx 24V (VDD)-IlRDS at the drain.
What on earth am I not understanding here? Surely, irrespective of whether I apply 12 or 24 to the N channels gate, should I not be getting 24V-IlRds on the P channel's drain? Why am I getting 10.5 or 21.3V on the drain?