check the value of R7. if it's really 500M, then it takes almost all of the 24V voltage (simple voltage divider formula, 500M against 2.7M) and so your mosfet is not so correctly polarized (in this case, always ON - maybe the inductors are supposed to oscillate the gate voltage a bit, but what good does it do since it's way too high at around 23.9...V).

(i'm also a digital guy, so please don't ask me about inductors, haha...)

anyway, looking at the load side of your mosfet: anytime it's ON, all the 24V goes through its own internal resistance since you don't place any resistor in series with it. look at it - it's basically a freaking short circuit anytime your mosfet is ON... logically, isn't R6 (the load, right?) supposed to be placed there?

This post has been edited by arturo_bandini: Jun 29 2012, 09:24 AM