So, today was the attack on the fet driver. Last night I paged thru a lot of datasheets before finding a circuit that I thought would work out properly for the project. Interestingly enough, it basically just offsets the drive signal of a low side fet driver, which is exactly the type of solution I was interested in.

With 2 possable varriations, I have working circuits.

I was playing with the gate driver for the power fet, I have two circuits available, one is a bipolar totem pole driver, and the other is a fet totem pole driver. the photo below is the bipolar, but the only way I was able to get the performance I wanted was to bump the drive supply up to 12V from 5V (need 10V anyhow) and to put an inductive load on the power fet that would respond faster to the switching. I want to go back and try the fet drive.

At the end of the day, the circuits on time is 0.25us, which might sound good till you realize that at 250Khz, the on time is only 4us. I can lower the switching freq if I need to, 250Khz was a bit of an insane goal. (but I'm doing awefull well)

my alternate power fet driver is...

So, now I have a regulator, pwm genorator, and fet driver, the only other part is to make a buck filter and put it all togethor. (it wont be as easy as it sounds)

And the old bench supply burned out AGAIN, I dont know what did it this time, last time I had to replace the LM723 controller in it.