gate driver transformer setup

[zilog]

Originally posted by switchmodepower
You also need protection diodes from primary of drive xfmr to the +15V rail (across top trasistor drive).

I would also but a 10k or so directly across the secondary winding- used during dead time..

Other than that it looks like one of my circuits

Is the purpose of the 10kOhm to catch the leakage inductance spike during turn-off of the mosfets?

Btw, how high should I aim with the turn-off buffer PNP? The FZT790A seems ideal, but it not very easy to get hold of over here. Unfortunately all other orderable parts I can find inside swedish borders have lousy gain aboce Ic = -0.5A. I havent done much testing to compare fall times between say FZT790A (I used them in my UcD-amp) and lesser ones such as BC640. Will the fall-time difference be significant for a switching frequency of 53kHz?

I also plan on trying to drive the transformers without the totem pole-buffer to see how much that trade-off costs in performance.