I'm trying to restore some of my gate signal using an isolated gate drive. I've tested a Murata 2mH pulse transformer, part# 78601/1C,
1:1, ET 20VuS, 49pf capacitance.With a twelve volt signal and 50% duty cycle @ 100kHz my Vgs is only a little over 6V. This isn't enough to fully enhance my mosfet FQP27N25. So I looked into some DC restorer circuits and found one from IR ; AN-950.Shown here
But it's not working I cranked my primary side fet driver up to 16V and I'm still only getting +7.6Vgs and an equal -Vgs.
Theses are my actual waveforms.CH1 is the Mosfets Vgs. CH2 is the primary input after Z1 which is 0.2uf cap and 3.3oHm resistor. I'm using an irlm2803 fet for the rectifier.
Magnified few one period
Several cycles
I'm useing a mic4416 driver on the primary which can sink/source 1.5A.