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The zener diode array on that schematic is a very lossy way to achive snubbing of the turn-off transient. I suggest tying a sunbber from the MOSFET drain to the power rail...diode (anode at the mosfet) to an R&C in parallel.
This may be far off-topic but, I had a HV circuit design once to drive a TWT (traveling wave tube). The output had to have extremely small ripple. The switching power supply could not achieve this due to the small HV cap value so, I put a small linear regulator on top (reference to rtn via a...
It's not the Spice speed. The sampling rate is your 100kHz switching frequency and so the Nyquist frequency is that same 100kHz. I came into power electronics design long ago from a control-theory background and started putting this effect into all my bode plots. On spice phase plots I always...
You need to account for the effective phase shift due to the sampling frequency. This is = to 180deg*F/100kHz. The linear analysis will not show this effect. Look at the last plot for example. Cross over is at ~30khz so there is another 54deg phase shift you need to sketch in. What seems to be...
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