High Voltage, MCU controled 300Volt power supply

[pedja089]

You are right, I just put low percent from top of my head. Anyway is still sub 1uS.
Just came to my mind, If you have linear output stage, lowest SMPS voltage could be much higher, eg 40V. In that case you will have only 16W of dissipation in linear stage(in worst case).
40-300V is much easier design.
For linear output stage Ill suggest you this design:
https://www.eevblog.com/forum/chat/d...-supply-build/
If you carefully read schematic you will notice that all circuit is floating around output voltage.

Also this might help:
Electrophoresis Power Supply Teardown