> To read, probably, this good doc

Jim Williams did it. It will be good.

> cds.linear.com/docs/Application%20Note/an118fa.pdf

Fig 17 may be of much interest.
A 555 or similar could be used as the driver.
the main trick here is the "cascode" drive of the high voltage MOSFET
with a low voltage switch.
The FET gate is held at no more than +15V by the 15V gate to ground
zener diode and the source is switched. The switch carries the full
output current but only "sees" 15V maximum.

This could be used directly for a 1000 V supply with suitable
component changes.
Like most such circuits it MIGHT kill you easily if you let it.
(I've had many HV shocks (none recently) and survived - others have
been less lucky).

  Russell

> "Figure 11. Controlled Transition Time Switching Regulator Applied to
> a Negative Output,
> 1000V Converter. A1 Provides Low Impedance, Inverting Feedback to LT1534"
--=20
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.