On Wednesday 12 April 2006 18:10, I.F. wrote:
First the good news - after hours of searching I found the document, its a
Shindengen MJ2400. Now for the bad news! - The chip is based on a modified
bridge rectifier with integral thyristor to shunt the inrush limit resistor
after start up. Sorry I made a mistake, this chip is only suitable for SMPSU
circuits that have a mains bridge rectifier and smoothing cap input - it
won't work with a transformer.

Hours of searching? You sure are willing to invest time in helping people. You
have my thanks, even though I can't use the chip.

Anyway, Instead, I'm gonna make a time delayed relay driver, which bypasses a
block of resistors (which are in series with the primary coil) a short time
after power up. I'll put a thermal fuse on the resistors to make sure it
disconnects should the transformer develop a short. A normal fuse, slow blow,
in series with the resistors, rated at lower value than what the resistors
would use without the transformer in series with them might also be a good
idea. If I time it right, I should be able to use a fast blow fuse as main
fuse then (as noted by the PDF Ross Herbert pointed to). Experimention is in
order.