20 Oct 2003, 12:10, Roy J. Tellason (1:270/615), wrote to JIM HOLSONBACK:

Hi Roy.

 JH>> sometimes caused the testbed ATX PS to shut itself down,  but the 
 JH>> PS generally started working again after a few minutes cooling 
 JH>> down period.  The testbed has a good-quality PS - Astec as bir.  
 JH>> Maybe a less expensive PS would have blown a fuse?

 RJT> Beats me,  I know a little bit about how switchers are designed, 
 RJT>  but not the part about how they can shut themselves down and 
 RJT> come back later...  Maybe I can find some more info on it...

On the output side there is a crowbar SCR that shuts down the output on
overload, then feeds that 'ground' to an optocoupler that shuts down the
primary side through an RC 'timer' to the base of the main switching
transistor.


     Good luck...  M.

--- Msged/386 TE 06 (pre)