Is anyone out there? This seems to be a start-up problem. It gets into some sort of a limit cycle and is unable to finish powering up. It regulates nicely for about 7ms and then shuts off, allowing the output to droop down. Then is wakes up again and the process repeats. If I power the load externally for a moment the problem disappears and it runs fine for days at a time. The load is only drawing about 25ma consistently. The current will be higher while the decoupling caps charge but this part should be able to handle that. I assume there is something I should be doing differently to get it to power up gracefully but it isn't obvious where to start looking.
Mike