I have done a design based on the Innoswitch3, INN3676C.
Primary side does strat up. BPP is 5.73V. There is one switch cycle on the primary side. Which looks OK, rather short ~200ns.
After some time, 2-3s, a new start attempt
Shouldn't there be a burst of switching cycle until the secondary starts up and take control
Datasheet mentions a time Tar in which the secondary side must start up. Typically 82 ms.
What could cause the controller to inhibit startup after only 1 switching cycle ?