This is a linkswitch CV design that I have referenced in this post previously: https://ac-dc.power.com/forum/low-power-design/2019/lnk625dg-dual-output-12vdc-04a-33vdc-04a-output-regulation-33v
I previously was running it at 120VAC for initial testing. I recently tried 240VAC and found that it is not working. The output "Flashes" on and off when the DC bus is above 250VDC. Can you tell me what causes this and how to resolve it? I have attached oscilliscope captures to give a better idea of what it looks like. It does not matter what the load is, the operation is basically the same.