OK, i think i got a solution.when i attach small capacitors (1nF) to FB and LIM pins, the controler works fine up to 700 VDC.i think my problem is, that i had a GND plane on the bottom and the routing of the floating switched nets was not short enoug...
I have a similar problem with a viper16 buck topologie. My test board works fine with 150 VDC, but at 200 VDC continously resets every second. For the 50 ms the regulation is fine.@PLi P.1 Do you have found a soloution for your problem?
