Ulrich:
We reported REF required 1uF in our PCB /circuit to go to 5V.
But up to 50V, no RUN signal on pin4
Compared with Eval kit, up to 50V, Eval kit RUN is also low( kind of in hi Z state).
Eval kit RUN goes high around 100V DC input. And Pulses appear as well.
The d/s sheet indicates that RUN stays low during STARTUP.
But the Debug document lists REF &RUN to be high as exit criteria for getting PWML around 25V rms.
Should ignore that exit clause & ratchet up VBULK until we see Pulses?
-robin