Dear support team:
Thanks to the kindly help of Howard Chen now I can simulate with Webench. I have placed the components with the values suggested by Howard. But I still have the same problem. The regulator stops regulating at 40 V.
The signal at HO looks like the figure below. Maybe this signal gives information about of the problem.
Another problem that I detected is that although I connected pin DEMB directly to the GND in Rs, the LO pin is commutating, while LO is supposed to be always at 0 V.
When I connect the snubber, the output has oscillations at some input levels, for example when Vin = 27 V, Vout oscillates between 4 and 6 V.
Fig. 1. Signal at HO. Vin=30 V. No snubber. DEMB at 0V (but LO was oscillating).
I will appreciate your feedback.
Zeus.