The fatal bug is that the overcurrent fault falls within the error amp's normal unsaturated range (2.2V or something).
So it can't start up, as near as I can tell, ever. It just sits there trying to command full current, then chatters, resetting the soft start pin and waiting before doing it again.
I had an application with 500mA 12V output; I got ~200mA startup current by removing the SS capacitor altogether. This makes it repeat at a few hundred us, which was enough to start up my application, but obviously not preferred.
My thread on e2e, clearly not too happy discovering this:
https://e2e.ti.com/support/power-management/f/196/t/751106 Seemingly, they know it's a lemon and don't even support it!
Yes, LM5022 should be reasonable. I haven't used it. Block diagram seems alright.
Tim