PD3.1 adpater topology

[powerguy]

Dear experts,

I am looking for a solution for PD3.1 adpater. below are my questions.

which topology is suitable for PD3.1 adapter, ACF or AHB Flyback? could you please explain why?

1. why the power below 65W, the topology is usually use ACF rather than AHB Flyback? AHB Flyback has a less voltage strss than ACF
2. Does ST have AHB solution for PD3.1? if you have, could you please suggest me your product?
3. What's advantage and disadvantage between ACF, RQ flyback and AHB flyback
4. Any design guide of AHB flyback could provide to me?