LLC vs AHB (Hybrid flyback)

AC-DC Power Converters
1

HI,

I would like to ask question about LLC vs AHB

  1. For Pout >140W/200W. Why LLC is recommended to use in common usage, rather than AHB?
    is it related to LLC with 2 output mosfets share the current stress, but AHB with 1 output mosfet only? Or other reason (eg efficiency data) ?

  2. Most LLC mass production charger is with “Extra” resonant inductor for stability inductive region ,
    but most AHB mass production/demo board charger is without “Extra” resonant inductance, just use transformer leakage inductance to do so.

Why AHB can use transformer leakage inductance as resonant inductor? But LLC can not?
=>
Why AHB can accept this relative high tolerance of leakage inductance in design, but LLC can not?

Thanks a lot

2

My 10 cents, the article mentions that hybrid flyback topology, utilizes a resonant capacitor to output extra power through the transformer and is more suitable for higher power applications compared to conventional flyback topology, and it can also experience a second SR gate and shoot-through. Therefore, possibly LLC is recommended over AHB for high power applications because of its superior control of synchronous rectifiers and lower risk of shoot-through. Also, the challenges of controlling SRs in different flyback variants, may also contribute to the preference for LLC in common usage.