As far as I understand the flyback topology, it can be used in both buck and boost converters.

What I am not sure about is: Does it also work for the case where buck-boost is needed, i.e. V<sub>in,min</sub> <= V<sub>out</sub> <= V<sub>in,max</sub>?

I think it should, but googling the topic immediately leads to the [SEPIC converter][1]. Also, I know that isolated SEPIC is possible, but I rarely see design examples.

Could you give me some idea on what topology to use for the specific case of:

9 < v<sub>in</sub> < 24 V for v<sub>out</sub> = 12 V at 1 A, galvanically isolated

  [1]: https://en.wikipedia.org/wiki/Single-ended_primary-inductor_converter