Buck-Boost converter with 20-253V ac/dc

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Dear All,

I'd have to design a buck-boost converter with the following specs:-

1- input voltage 20-253 Vdc / 20-253Vac
2- Output voltage 12 Vdc
3- Output current 250-300 mA

what is the suitable controller to use for this application?

I found a design example for such a converter for a lower output power (12V/50mA) using a TNY268.
Is it possible to realize my specs with this older component.
Are newer components available, that can run from 20Vac/dc and below up to 253Vac/cd.

Best regards
Christian