Flyback converter for DC-DC buck

Hello!

I am developing a DC-DC sutable toloplogy with 250 to 650 VDC input voltage, 24V/5A and 5V/3A, 12V/2A at the output.

is better resonant, quasi resonant...? i have seen this one

https://www.infineon.com/dgdl/Infineon-Design_guide_CoolSET_QR_ICE2QRxx65-80x-AN-v01_01-EN.pdf?fileId=db3a30432ee77f32012eeb24b0a33941

Can you suggest anything within this power range? I am looking for a customized design where good power solution can be applicable....

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