Flyback converter for DC-DC buck


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

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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