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Hello, Thank you for your advice. Please clarify why not Push pull and why not LM2524/3524 in place of LM5030 ? I need to understand pro and cons of all possibility for the final decision.
For the post filter which filter more preferable ? Generally Flyback produce noise at input.
If you need compact size, then the flyback is the choice. Push-pull needs two switches and more transformer windings. You can use it - that is your choice. But I would use flyback for its simplicity. Your input voltage min 9V, LM5030 min Vin = 14V so cannot cover all your input voltage range.
Sepic is more complicated than the flyback.