Aditya,
Your specifications suggest a straight forward flyback converter design, 2:1 input voltage range, probably operating in DCM over the entire line/load range. Here is a TI/Unitrode application note that will walk you through the design calculations…
Part Number: LM5021 Other Parts Discussed in Thread: PMP20278 Hi
I has used the LM5021 to design a 10W DC / DC module, but the PWM frequency unstable.
Do you need to pay attention to the place（PCB Layout)?
no loading ripple over spec, has any solution? …
