LT3758 in Flyback with optoisolator feedback for 24V and 4A

Hi Dear,

      I want to use LT3758 in Flyback with optoisolator feedback for 24V and 4A output with 18V to 36V input.

I am not a power engineer, can you please provide some suggestions regarding the transformer selection?

I have to select a switching frequency of 530KHz.

Kind regards

Mohsin