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LM5022: PMP7763 (LM5022 based) isolated DC to DC converter application question

Part Number: LM5022

Hello,

I would like to modify the PMP7763 design to yield approximately 30V @ 1.5A out and I am having a hard time specifying an isolation transformer for this design. I would like to be able to accept up to 800V input on the primary side and a 500khz switching frequency and I am wondering if there are off the shelf transformers that might be acceptable for this application that I can test to avoid having to custom wind a transformer at the outset.  What is the voltage limit on a typically OTS transformer? I would assume it is constrained by both insulation breakdown and saturation voltage.  What would be the parameters for an isolation transformer that would meet these requirements??

Thanks for any help you can provide!

-Seth