Core losses coefficients

[AAOAA]

Hello,

Actually, I am working on a SMPS that is used for research purposes 10V input, 5000V output almost 0A output current, the lowest possible power dissipation is required.

My interest here is about core losses. The equation that is given in the Master datasheet (nomograms are not in the datasheet)
Pv(f,B)=f^(1+x)*B(2+y)

My question, how can I determine the core X, Y coefficients?

Epcos P18X11:
**broken link removed**

Thank you.

 

[FvM]

The core losses are specified with the general sifferit material data, e.g. N87, not the individual core data sheets. I don't have the documents that are relaunched under the TDK brand, but I presume they still have the information that was previously available. There's also the ferrite calculation tool.