Which ferrite for which frequency in SMPS?

[treez]

The ferroxcube Soft ferrites databook does not state which ferrites are best for use at which frequency..

Ferroxcube soft ferrites databook:
https://www.ferroxcube.com/FerroxcubeCorporateReception/datasheet/FXC_HB2013.pdf


I am making a Boost PFC inductor for 70KHz operation using a PQ core. It can be in materials either 3C81, 3C90, 3C91, 3C94, 3C95, 3C96 or 3F3.

How do we know which is best suited to 70KHz?

Ferroxcube PQ4040 datasheet
https://ferroxcube.home.pl/prod/assets/pq4040.pdf

 

[KlausST]

Hi,

On page 60 the top table shows the frequency range.

And to each material you find charts with frequency.

To find "the best" is difficult, because for one person "small size" matters, for the other "low loss" and the next "low prize".

Klaus