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How to calculate 25kHz transformer powered by sine wave

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kekon

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I have to calculate small transformer which is to be used only to generate voltage which is separated form primary side. The transformer must be powered by sine wave voltage at primary side of about 25kHz and power 0,5...1W. Alhough is seems to be very simple how to calculate such a transformer basing on equations used for oridinal 230V transformers but such calculations, as i think, would not be suitable for this purpose. The transformer i'm going to made has ferrite core E20/10/6 (Ae = 31mm^2, N27 material). The problem is how to calculate the power which can be transferred through a given core (of given AL, Bsat etc.) at higher frequencies such as 25kHz ? And how to calculate needed turns number, primary inductance etc. ?
 

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