150Uh wanted on etd34

[nigelwright7557]

Does anyone know how to calculate inductance on a etd34 core ?

I cant seem to find any spreadsheets or info on this.

I have a etd54 core used for an llc smps and that is about 50uH per turn.

I could of course just suck it and see. But it would be academic to know how to work it out.

 

[powerbob]

150uH wanted on etd34

You need to know the Al value for the ferrite material you have. Here is a chart of Al values for Ferroxcube ferrites and ETD34 core.

Turns = 1000 x the square root of (L in mH / Al in nH)

For 3C90 ferrite, Al = 2700

You want 150uH = .150mH

Turns = 1000 x the square root of (L in mH = .150 / Al in nH = 2700)

Turns = 1000 x the square root of (.150 / 2700)

Turns = 1000 x the square root of (.000,055,6)

Turns = 1000 x (.007,45)

Turns = 7.45 turns, for 3C90 material and ETD34 core.

 

[nigelwright7557]

Thank you.