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Micrometals PFC torroid inductor calculation

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cupoftea

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Hi,
Just done Torroid (SH134060-2) with 34 turns which gives L0 = 51uH
And At 5.6Amps L = 43uH
However, their inductor calculator says 34 turns gives L0 = 117uH and L = 100uH at 5.6 Amps.

I used the permeability coefficient given on page 32 of their application guide.

Can you confirm? I hope their coefficiencts arent wrong elsewhere too?

SH134060-2

Micrometals application guide
 

Al value according to catalog is 102 nH, thus 118 uH nominal inductance for 34 turns. If you measure different value, it's probably other core.
 
Thanks, yes i forgot to update the permeability value in the template i'd made out
 

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  • Mag inc coeffs frm.zip
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With the AL value, the inductance is very quickly and accurately calculated as FvM as already stated above in post #2.
 
Thanks yes, thats only the AL value at zero current.
Yes, definitely. A plot is provided in the datasheet for AL value Vs Ampere-turns. You could read the AL value for your Ampere-turns from there. The method of calculating inductance from the AL value is the same.
 

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