Reduction of leakage in SMPS transformer.....multiple "sandwich" winding.

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treez

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Page 6-9 of the following says that if a seondary of an offline flyback transformer is wound between two layers of a "split" primary, then the leakage is reduced by a factor of three.

Flyback design:
**broken link removed**

If i split the secondary into two full layer windings, and then interleave these between three layers of a triple-split primary, then by what factor does that reduce leakage inductance?

..By a factor of 6 i presume?
 
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