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Winding offline flyback transformer for low leakage?

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eem2am

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i want to do offline isolated flyback, but i want to make the flyback transformer with as little leakage as possible.

Does this mean that i should use a transformer with a long core, so that i can wind the primary as two single windings , covering exactly the length of the bobbin core.

......and in order to further reduce leakage, i should have the secondary winding in between the two primary halves?
 

I don't think, that a long core offers particular advantage. (I don't see it intuitivly, but I didn't try). Interlaced split windings are a common method to reduce leak inductance. If you can get a copy of Snelling Soft Ferrites, it has a chapter about windings, also discussing leak inductance minimization.

For a flyback transformer, the position of the air gap can be expected to have on influence on leak inductance.
 

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