Sandwich winding for coupled inductor?

[treez]

Hello

We are doing a 200W Class B power supply with split rail output.

We are using an output coupled inductor so as to get the cross regulation best.

Is it worth sandwich winding the coupled inductor windings (interleaving them) in order to reduce leakage inductance?,

...or is this not really going to really make the cross regulation too much worse if they are simply wound one atop the other?

[Terry Given]

Treez,
yes interleaving would improve coupling. bifilar wind them - its interleaving on a turn-by-turn basis.

its probably redundant as the rails will likely be symmetrical, but dont forget to have the same turns RATIO on the coupled inductor as the transformer secondary