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Multiple output flyback SMPS and prmary leakage inductance
Page 5 (the top left of page 5) of the below document (AN1679/D “How to deal with leakage elements in flyback converters”) says that where a flyback transformer has multiple outputs, then when the outputs are more closely coupled with each other, the leakage inductance as “seen” from the primary actually increases.
However, the diagram of a multiple output flyback transformer that they show (figure 9 , page 4) actually has three “Limbs”. Does the above statement still apply when all the secondaries and the primary are wound round one single limb?....(as is the case with most low power flyback smps transformers.)
AN1679/D:
https://www.onsemi.com/pub_link/Collateral/AN1679-D.PDF
Page 5 (the top left of page 5) of the below document (AN1679/D “How to deal with leakage elements in flyback converters”) says that where a flyback transformer has multiple outputs, then when the outputs are more closely coupled with each other, the leakage inductance as “seen” from the primary actually increases.
However, the diagram of a multiple output flyback transformer that they show (figure 9 , page 4) actually has three “Limbs”. Does the above statement still apply when all the secondaries and the primary are wound round one single limb?....(as is the case with most low power flyback smps transformers.)
AN1679/D:
https://www.onsemi.com/pub_link/Collateral/AN1679-D.PDF