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Transformer calculations

Hi,

I am current working through the following document issued by TI

http://www.ti.com/lit/ml/slup126/slup126.pdf

How have they come up with the window area, breadth etc? Step 6

  •  The window area, breadth, height and MLT(mean length turn) are all specified on the data sheet for the coilformer.

    For example, I attached a page from the data sheet for the ETD34.

    Window area is specified as 123mm2

    The other parameters need to be calculated from the drawing for the bobbin geometry.