y capacitor

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Hi,
I designed a flyback converter by pi expert, it put y capacitor between ground of secondary side and positive side of primary . But y capacitors is always are between two grounds .Why is it put here? I attached the schematic.
Regards,

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TOPSwitch-HX_PIDesign5.pdf52.36 KB

Hi Zahra,

The Y capacitor (EMI cap between primary and secondary) can be connected from the primary (+ or -) to the secondary (+ or -), as long as it passes EMI and safety requirements. Our initial consideration is usually the layout, so we connect it on the most convenient and shortest possible path. It is good to verify EMI performance, however, to insure the selected placement satisfies your particular design.

-PI-ODO

Hi,
thanks for your help.
Regards,
Zahra