Y capacitor in 200W Offline Two Transistor Forward?

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treez

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Hi,
Where is the best place to put the Y cap in this offline 200W Two Transistor Forward? (as attached) Position A or B?

The switch current is sensed by the secondary side controller from a secondary side CST as shown.
(sorry for missing out the PFC stage for sake of brevity)
 

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Position-A is adequate..
 
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    T

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Thanks, i must confess i worried about A because it seemed to be drawing the noise through the CST primary.
 

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