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UCC28950 / secondary side controller

Guru 29720 points
Other Parts Discussed in Thread: UCC28950
Hi,
 
I have a simple question of UCC28950.
In datasheet and application note, UCC28950 is placed on the secondary side of the full bridge.
Is there any advantages of this position(secondary side)?
 
I also see UCC28950 can be used on primary side in the thread below.
However, I would like to know advantages and disadvantages of the position.
 
Yaita / Japan disty