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UCC21225A: The electrical clearence of UCC21225A

Part Number: UCC21225A
Other Parts Discussed in Thread: UCC21530, UCC21540


According to Datasheet of UCC21225A, the internal functional isolation between the two secondary side drivers allows working voltage up to 700-VDC.

And the distance of the two secondary side is 1mm,the figure is shwon below. But this spacing cannot meet the distance requirements of IEC standard.

How to explain and deal with it?