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Should PFC controller have capacitor on the multiplier output? (it outputs a current)

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cupoftea

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Hi,
Pg 1 shows a 3n3 cap on the IMO pin of UCC28070A PFC controller….
https://www.ti.com/lit/df/slur033/s...87812&ref_url=https%3A%2F%2Fwww.google.com%2F

However, IMO is a current output, which determines the instantaneous Boost choke current, so surely a capacitor here is not wanted?
None of the other UCC28070A app notes show a cap on IMO… eg pg 17 of the following

UCC28070A datasheet
 

A capacitor would have a gain and phase relationship so unless its specifically stated as required i would follow the datasheet and perhaps put a ceramic cap footprint on the board just in case should you want to evaluate its impact. Any cap would probably need to be small (pF) based on the datasheet
 
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