Why is TEA19161 PFC voltage unstable with 90Vac input?
You can check your schematic according attached calculation sheet.
By the way, I meant to type 19162, not 19161. The 90Vac instability has been identified as:
SNSMAINS pin magnetic field susceptibility from integrated LLC xfmr magnetic field leakage.
Must use NM (not mounted) SNSMAINS cap, to prevent instability.
I also suggest you read AN11801 page116 for the PCB layout of SNSMAINS pin.
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