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UCC2813-5-Q1: The RC Pin starts to discharge threshold point

Part Number: UCC2813-5-Q1

Tool/software:

Hi Team

It is weird that customer found the device UCC2813QDR-5Q1's RC pin will start to discharge when the Vrc reach to 1.7V but not 2.65V sometimes.

I noticed the DS claimed that UCC2813-X increased 2.65V and the peak-to-peak is 2.45 but 1.7V. 

Can you help to show your insight why this happened?