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UCC28070 / VSENSE and VINAC Open Circuit Protection

K.Yaita
Guru 29720 points
Other Parts Discussed in Thread: UCC28070

Hi Team,

UCC28070 datasheet shows the following.
-----------------------------------
(page.19)
VSENSE and VINAC Open Circuit Protection
Both the VSENSE and VINAC pins have been designed with an internal 250-nA current sink to ensure that in the
event of an open circuit at either pin, the voltage is not left undefined, and the UCC28070 remains in a “safe”
operating mode.
-----------------------------------
If either pin is open, How does the state of PFC output become?
Could you tell me detail of the “safe” operating mode?

Best Regards,
Yaita / Japan disty