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UCC28911: Vbrownout voltage

Part Number: UCC28911

Hi team,

Referring to the application note of snva750, the Vbrownout = 43V at the equation (1). Could you give me comment on how to derive the value as 43V? The lowest input voltage looks to be came from 85Vac, and the datasheet shows only typical 70V as brownout voltage. 

Best regards,

Takeshi Sasaki