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UCC28056: VOSNS terminal OPEN/SHORT-Circuit

user6455458
Prodigy 140 points
Part Number: UCC28056

To Whom It May Concern

I am using UCC28056A.

What happens to the output voltage when the VOSNS terminal is in the following state?

① When the VOSNS terminal is open.

② When the VOSNS terminal is short-circuited with the ZCD / CD terminal.

③ When the VOSNS terminal is short-circuited with GND.

Is there a function to protect these?

Will UCC28056A damage the output electrolytic capacitor because it has no OVP2 protection?

  • 0
    TI__Genius 9790 points

    Hi, There

    Thanks for your interest in TI here. I will be happy to route your request into the appropriate expert to support. Please expect a response by end of day Thursday at the latest.

    BR,

    Yunsheng

  • 0 in reply to Yunsheng Qu
    TI__Genius 9140 points

    Hi Seto,

    for Vosense shorted to GND,PFC output votlage will increase and that may cause output electrolytic capacitor to be over votlage demage.

    for Vosense open pin and shorted to ZCD/CS, it should be the same as shorted to GND.

    there is no way to protect the electrolytic capacitor if you do not add external OVP2.

    hope this is clear.