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UC1843: shutdown using COMP

George Zhao
Intellectual 1635 points
Part Number: UC1843

Hi team,

I understand that the device can be shutdown by pulling down the COMP voltage to lower than 2 diodes drops. But I wonder what is the specific voltage drop in this situation? because if I use a transistor to pull down the COMP, there might be some voltage cross the transistor and causing the shutdown to fail. Thanks!

George

  • 0
    TI__Mastermind 26215 points

    Hey George,

    I have found in the past that the values is approximately around 1.2 V, although this is not a guaranteed value.

    I will say that I have heard of people using the method you are describing and have yet to hear complaints about the shutdown not happening due to the drop across the transistor.

    Thanks,

    Daniel