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LM5021: It keeps to work when main power supply turns off

Takanori Yuzawa
Intellectual 1490 points
Part Number: LM5021

Hi team

When control and main power turns off, then it keeps to remain around 11V.
It keeps to work because of 11V. Could you let me know how to stop working?

Please see the attached file.
LM5021.xlsx
Best Regards,
Takanori Yuzawa

  • 0
    TI__Genius 9710 points
    Dear Yuzawa-san,

    Base on your file, you have one switch on the top which is on. Another switch on the bottom which is off.
    The 17V output is also connect to 26V output's input which cause 11V output during turnoff.

    If my understanding is correct, I think you can utilize the UVLO function which the turn off threshold is 7.25V.

    Best Regards
    Kevin