• State Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 1 answer
  • Subscribers 63 subscribers
  • Views 824 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

BQ77905: OV and UV Hysteresis accuracy

Victor Chen_HK
Expert 5130 points
Part Number: BQ77905

What is the accuracy(range) of UV and OV Hysteresis?

Data sheet only mentioned the OV Hysteresis is 100mV and UV Hysteresis is 400mV for BQ7790512.

Thanks.

  • 0
    TI__Guru 54715 points
    Hi Victor,
    The bq77905 data sheet shows the basic thresholds for the various protections in table 2 as you highlighted. The accuracy of the thresholds is in the electrical characteristics tables section 7.5, look for the "Protection Accuracies" section
  • 0 in reply to WM5295
    TI__Expert 5130 points
    Thanks for your reply.
    So the hysteresis accuracy of OV and UV over full temp range is also -40mV to +40mV?
    or in another words, the OV hysteresis is 60mV to 140mV and UV hysteresis is 360mV to 440mV?

    Thanks.
  • 0 in reply to Victor Chen_HK
    TI__Guru 54715 points
    Hi Victor,
    The data sheet does not list an accuracy of the hysteresis. I think the pessimistic way to look at is as if trip and recovery were independent thersholds and the maximum error would be twice the threshold error, or +/- 80 mV over temperature. That is most of the 100 mV hysteresis. The 2 likely have a dependency so they should not be this large, but the data sheet does not make it apparent.