• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 63 subscribers
  • Views 821 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.

VBUS ripple

John Newell
Intellectual 280 points

VBUS input for the BQ2589x is within the range 3.9 to 14. Is there a spec for PSRR or something which would allow VBUS to come from a 100Hz partially smoothed d.c. adapter with relatively large ( 2-3Vp-p) ripple. Question has been asked for another  device but no answer.

  • 0
    TI__Guru**** 166076 points
    We do not test or specify PSRR for our charger's buck converter. At 100Hz ripple, I would expect our charger, with its >1000Hz feedback loop bandwidth, to be able to filter out the ripple. I would be more concerned about appropriately setting the charger's VINDPM feature so that the charger will not reduce input current limit to zero on a trough.