• State
  • Locked Locked
  • Replies 2 replies
  • Subscribers 62 subscribers
  • Views 232 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.

Long cables from charger to battery

Matthieu Imbert
Intellectual 820 points
Other Parts Discussed in Thread: BQ24725A

Hello,

Any known issue with long traces/cables (1m) between the output of the synchronous buck charger (bq24725A) and the battery? Any risk of oscillation due to parasitic inductance of cables/traces? What about hard disconnection of the battery while charge current is high? Any precaution to be taken?

If anyone has been experiencing some of those cases, thanks for letting me know.

Regards.

Matthieu

  • 0
    TI__Guru**** 169756 points
    Yes. The resistive component of the cables will result in the charger entering constant voltage mode earlier, longer time for the current to taper off and therefore longer charge time. Most likely, the equivalent capacitance of a high capacity battery would damp any oscillations from the indudtive component of the cables. But, a hot unplug during high current charging could result in an inductive spike that could damage the charger IC or external components.
  • 0 in reply to Jeff F
    Intellectual 820 points
    Hello Jeff,
    thank you for your answer.
    What would the polarity of the spike be in case of a hot unplug during CC charge? I.E., would a simple power Schottky across the output terminals of the charger be enough to swallow a negative spike ?
    Or would a device like a bidirectionnal Transil be more suited for negative and positive spikes as well?
    If you have any suggestion, Thanks.
    Regards.
    Matthieu.