• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 63 subscribers
  • Views 373 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.

BQ24650: About "Disable Precharge Mode"

ACGUY
Guru 11170 points
Part Number: BQ24650

Hello E2E,

Our customer looked SLVA473 and they tried "Disable Precharge Mode" circuit.
Attached file, fig.3(a)
The device doesn't battery detecting operate.
Is it normal operation?

Regards,
ACGUY

7608.Reducing Precharge Phase Region for bq24650.pdf

  • +1
    TI__Mastermind 40305 points

    Hello,

    If you permanently bias the VFB pin to be above LOWV, then the charger will always detect a battery. This is because when the 8 mA discharge current is applied the proposed circuit will clamp the VFB pin above LOWV and max out the 1s timer.

    I would recommend designing the circuit such that the VFB is biased mostly above LOWV (which will depend on what output voltage you want to start fast charge), but can drop below LOWV as well under certain battery voltages. This way, the lower check of battery detection can work.

    Thanks,

    Mike Emanuel

    Please click "Resolved" if this answered your question.