• State
  • Locked Locked
  • Replies 1 reply
  • Subscribers 61 subscribers
  • Views 126 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

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.

BQ24780S: The battery can not be charged at the charging current set in Charge Current ()

Tomoya Yoshino
Prodigy 60 points
Part Number: BQ24780S

Hello experts.

I set Charge Current () to 2816 mA and Charge Voltage () to 16880 mV to start charging.

However, when the battery voltage is 13200 mV, the charging current is about 1600 mA.

Furthermore, as the battery voltage increases, the charging current decreases.

It's like constant power control at about 21 W.

Do you understand why this happens?

Is it an error in register settings or selection of circuit components?

The battery can not be charged at the charging current set in Charge Current ().xlsx

Thanks and best regards.

Tomoya Yoshino

  • 0
    TI__Expert 7066 points

    Hello Tomoyo,

    Please refer to section 7.4.1 Battery Charging of the datasheet

    When the battery voltage increases and begins to reach the same level as the charging voltage, the charging current begins to decrease. It's strange that the current begins to decrease at that low voltage level. Can you provide me with more information.

    What is the input current/voltage?

    Can you measure the voltage across both of the current sense resistors?

    Can you provide me with you schematic?

     

    Best Regards,

    Christian.