BQ76940: Discharge Current

Tan11

Part Number: BQ76940

Hi everyone.
I am working with this IC (BQ76940) and i have a question:
When one of the battery in the pack have higher voltage than the others, how to discharge current flow?
I use external P Channel FET like picture below.
Thank for your help!

over 7 years ago

0 WM5295 over 7 years ago

TI__Guru 54715 points

Hi Tan,
If the MCU attached to the bq76940 determines that the cell should be balanced, it can turn on the appropriate bit to balance the cell. The MCU should watch the voltage and turn the bit off as well.
Current will flow as shown in th application note www.ti.com/.../slua749a.pdf section 4, see figure 5.

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BQ76940: Discharge Current