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Original question:

BQ76940: Charging Current and Load Connections

BQ76940: charging current

SAPTARSHI BISWAS
Prodigy 110 points
Part Number: BQ76940


HI,

1. During Cell Charging through BQ76940, how Charging Current will be controlled- EIther through Balanced Charger (CC) or 76940IC takes care of CC and then switch to CV mode?

2. in On of the reference design, there is mention of Vplat , I Tap . What are these? are they predefined values or measured from the system?

Regards

Saptarsihi

  • 0
    TI__Mastermind 25980 points

    Hi Saptarsihi,

    1. The BQ76940 does not control the charging current or voltage. It will only disable the CHG FET to block any charging current in the event of a fault. The current/voltage would be controlled by a separate charger IC.

    2. It looks like Vplat is the minimum threshold for cell balancing; if any cell voltages are below this threshold, then the device will not enable cell balancing. I Tap looks like it is the threshold for the charge cycle to finish; when the measured charge current is below this threshold, the system determines that the charging cycle has finished.

    Regards,

    Max Verboncoeur