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BQ77915: Load Removal/Detection

Ido David
Prodigy 20 points
Part Number: BQ77915
Other Parts Discussed in Thread: BQ77307

Tool/software:

Hello everyone,

I'm using the BQ7791500 IC in my design and have a question about its "Load Removal/Load Detection" feature.

After a fault occurs, does the load need to be physically removed for recovery, or is this an automatic internal function triggered when the IC detects a change in the LD pin voltage?

Best regards,

Ido

  • 0
    TI__Mastermind 36720 points

    Hello Ido,

    This function is based on the LD voltage, however, the load removed condition would only occur when either:

    • Load is physically removed
    • Charger is attached

    Both of these cases change the LD voltage enough to recover.

    Best Regards,

    Luis Hernandez Salomon

  • 0 in reply to Luis H. S.
    Prodigy 20 points

    Here’s a polished version of your comment for a technical forum:

    Thanks, Luis!

    I understand that most faults require load removal to recover, whether during charging or discharging. However, I have a couple of questions:

    • If an overcurrent charging fault occurs while the charger is connected, is it still necessary to remove the load?
    • Similarly, if an overcurrent discharging fault occurs when the charger is not connected, do I need to physically remove the load to recover?

    Additionally, should I enable load removal detection for UV recovery in this scenario?

    To clarify further, I am working with a closed system where physically removing the load is not possible. Given this limitation:

    • Is the BQ7791500 a suitable choice for my application?
    • Should I consider a different version of this IC?
    • Or should I explore other ICs that better support my system's constraints?

    Any advice would be greatly appreciated!

  • 0 in reply to Ido David
    TI__Mastermind 36720 points

    Hello Ido,

    I am on business travel, allow me to respond on this by Thursday. Apologies for the wait!

    Best Regards,

    Luis Hernandez Salomon

  • +1 in reply to Ido David
    TI__Mastermind 36720 points

    Hello Ido,

    Appreciate your patience!

    Ido David said:
    If an overcurrent charging fault occurs while the charger is connected, is it still necessary to remove the load?

    In that case, it would need to detect a load before it is able to recover. This is described in Section 9.3.2.8 Operation in OCC of the datasheet.

    Ido David said:
    Similarly, if an overcurrent discharging fault occurs when the charger is not connected, do I need to physically remove the load to recover?

    Correct, if the recover option is configured to use load detection.

    Ido David said:
    Is the BQ7791500 a suitable choice for my application?

    You would need to attach a charger to recover in this case.

    Ido David said:
    Should I consider a different version of this IC?

    The BQ7791504 and BQ7791513 seem like they do not have load detection (As per Table 6-2. Device Comparison Table)

    Ido David said:
    Or should I explore other ICs that better support my system's constraints?

    The BQ77307 is another alternative (Without cell balancing). This device does not have load detection. However, you would require to use an MCU if you want to program your protection thresholds.

    Best Regards,

    Luis Hernandez Salomon