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BQ77915: OV protection is not working

Ravi Kumar Sutrai
Prodigy 120 points
Part Number: BQ77915

Tool/software:

Hello Team,

I am design the battery pack for Lifepo4 cell, 14.6V Max

I am creating the OV condition as mention in the EVAL kit user guide with 4 series resistors.

1. I can able to create the undervoltage (Less than 10V) - The output is cut off.  recovery method was to disconnect the load.

2. I can able to create the overvoltage (>Approx 15V), The output is cut off. But after making to Nominal voltage (13V), the output is not recovering.

But datasheet says, the recovery method was the hysteresis. 

I am attaching my schematics, please give me solution to recover from the OV protection.

Thank you,

Regards,

-Ravi.

  • 0
    TI__Mastermind 42060 points

    Hello Ravi,

    Did you lower the voltage further?

    I would check every protection condition and ensure that recovery is achieved for all of it. See Table 9-1. Device Functionality Summary / Table 9-5. Fault Condition, State, and Recovery Methods of the datasheet.

    Best Regards,

    Luis Hernandez Salomon