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BQ76930: OCD level in 10s and SLUCC539 availability

Anthony Scarnici1
Prodigy 50 points
Part Number: BQ76930

I have a 10 cell pack capable of delivering 100A at 37V, and a system with a max load of 1kW. I'm designing a BMS using the BQ76930 and based on current consumption needs, I chose a 2mOhm RSENS. I need to set my OCD to trip at 70A, but that means OCD is 140mV, and this chip's highest rating is 100mV. Is there a better BSM chip out there to handle this value? it seems that the OCD levels for this series are all the same... Or is there something I missed? 

Further, when I clicked the link to get the SLUCC539 programming software, the page is missing. 

  • 0
    TI__Guru* 81034 points

    Hi Anthony,

    For a 100A current, a 2mOhm sense resistor seems too high. If you choose a lower sense resistor value, you should be able to meet your current needs as well as your OCD and SCD threshold settings. The BQ76930 can work with very high current applications - it is the sense resistor selection that determines the current needs.

    When you click on the SLUC539, it should automatically save the zip file to your Downloads folder.

    Best regards,

    Matt