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TIDA-00792: Features

Kanidu Marasinghege
Prodigy 20 points
Part Number: TIDA-00792
Other Parts Discussed in Thread: BQ76940, BQ78350-R1, BQ76930, BQ76200

Hello
May i please know the following regarding the Multi-cell 36-48V (TIDA-00792) reference design.
1. Whether it can operate without an external Micro-controller
2. Can it be used for 6 cells in series
3.  What is the continuous current it can handle 
4. What can we do for the unused cells (if all 12-15 cells are not used )
Thank You
  • 0
    TI__Guru* 81035 points

    Hi Kanidu,

    An external Micro-controller is not required. The BQ76940 battery monitor IC does require a controller, but the BQ78350-R1 device is used for this purpose on TIDA-00792. 

    If you want to use 6 cells in series, I recommend using the same TI design, but use the BQ76930 (10S) instead of the BQ76940 (15S).

    The continuous current is determined by the sense resistor and FET selection. Many applications use multiple FETs in parallel to handle higher currents. There is an app note on the BQ76200 that shows many examples. https://www.ti.com/lit/pdf/slva729 

    The datasheet for the BQ76940 has a section on how to connect the unused cell inputs. See section 11.1 of the datasheet.

    This video might be helpful: https://training.ti.com/how-create-schematic-bq76920-bq76930-and-bq76940 

    Best regards,

    Matt