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BQ40Z60 EVM design AFE fuse

user4546115
Prodigy 170 points

Hi,

according to my understanding the FET (Q7) is not correct. The current that will go trough is much to high, calculated like 2-4 A depending on number of cells and the value of "heater-part" in fuse. The BSS138 can only survive 0.22A.

Your feedback for this will be highly appreciated.

BR
Jan-OlofSFH-0810C implementation.pdf

  • 0
    TI__Guru 73830 points
    You are correct. The FET was placed on the EVM to show the implementation. You will need to size the FET to support your application and fuse.
  • 0 in reply to ThomasCosby
    Prodigy 170 points

    Hi Thomas,

    thank You for prompt reply and clarification to this.

    Based on this I wonder if there are any other "weak spots" that we need to consider for our implementation.

    We intend to follow the reference design in a 2S2P implementation.

    One component we have already replaced, the inductor  is replaced with one that can cope higher current and lower temperature.

    Thank You for good support.

    BR

    Jan-Olof

  • 0 in reply to user4546115
    TI__Guru 73830 points
    Jan-Olof
    I am not aware of any weak points. The EVM BOM is a general set of components that need to be resized to support your specific application. The inductor would be one example. The inductor on the EVM has a saturation current of 5A and will need to be resized to support higher charge currents.

    Tom