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BQ76PL455A-Q1: cell unbalancing problem

amol chavan
Prodigy 70 points
Part Number: BQ76PL455A-Q1

Actually we are designing 13 cell 48V battery pack. We almost done but from last 1 month we facing cell unbalancing problem. This board was design by other person and now he left the company and I am new in this field so I am not able to understand how can I solve this problem is this software problem or hardware. because in our firmware while we charge battery pack that time it will balance the cell but now it is not done anything so How I solve this problem.

  • 0
    TI__Mastermind 19795 points
    Hi Amol,

    I am sorry to hear you are running into this trouble. As the process of finding where the issue is can be very daunting, here are my recommendations for narrowing down where the issue lies:

    I would make sure the device is following all of the basic specs from the PL455 datasheet (link: www.ti.com/.../bq76pl455a-q1.pdf). Make sure all the rails are within the correct ranges. Next, I would check the communication lines, and ensure the correct UART frames are being sent/received to and from the PL455 (see the Software Design Reference for correct frames: www.ti.com/.../bq76pl455a-q1.pdf). Then, begin making sure all of the schematic recommendations match that of the datasheet recommendations (correct values, etc). Finally, ensure the layout recommendations match that of the datasheet as well.

    Once you have found the specific issue, let me know, so I can help you further!

    Regards,
    Vince
  • 0 in reply to Vince
    Prodigy 70 points

    sorry for late reply I got files but please tell me how can I go fast ...because this is startup company so they are pushing me so much and I  don't have any training on it..so How can i go fast to solve all problems.

  • 0 in reply to amol chavan
    TI__Genius 10785 points
    YOu have to give us details.
    What do you mean by cell "unbalancing problem"
    What is the cell measurements?

    Did you turn on cell balancing?
    Did you check reference schematic from the datasheet?
    How is your circuit compares to our reference?

    Give us details.