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BQ76PL455A-Q1: have inconsistent power consumption issue

user5195153
Intellectual 450 points
Part Number: BQ76PL455A-Q1
Other Parts Discussed in Thread: BQ76PL455A

Dears,

We use 6PCS bq76pl455a-Q1 series connection in one battery PACK,for EV BMS application,it's a all in one BMS design,as below picture:

we test find the last one PCS BQ76PL455A who furthest away from the MCU,have a lower power dissipation compare with others, about 2mA current lower. We add some resistance to dissipation this,but can not make the 6 PCS bq76pl455a a fully power consumption consistent,this issue will impact battery behavior.

So, we want to get some better soluation to solve it,whether TI have optimized on this?

Thanks!

  • 0
    TI__Genius 17370 points
    Hi user,

    Thanks for the question and I will get back to you shortly, please be patient as many of us are on business travel.

    Regards,

    Taylor
  • 0 in reply to Taylor Vogt
    TI__Genius 10785 points
    Hi User,

    I think your approach is proper way. Your board #1 will have least power consumption due to less communication traffics compares to other 5.
    I think adding a resistor to burn extra 2mA is one of option. You can control the GPIO with a command.
    So, you will turn on the GPIO (add 2mA load) and then do your communication.

    Try this and let us know.

    Thanks

    Roger