• State
  • Locked Locked
  • Replies 3 replies
  • Subscribers 63 subscribers
  • Views 515 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

BQ76PL455A-Q1: IC burns when battery is connected to charger

Harsh Gugale
Prodigy 240 points
Part Number: BQ76PL455A-Q1

Hello,

I am using bq76pl455AQ1 for EV application.The IC works fine when the battery is not connected to a charger.But due to some reason, it burns when I connect a constant current charger to the battery pack.

Specs: 52 Li-ion cells 13 series and 4 parallel

Constant charging current: 3A

Connections are exactly according to the datasheet specs.LPF contains 1k resistor and 1uF capacitor.

Any help would be highly appreciated

Thank you!

  • 0
    TI__Genius 11480 points

    Harsh,

    Could you share the schematic with d-wiest@ti.com, please? I would just like to double check, and this provides me a starting  point.

    Can you describe which part of the circuit is being damaged? Is it the IC itself (which pins, if you can tell?) Is it the  AFE/balancing  circuit? VP regulator?

  • 0 in reply to David Wiest Jr
    Prodigy 240 points
    Hello David,

    Thanks so much for your response.

    The schematic is exactly the same as that given the datasheet application section with LPF resistor 1k and capacitor as 1uF.I am using FRDM KL25z(works on 3v3) as the MCU for interacting with the IC.The ckt workes fine when charger is not connected.I am not sure which part gets damaged,but it seems that the AFE gets damaged since when I switched on the charger ,the cell voltage values were messed up but still it could communicate with the MCU.

    Regards,

    Harsh
  • 0 in reply to Harsh Gugale
    TI__Genius 11480 points
    Are you using the 6.2V zener diodes between sense inputs? Are you doing any balancing, and if so is there damage to any of those external components?

    Do you have vsense 16,15,14 and 13 shorted together , since you are using a 13S pack?

    Does the problem occur only when charging occurs, or instantly when plugging in?

    You could also try to switch to 100 ohm resistors in the filter, although im not sure this will change your outcome.

    Can you also check to make sure all of the voltage references are at the correct values? That may give us a hint at what happened.