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BQ24133EVM-715-15V: BQ24133EVM-715-15V

Rohan Shevade
Prodigy 50 points
Part Number: BQ24133EVM-715-15V

<urgent>

I wish to charge a 7.4 V ,2200mAh battery (Lithium-ion) (2S1P battery pack) with the BQ24133EVM-715-15V board , with the help of a dc power supply.How do I go about it? Vsys should be connected to a dc-dc converter to convert it to 3.3V. Please help with connection and debugging procedure.

  • 0
    TI__Expert 8690 points
    Hi Rohan,

    You need to change the following:
    1. ISET = change resistor divider for charging current regulation (page 16 of datasheet)
    2. ACSET = change resistor divider for input current regulation (page 17 of datasheet)
    3. OVPSET = change resistor divider for OVP setting for your adapter (operating range is set to 6V to 18V in the EVM)
    4. CELL = JP5 to float for 2 cell charging
    5. TS = change jumper J1 to Int

    Regards,
    Steven
  • 0 in reply to Steven Bangdiwala
    Prodigy 50 points
    Thanks, but I'm using the EVM board. It has the following inputs& outputs:
    Vin
    PGND
    VBAT
    Vsys
    Ts_ext .
    I'm referring to the user manual , can't figure out how to charge it
  • 0 in reply to Rohan Shevade
    TI__Expert 8690 points
    Rohan,

    VIN = adapter (you may have to strip + and - from the cables)
    VBAT = + of the battery
    VSYS = 3.3V regulator input
    TS_ext = battery thermistor
    PGND = negative of adapter and negative of the battery

    What in specific do you not understand on how to connect these?

    Regards,
    Steven
  • 0 in reply to Steven Bangdiwala
    Prodigy 50 points

    Yes , I tried connecting as you said. But that isn't charging the battery. Please refer to page number 6 of the user guide. Why does it say that load should be 30V (or greater) ,5A(or greater) ? The load is the battery to be charged , isn't it?

    I used Vin as 12V and tried to follow procedure given in 2.7 (Please refer user guide).

    2.7.1 and 2.7.2 are working as expected. But results in expected in 2.7.3 are not obtained.

    VBAT was 0.15V (should be 8V for 16 V input)

    and LED was blinking (It should be HIGH) .

    Also, please tell me what the jumper positions should be!

    I am not using external thermostat.

    Question: Is it possible to make any changes to the values of V(ISET) on the board?

  • 0 in reply to Steven Bangdiwala
    Prodigy 50 points

    Came across a related post .

    How was the board 'configured' to get desired V(ISET) ?

    Attaching screenshot of the post!

    Thankyou.

  • 0 in reply to Rohan Shevade
    TI__Expert 8690 points
    Hi Rohan,

    You only need to change jumper JP1 to Int, remove JP5 and insert JP4. After that, if you have a valid VIN (12V is fine) and a battery connected to VBAT (2 cell battery 7.4V), you should be good.

    To change VISET, you will have to change resistor divider R30 and R32 based on the formula in page 16 of our datasheet.

    Regards,
    Steven
  • 0 in reply to Steven Bangdiwala
    Prodigy 50 points

    Hi Steven,

    Thanks for the help. I was following the exact same procedure , but the battery wasn't charging.Turns out that the IC was damaged. It worked fine after replacing the IC.

    Thanks :)