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TPS2483: TPS2483

Bill Meyer
Prodigy 20 points

Part Number: TPS2483
Other Parts Discussed in Thread: BQ76930, BQ78350-R1A, BQ76942, BQ77915, BQ76200

I would like to use the TPS2483 in a swappable battery design. However, while hot swap controller will be on the main board and the hot swap controller will need to support a battery charging function. So, the current sense voltage will be negative as compared to when the battery is being discharged. Can the hot swap controller tolerate a negative current sense voltage? If so, can the controller shut off the FET if current is too high? If this controller can't support, can you recommend a hot swap controller which can support this function and tolerate Vin < 30V?

  • 0
    TI__Guru** 107821 points

    Hi Bill,

    Welcome to E2E!

    The differential voltage between VCC and SENSE pins should be limited to +/-0.3V. None of our controllers provide protection in the return path. One option is to use a current sense amplifier (INA device) and turn-off TPS2483 

    Can you help with some more details.. What is the battery voltage range ? which protection features are needed in reverse current flow.?

    Best Regards, Rakesh

  • 0 in reply to Rakesh
    TI__Guru** 107821 points

    Hi Bill,

    Any update on the requested details.. What is the battery voltage range ? which protection features are needed in reverse current flow.?

    Best Regards, Rakesh

  • 0 in reply to Rakesh
    Prodigy 20 points

    Hello Rakesh: The battery voltage is 29.4V max. I want to protect against an over current condition. I was wondering if I can rely on the bq76930 fuel gauge to sense an over current charge current condition and protect by turning off the charge and discharge FET instead of adding an IC in series with the battery rail. Although, I would need the bq76930 to auto restart. I searched through the TRM and couldn't find if the bq76930 supported auto restart. If so, this would serve my purpose. 

  • 0 in reply to Bill Meyer
    TI__Guru** 107821 points

    Hi Bill,

    Thanks for the details. I am looping in bq76930 team to comment on your design approach and questions on bq76930.

    Best Regards, Rakesh

  • 0 in reply to Rakesh
    TI__Guru* 81035 points

    Hi Bill, 

    The BQ76930 might be overkill for what you are trying to accomplish. The BQ76930 needs a host controller (either a microcontroller or the BQ78350-R1A) to recover from fault conditions. I am wondering if the BQ77915 might be a better fit. The BQ76942 is most flexible, but it also either needs a microcontroller or you can program the OTP of this device in your production line to operate in stand-alone mode.

    Best regards,

    Matt

  • 0 in reply to Matt Sunna
    Prodigy 20 points

    Hello Matt: Sorry for the late response. I was traveling and don't have access to this email. The is an already completed battery pack design. Infact, it uses the bq78350DBT. Does that help?  To completely open, this design uses the bq76200 for FET control, bq78930 for balancing and current control and, finally, bg78350 DBT for interface.  Comments with regards to auto recover? 

  • 0 in reply to Bill Meyer
    TI__Guru* 81035 points

    Hi Bill,

    I understand. Let me see if I understand what you are trying to accomplish. You want to turn off both FETs during an overcurrent during charge condition by disabling both the CHG and DSG FETs (instead of only disabling the CHG FET)? There is a bit in the Protections register of the BQ78350-R1A that may be helpful ([CC_DSG_OFF]).

    And by auto restart, do you mean automatically recover from the overcurrent protection when the condition goes away? Table 3.4 of the BQ78350-R1A TRM shows how the automatic recovery works. Are are you looking for something different?

    Thanks,

    Matt

  • 0 in reply to Matt Sunna
    Prodigy 20 points

    Hello Matt: Basically, i am looking to auto recover. At least a few attempts before giving up and keep the FET off until microcontroller intervention. Let me look at Table 3.4.