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Original question:

BQ24617: 20A Charging Current

BQ24600: bq24600

jack xu1
Prodigy 160 points
Part Number: BQ24600

If the battery voltage is become 0, we can not charge the battery. If we don't put Rt, thermistor , does it affect the charging or not?

  • 0
    TI__Mastermind 24075 points

    Hi Jack,

       The TS voltage should be within valid range as specified in the EC table of the datasheet. If you are using the default EVM schematic, and you don't want to include a thermistor, you can add a 10k resistor from TS to GND, as this will fix the TS voltage in valid range (you can also use an external power supply). A TS fault would be indicated as a fault by the STAT pin.

  • 0 in reply to Kedar Manishankar
    Prodigy 160 points

    Hi Kedar

    Yes. My design is follow your schematic and put a 10 K Ohm but in case the battery become 0 voltage, your BQ246000 can not charge the battery. .if we put a battery with some voltage, it can recharge the battery. What is the problem?

    Regards

  • 0 in reply to jack xu1
    TI__Mastermind 24075 points

    Hi Jack,

        Where is this 10k resistor used? What is the status of the STAT pin when 0V battery is used? Is charging observed, and then charge stops, or does 0V battery never charge? Does your system include a battery pack, protector or gauge? Please include a scope shot of battery plug in, with channels VCC, SRN, PH. Use 400ms time scale.

  • 0 in reply to Kedar Manishankar
    Prodigy 160 points

    Hi Kedar

    RT is empty. I put a 12 K Ohm to instead of 10 K ohm and it works. Only one thing is in case the battery voltage drop to 0, the charger circuit can not charge the battery. If we change a battery with some voltage, the charger circuit can charge the battery. I use the other vendor charge ICs, it does not have this issue. 

  • 0 in reply to Kedar Manishankar
    Prodigy 160 points

    Hi Kedar

    RT is empty. I put a 12 K Ohm to instead of 10 K ohm and it works. Only one thing is in case the battery voltage drop to 0, the charger circuit can not charge the battery. If we change a battery with some voltage, the charger circuit can charge the battery. I use the other vendor charge ICs, it does not have this issue. 

  • 0 in reply to jack xu1
    TI__Mastermind 24075 points

    Hi Jack,

       Yes adding a 10k resistor in parallel is to ensure a valid TS operating range, so that no TS fault is detected. There should be no issue with charging a 0V deeply discharged battery using BQ24600. To debug can you provide the information from above questions?

    1. What is the status of the STAT pin when 0V battery is used?
    2. Is charging observed, and then charge stops, or does 0V battery never charge?
    3. Does your system include a battery pack, protector or gauge?
    4. Please include a scope shot of battery plug in, with channels VCC, SRN, PH. Use 400ms time scale.

  • 0 in reply to Kedar Manishankar
    Prodigy 160 points

    Hi Kedar

    RT is empty. I put a 12 K Ohm to instead of 10 K ohm and it works. Only one thing is in case the battery voltage drop to 0, the charger circuit can not charge the battery. If we change a battery with some voltage, the charger circuit can charge the battery. I use the other vendor charge ICs, it does not have this issue. 

    We have a battery pack but no gauge. We use another vendor's battery charger ICs to do the similar test which is work

  • 0 in reply to jack xu1
    TI__Mastermind 24075 points

    Hi Jack,

      Thanks for the information.

    1. What is the status of the STAT pin when 0V battery is used?
    2. Is charging observed, and then charge stops, or does 0V battery never charge?
    3. Please include a scope shot of battery plug in, with channels VCC, SRN, PH. Use 400ms time scale. Use 0V battery as you have used in previous tests.