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Original question:

BQ25606: Questions related to Custom Battery charger Design and Schematic Review

BQ25606: If the constant current charging time exceeds 20H, abnormal charging timeout will be reported

Gabriel Wang1
Genius 4725 points
Part Number: BQ25606

Dear Expert

Findings in actual use:

1. The electronic load analog battery (NTC uses 10K resistance grounding) is set to CV mode, the voltage is set to 3.5V, and the board card is connected to the adapter for charging;

2. Observe the electronic load and display the current of about 1A, that is, it is charging at a constant current. Record the charging time at this time to maintain the charging state;

3. After 20H, it is observed that the charging current is still 1A, and the test charging chip STAT pin level is about 0V, indicating the normal charging state

 

Below, I hope you can tell me why the cross-current charging is more than 20H, but the chip still hasn't reported charging abnormality. Thank you!

  • 0
    TI__Genius 10240 points

    Hi Gabriel,

    As you may already know, the timer counts at half clock rate in input voltage or current regulation. The charging safety timer is 10 hour typical and the maximum value could be 12 hours as shown on the datasheet page 7. The timer could be expired at up to 24 hours.

    Best regards,

    Eric 

  • 0 in reply to ezhao
    Genius 4725 points

    Dear Eric

    Thanks for your replying! Attached the schemetic. I tested it again ,it's still charging after 48 hours ,could you help to analyse this .

  • 0 in reply to Gabriel Wang1
    TI__Guru** 105760 points

    Hello Gabriel,

    The timer can be reset by a couple different conditions, do you have a log showing the behavior of the charger during this test? (charge current and voltage)

    You can check the conditions in 8.3.6.1 Autonomous Charging Cycle for some of the conditions.

    Sincerely,

    Wyatt Keller