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BQ25713B: Inquiry about On/Off Issue

Michael Jeong1
Expert 2630 points
Part Number: BQ25713B

Dear Sir,

Our customer had an issue that VSYS was not output intermittently when they repeatedly tested whether VBUS 12V is inserted or not.

The condition is when battery is not connected to BQ25713B.

But there is no problem when battery is connected.

Could you please give me some guide and resolution?

Also, Pls check below schematic.

Best Regards,

Michael

  • 0
    TI__Expert 4285 points

    Hi Michael,

    Can you describe in detail how VSYS responded? for example, what's the expected value(from register setting) and actual value at VSYS? Did charger detect any fault when you have VSYS problem?

    Best Regards,

    Linhong 

  • 0 in reply to Linhong Qin
    Expert 2630 points

    Hi Linhong,

    Thanks for your kind reply.

    VSYS is not output which is 0 voltage.

    There is no switching.

    Here is test procedure like below.

    1'st : They supply VBUS 12V to our device. At this time, Our device is work well.

    2'nd : They don't supply VBUS 12V to our device. In other words, VBUS 12V is not inserted in our device.

    3'rd : They supply VBUS 12V to our device again within about 0.5sec or 1sec after 2'nd procedure.

    I think that their VBUS On/Off time is too short.

    Does our device have a interval time from VBUS off to on?

    Pls let me know your opinion.

    Best Regards,

    Michael

  • 0 in reply to Michael Jeong1
    TI__Expert 4285 points

    Hi Michael,

    I agree with you. Problem might be caused by fast plug/unplug. Charger needs some time to initialize the settings, Please refer to Fig.48 in datasheet. Some init might have been messed up during fast plug/unplug.

    Another evidence is, as you said it worked well with battery connected, which provides a steady state for charge.

    What's the key care-about for the application? maybe we can find a workaround for it.

    Best Regards,

    Linhong