• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Subscribers 63 subscribers
  • Views 552 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

[FAQ] BQ25720: How to set maximum input current limit?

Clever Zhao
Prodigy 10 points
Part Number: BQ25720

Hi，

     How to understand the description about “nominal or typical input current limit” and “maximum input current limit”，which one is the actual input current limit？How to add“100mA/200mA offset” to calculate the “maximum input current limit”？

It would be greatly appreciated if you could provide an example.

Thanks

  • +1
    TI__Mastermind 33135 points

    Hi Clever,

    Thanks for your feedback. I agree this section is ambiguous. 

    Let us use 10-mohm current sense as an example. 

    1. There is no offset for the input current limit, the charger has a low clamp at 50mA, so if you set input current to 0mA, it is clamped at 50mA.  

    • User input,  charge setting
    • 0mA, => 50mA;
    • 50mA, 50mA
    • 100mA, 100mA
    • ...

    2. Note this current is typical input current limit. Since the charger has a part-to-part tolerance of +/-100mA. If the user sets a typical 2900mA input current limit, you could get below input current range. (REG0x3F() = 0x3A00H)

    • min, typ, max
    • 2800mA, 2900mA, 3000mA

    TI suggests considering this parameter variation in the design process. For example, the customer may set the current limit higher purposely. 

    I hope this clarifies your confusion. 

    Regards,

    Tiger

  • 0 in reply to Tiger Zhou
    Prodigy 10 points

    Hi, Tiger

         Thank you for your thoughtful answer. It‘s crystal clear to me now.

         Best regards，

        Clever