• State TI Thinks Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 1 answer
  • Subscribers 63 subscribers
  • Views 324 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.

Original question:

BQ25713: RAC value

BQ25713: ILIM External Input Current Regulation Loop

Eldar Yuzbashev
Prodigy 10 points
Part Number: BQ25713
Other Parts Discussed in Thread: BQ25792

Hello TI Support,

This is a related question to the original "RAC value" question about the BQ25713.

The datasheet is here: https://www.ti.com/lit/gpn/bq25713

Here is the question: The Input Overcurrent reaction time is 250µs (page 15, INPUT OVER CURRENT COMPARATOR (ACOC)). This is too slow for my application. Section 9.6.6.1, 3rd paragraph says "Instead of using the internal DPM loop, the user can build up an external input current regulation loop and have the feedback signal on the ILIM_HIZ pin."

What does this mean? Is the implication here that this external circuit will improve the reaction time? What is an example of this circuit?

Thank you.

Eldar Yuzbashev
  • 0
    TI__Mastermind 33625 points

    Hi Eldar,

    BQ25713 has multiple level of protections against input current overload, such as input current regulation, ACOC, Q2_OCP, ACX_OCP etc. External circuit OCP was unnessary. however, it does not stop the customer constructing their own current comparator and pulling-down the ILIM_HIZ pin. 

    The ACOC 250us deglitch time is intentionally slowed down to avoid repetitive trigger in a dynamic load conditions. Q2_OCP and ACX_OCP protection are responsive. 

    Regards,

    Tiger

  • 0
    Prodigy 10 points

    Hi Tiger, 

    My design requirement is to limit and maintain the input current to 500mA within 10 microseconds of the overcurrent event. What level of protection should I use? Can you please provide an example circuit or description? 

    Thank you, 

    Eldar Yuzbashev 

  • 0 in reply to Eldar Yuzbashev
    TI__Mastermind 33625 points

    Hi Eldar,

    BQ25713 is not the best part for you. Your current is small. Please check out BQ25792. 

    Regards,

    Tiger