• State TI Thinks Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 2 answers
  • Subscribers 64 subscribers
  • Views 197 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

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.

TPS2111: current limit setting accuracy

yf liao
Expert 1080 points
Part Number: TPS2111

Hi, regarding the current limit settings, I have some questions, please advise.

  1. what's the behavior of the TPS2111 when loading exceeds the current limit? Switched off output or maintain max. current avaiable (1.5A)?
  2. If I set the RILIM to 300ohm, then the current limit per datasheet calculation is 500/300=1.66A typ. Then what is the tolerance under this setting? Datasheet only give the tolerance with RILIM 400ohm and 700ohm, I want to know the accuracy with 300ohm. 
  3. If RILIM is 300ohm, does 1.66A typ. take effect? Or the max. current can provide is still 1.5A?
  • 0
    TI__Genius 13300 points

    Hello Liao,

    It regulates the current at the set current limit value.

    The accuracy will either be the same or better than 400Ω setting. Generally with current limiting devices the larger the current you're limiting at the better the accuracy.

    The recommended current limit range to set is below:

    It's not recommended to set a current limit beyond this value or parameters in the datasheet regarding the current limit will not be guaranteed; however, if you were to set it at 1.66A the device would limit in that range, not at 1.5A. 

    Regards,

    Kalin Burnside

  • 0 in reply to Kalin Burnside
    Expert 1080 points

    Hello Kalin, thanks for your answer. One thing to double confirm with you:

    in datasheet, 700ohm setting current limit accuracy is actually better than 400ohm, it seems contradict with your comment that the larger the current is set, the better the accuracy is. 

  • 0 in reply to yf liao
    TI__Genius 13300 points

    Hello Liao,

    (0.99-0.71)/0.71 = 39.4%

    (1.56-1.25)/1.25 = 24.8%

    The accuracy is better at higher currents. If you look at the percentage rather than the mV difference it will make more sense.

    Regards,

    Kalin Burnside