• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 63 subscribers
  • Views 307 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.

TLC59281: Maximum Rref ~ 25.2K / Minimum output currents?

Ed Ramsden
Prodigy 10 points
Part Number: TLC59281


The datasheet shows a graph of output current vs. Rref (Figure 10) with a high value of Rref of 25.2K and output current 2mA.  Can this device be used with higher values of Rref (up to 1Meg?) to get output currents down in the 10's of microamps? If so, what kinds of issues might this create?

  • 0
    TI__Expert 3190 points
    Hi Ramsden,

    Too large resister means too small reference current, which will cause the FET of the current mirror works at the voltage smaller than headroom(knee voltage)
    It will cause the current accuracy problem, also the current will be easily influenced with the channel output voltage disturbing.
    So it is not recommend to configure the output current smaller than 2mA.

    thanks!
    Regards,
    Shawn.