• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 33 subscribers
  • Views 327 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.

Original question:

TRSF3232E: Different capacitor values

TRSF3232E: Capacitor accuracy

Shunsuke Nagata
Genius 12470 points
Part Number: TRSF3232E

Hi,

My customer would like to know how much accuracy is required for C1 ~C4 due to DC bias or temperature dependency.

As I read https://e2e.ti.com/blogs_/b/analogwire/archive/2018/06/28/how-the-rs-232-transceiver-s-regulated-charge-pump-circuitry-works, C3 should be larger than C1. But could you please give me your advice how percentage should user follow such as C1 = 0.1 +/- ??% uF?

Regards,
Nagata.

  • 0
    TI__Mastermind 25705 points

    Nagata,

    It's a good question. The tolerance of the capacitor is suggested to be +/- 10% or less, especially you're concerned about the ripples of the output voltage. After all it's the ratio of the capacitor value matters. Depending on your application, in general X5R or X7R should be good enough. Since the capacitor share the same temperature coefficient, the absolute variation might not be so critical. The variation due to voltage and frequency is not significant given the application of the working range of the capacitor. I hope this helps, please let me know if you have more questions.

    Regards,

    Hao