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Original question:

TLC555-Q1: High Accuracy version

TLC555-Q1: TLC555-Q1 frequency drift?

PYTsai
Genius 9325 points
Part Number: TLC555-Q1

Hi 

My customer plan to use datasheet reference circuit for generate PWM output . 

From the datasheet we can not find any information for the frequency drift. 

Can you provide the frequency drift information of below circuit ?  

  • 0
    TI__Mastermind 25513 points

    Hello,

    According to the datasheet, the timer itself has an initial error of 1% TYP, and 3% MAX at 25C. Unfortunately we don't have data for frequency drift of the part over temperature. However, drift is also going to rely heavily on the temperature coefficients of the resistors and the capacitors used in your circuit. There are some more details in this forum post.

    In addition, this snip from the astable FAQ, talks about accuracy and timing variation. 

    If you are looking for full temperature accuracy better than 5% (with ideal external components), the you may consider another solution. 

    Best,

    Katlynne Jones