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PWM of TLC59108

Takahiro Nishizawa
Genius 5575 points
Other Parts Discussed in Thread: TLC59108

I have questions TLC59108.

Question 1.  

     Do you have the data about  following PWM brightness?

             - Rise time and Fall time

             - Delay time

Question 2. 

      Do you have the Waveform data of PWM output?

Question 3. 

      Please tell me the accuracy of  average current with PWM setting.

      We want to know relative accuracy with PWM setting.

      We think that ±8% is the absolute accuracy.

Best regards,

Takahiro Nishizawa

  • 0
    TI__Expert 4445 points

    Hi Takahiro-san,

    Please refer the below answer.

    Q1, I have no data of the Rise time and Fall time with delay time since it is legacy device.

    But i think this should be less 4ns since it can support 8bit PWM @97Khz.

    Q2, I have no waveform in the hand, if you need the waveform I can set up the bench to measure it, But It may take more than 2 weeks since we need to prepare EVM setup.

    Q3. 8% is DC current accurary. The relative accuracy should be less than 0.3% since this device in 8 bit.

    Any other question please let me know.

    Thanks!

    Summer 

  • 0 in reply to Summer SU
    Genius 5575 points
    Dear Summer SU-san


    Thank you for your answer!


    Question 1.

    Does 4ns include rise time and fall time and delay time?


    Question 2.

    We are waiting for your data.


    Question 3.

    Does 0.3% include variation of temperature and ICs?


    We are concerned about the following.

    - Reproduction accuracy of average current ratio when changing duty within about 10 seconds or less
    This accuracy includes variation of temperature and ICs.

    - Relative current error range with PWM setting by variation of temperature and ICs, IC degradation


    Best regards,


    Takahiro Nishizawa
  • 0 in reply to Takahiro Nishizawa
    Genius 5575 points

    Dear Summer SU-san


    Thank you for your help!

    How is the confirmation situation?

    I am waiting for your answer.

    Best regards,

    Takahiro Nishizawa

  • 0 in reply to Takahiro Nishizawa
    TI__Expert 4445 points

    Hi Takahiro-san,

    For the question 1.

    Sorry for the typo error, It shoud be less than 40ns not 4ns including all rising, falling and delay time.

    Question 2,

    We need take more than 2 weeks to measure it, I will send to you after finish it.

    Question 3.

    0.3% is typical value for the duty cycle, temperature just impact frequency, but has no impact the duty.

    For the device, it also same status, the device may has difference frequency, but has no impact the duty.

    Any other question please let me know.

    Thanks!

    Summer

  • 0 in reply to Takahiro Nishizawa
    TI__Expert 4445 points
    Hi Takashiro-san,
    Could you send me your email address then I can send the waveform to you?
    Thanks!
    Summer
  • 0 in reply to Summer SU
    Genius 5575 points
    Dear Summer-san

    Thank you your help.

    My e-mail adress is as follows.

    Takahiro_nishizawa@marubun.co.jp

    I am waitng for waveform data.
    Please send the waveform to this adress.

    Best regards,


    Takahiro Nishizawa