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ISO6720: Modify Pulse width in each period

Hideki Hayashi1
Expert 8710 points
Part Number: ISO6720


Tool/software:

Hi team,

customer wants to change output pulse width in each period. Is the pulse width is changed in liniear? OR it is updated by every 20ns (1/50MHz)? 

Best regards,

Hayashi

  • 0
    TI__Mastermind 18525 points

    Hi Hayashi-san, 

    Thank you for your question. 

    I do not quite understand your question. Can you please elaborate on what the customer would like to do?

    Regards,
    Aaditya Vittal

  • 0 in reply to Aaditya V.
    TI__Expert 8710 points

    Hi Aaditya,

    I would like to ask about the resolution of PWM ON time.

    Let me bring a example.

    When primary side input is 20ns in first period, then 21ns in 2nd period, then 22ns in 3rd period, and lastly 60ns in 41st period, is the output same as primary input?

    OR it's become 20ns in first, 2nd, 3rd,..., 20th period, then 40ns in 21st, 22nd,..40th period, then 60ns in 41st period?

    Best regards,

    Hayashi

  • 0 in reply to Hideki Hayashi1
    TI__Mastermind 18525 points

    Hi Hayashi-san, 

    Thank you for the clarification.

    Hideki Hayashi1 said:
    When primary side input is 20ns in first period, then 21ns in 2nd period, then 22ns in 3rd period, and lastly 60ns in 41st period, is the output same as primary input?

    Yes you are correct. The output will follow the primary input. Some specifications you may have to consider is minimum pulse width and pulse width distortion. As stated in the datasheet, the minimum pulse width is 20ns and the pulse width distortion is 0.2-7ns. Please see image below:

    Regards,
    Aaditya Vittal