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TPS22810-Q1: TPS22810-Q1 rise time fomura

Tomohiro Nagasawa58
Expert 1570 points
Part Number: TPS22810-Q1

Dear support team

Seeing the data sheet, Rise time(us) of 10%→90% seems to be calculated by Vin×0.8/SR.

Is there any formula to estimate Rise time of 0%→100%?

It will be helpful if it is as accurate as possible.

Regards

Tomohiro Nagasawa

  • 0
    TI__Genius 10855 points
    Hi Nagasawa-san,

    Thanks for reaching out on E2E!

    We don't spec a formula to estimate the rise time from 0% --> 100%. However, you can simply take the existing rise time from 10% -->90% and multiply it by 1.2X to get an approximate value.

    Thanks,
    Arthur Huang
  • 0 in reply to Alpha H
    Expert 1570 points

    Hello Authur-san

    Thank you for quick response.

    Rise time from 0% to 100% seems to be slow compared to the calculation you received and the actual waveform below.  

    Is there any way to predict accuracy more?

    Regards

    Tomohiro Nagasawa

  • 0 in reply to Tomohiro Nagasawa58
    TI__Genius 10855 points

    Hi Nagasawa-san, 

    Since the rise time can vary more with CSS capacitor variance, load resistance, and process/temperature variance, the values provided in the datasheet are only the "typical" rise time values. Unfortunately we don't have a way to predict the accuracy more due to the variables listed above.

    Is there a specific timing window you're trying to achieve? 

    Thanks,

    Arthur Huang

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