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TPS7A8300: Output impeadance

Intellectual 1485 points

Replies: 9

Views: 207

Part Number: TPS7A8300

Hi Team,

My customer asked to provide TPS7A8300 output impedance graph

like inserted below. Could you provide both sim result and actual measurement if it is possible?

Also he would like to be advised about how to measure it generally.

Thanks

Best regards,

Shidara

  • Hi Shidara,

    We measure output impedance using the Bode 100 analyzer from Omicron Labs.

    Bode Analyzer Suite software is used to make the measurement with the Bode 100, set to Impedance Analysis in Voltage/Current mode.

    The method is described in the Omicron Lab Bode 100 - Application Note: Traditional and Non-Invasive Stability Measurements. See the section on Output Impedance Measurement.

    https://www.omicron-lab.com/fileadmin/assets/Bode_100/ApplicationNotes/Noninvasive_Stability/App_Note_Traditional_NoninvasiveStability_V3.0.pdf

    Best,
    Eric Preiss | Lead Validation Engineer | Linear and Low Dropout Regulators | Texas Instruments

  • In reply to Eric.Preiss:

    Hi Eric-san

    Thank you for the advice of measurement.

    The customer want to obtain TPS7A8300 output impedance characteristic

    for the purpose of checking their measurement is no problem compare to TI provided data.

    Could you share it?

    Thanks

    Best regards,

    Shidara

  • In reply to K.Shidara:

    Hi Shidara-san, 

    We only have one bode 100 in the lab. Unfortunately, it has been out for calibration. The calibration process normally takes 2-3 weeks. Currently, we don't have the instrument to take the data on bench. 

    Regards, 
    Jason

  • In reply to Jason Song:

    Hi Jason-san

    Thank you very much for the update of current situation.

    I understood.

    Please support this after returning the calibration process.

    Thanks

    Best regards,

    Shidara

  • In reply to K.Shidara:

    Hi Shidara,

    I will notify you once the instrument returns from calibration. I will update you on 9/15/2019.

    Regards,
    Jason Song

  • In reply to Jason Song:

    Hi Shidara-san,

    We got the intrument back from the calibration. I expect to collect the data for you by 9/30/2019.

    Regards,
    Jason Song

  • In reply to Jason Song:

    Hi Jason-san

    Thank you so much for your support.

    Would you update the current situation?

    Thanks

    Best regards,

    Shidara

  • In reply to K.Shidara:

    Hi Shidara-san,

    I have done the output impedance measurement on TPS7A8300EVM-209 with two output cap configurations;

    A. Cout = default EVM Cout = 3 X 10 uF.

    B. Cout = 22 uF

    Please find measurements in the attached ppt.

    BR,

    HaidarTPS7A8300EVM-209.pptx

     

  • In reply to Haidar Hamoo:

    Hi Haidar-san

    Thank you so much for your strong support.

    Let me share your result with the customer.

    Thanks a lot

    Best regards

    Shidara