• Resolved

TPS63070EVM-693: Output Ripple Voltage

Guru 31020 points

Replies: 16

Views: 371

Part Number: TPS63070EVM-693

Hi,

Could you please provide me the screenshot of the output ripple voltage with TPS63070EVM-693 under the following conditions ?

Test Conditions
- VIN  = 4.0V
- VOUT = 5.0V
- Output Load = 1A
- Switching Mode = Forced PWM mode

Best regards,
Kato

  • Hi Sadanori:

    Thanks for asking. I have no such graph at hand. Please wait me do a test.

    I'll share it today if everything going well.

    Best Regards

    Minqiu

  • In reply to Minqiu Xie:

    Hi Minqiu-san,

    Thank you for your quick response.

    I am looking forward to getting the information from you.

    Best regards,
    Kato

  • In reply to Sadanori Kato:

    Hi Kato-san:

    I checked the stock, there is no TPS63070EVM-693. So I do the test based on TPS630702EVM. These two devices and EVMs are highly similar, only the discharge function. Its OK to have a reference.

    Test condition: Vin=4V, Vout=4.95V, Load=1A, mode set: FPWM.  Temp=25℃.

    Best Regards

    Minqiu

  • In reply to Minqiu Xie:

    Hi Minqiu-san,

    Thank you for the information.

    According the screenshot, is the output ripple voltage less than 30mVpp ?
    Could you please meareue the peak to peak voltage just in case ?

    Best regards,
    Kato

  • In reply to Sadanori Kato:

    Hi Minqiu-san,

    I have an additional question, is the output load which you used the electronic load with the current mode ?

    Best regards,
    Kato

  • In reply to Sadanori Kato:

    Hi Kato-san:

    Please check the measurement with cursor. And I use the source meter as the load, in constant current mode.

    Best Regards

    Minqiu

  • In reply to Minqiu Xie:

    Hi Minqiu-san,

    Thank you for your strong support.

    I understood and will contact you if I get additional questions from our customer.

    Best regards,
    Kato

  • In reply to Sadanori Kato:

    Hi Minqiu-san,

    I just got additional questions as follows.

    Q1. Filter Setting for Oscilloscope
    Could you please tell me the filter setting for the oscilloscope ?

    Q2. Remeasurement
    Could you please measure the output ripple voltage with disabling the low pass filter if limiting the bandwidth with the low pass filter ?

    Best regards,
    Kato

  • In reply to Sadanori Kato:

    Hi Kato-san:

    Q1: I used 20MHz before. Generally, the major ripple are in this bandwidth.

    Q2. Please check the graph. The extra high noise could be reduce with a ferrite bead is you care it a lot. 

    Best Regards

    Minqiu

  • In reply to Minqiu Xie:

    Hi Minqiu-san,

    Thank you for the information.

    Adding a ferrite bead to the output is a workaround, but should a π-type filter be formed ?
    Additionally, please tell me the capacitance value to be added.

    Best regards,
    Kato