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LP87524B-Q1: LP87524B-Q1 output undershoot/overshoot issue

Eric Chen4
Expert 2370 points
Part Number: LP87524B-Q1

Hi,

We find LP87524B-Q1 Output voltage that have undershoot/overshoot issue as below.

Would you kindly provide some suggestion to reduce the voltage level?

Now add Snubber circuit but no any improve undershoot/overshoo voltage.

Thanks.

 

Regards,

Eric

  • 0
    TI__Genius 17380 points
    Hi Eric,

    I have assigned the post to the device experts who are located in Europe and should provide a response on Monday regarding the specific device.

    It may help if you can provide information on the components used in the snubber? Not all 390 pF capacitors for example are made equal; the impedance at the ringing frequency will effect how high the ringing is.
  • 0 in reply to Kevin LaRosa
    Expert 2370 points

    Hi Kevin,

    Now used 390PF spec for your check as below.

    Please kindly provide suggestion for our check again about output undershoot/overshoot issue.

    http://www.yageo.com/documents/recent/UPY-GPHC_X7R_6.3V-to-50V_18.pdf

    Thanks.

    Regards,

    Eric

  • 0
    TI__Genius 11020 points

    Hello,

    First thing is to check the measurement setup, especially the oscilloscope probe grounding. Best way is to use spring type GND wire right a the tip of the probe to minimize the loop. Using normal GND wire can cause excessive ringing on oscilloscope screen.

    For optimizing snubber components, here's good application note that walks through the selection process. (it is for boost, but applies for buck as well)

    Hope this helps,

    Regards,

    Tomi Koskela