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TPS562219A: A drop at ~20KHz in bode plot

Ben Kuo
Expert 6685 points
Part Number: TPS562219A

Dear expert,

We measure bode plot for close loop stability for TPS562219A.

But there is a drop around 20KHz, May I learn from you how to improve this drop?

Schematic and bode plot are in attachments.(note: R315 have been change to 20-ohm)

  • 0
    TI__Expert 4875 points
    Hi Ben,

    The Bode Plot explanation is simple. It has to do with the math that is performed within the Analyzer. If the phase margin ever exceeds 180 degrees positive, the sign of the data gets inversed, and shows up as a negative number. So, the data is not real. You can simply treat it as a positive number.