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TPS53667EVM-769: phase margin at 1000Hz

Jerry Chen
Expert 5110 points
Part Number: TPS53667EVM-769

Hi,

Below is the bode plot of the EVM. The phase marge at 1000Hz is very small. Is this due to DCAP+ mode itself or due to the test instrument?

Thanks.

  • 0
    TI__Expert 4060 points

    Hi Jerry,

    Phase Margin is only defined at the unity gain frequency. Since 1kHz is well within the loop bandwidth of the converter the phase at that point doesn't reflect the stability of the regulator at all. At 100kHz though when the gain crosses 0dB the phase margin is close to 90° showing the converter is definitely stable. The high phase margin at cross over can be attributed to D-CAP+ though which offers better performance than traditional current mode architectures.

    Let me know if you have any other questions.

    Cheers,

    Carmen