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LM25149-Q1EVM-2100: Bode plot quetion

Yian Luo
Prodigy 170 points
Part Number: LM25149-Q1EVM-2100

Tool/software:

Hi team,

I used Bode100 to test frequency response of EVM. Vin=18V, 8A-resistive load, and the phase starts from -10° and reach 80° at cross frequency, which is only 29kHz.

Could you help explain the difference between the test plot and datasheet plot?

Thank you very much.

Best,

Yian Luo

  • 0
    TI__Guru 64365 points

    Hello

    The strange phase plot at very low frequencies is probably an artifact of the internal circuits connected to that node.

    Also, it is difficult to make accurate measurements at such low frequencies.

    You have good bandwidth and phase margin, so your application should be stable.

    Thanks