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LM53635LQRNLTQ1 gain/phase margin measurement

kura
Genius 4840 points

Our cutomer consider to use LM53635LQRNLTQ1 (5V fix version).

Please let us know how to measure gain/phase margin.

Please let us know which resistor value we should use between VOUT and FB for checking ?

About 50ohms(56ohms) is acceptable ? 

  • 0
    TI__Expert 4100 points

    Hello Kura,

    To measure gain crossover and phase margin you will need to inject AC signal into feedback of the regulator.

    The AC signal is injected through isolation transformer and across small resistor. This resistor is placed between Vout and top resistro in the feedback resistive divider.

    The value you are proposing should work well.

    See attached document.

    If you have any questions or need more information please feel free to contact me.

    Regards

    BraniInjectingAC for phase_gain measurements.docx