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LM53603-Q1: Phase Margin

Part Number: LM53603-Q1

Hi All,

TI's recommended phase margin is 45 degrees.
Is my understanding of this correct?
Does this take into consideration variations of external parts, IC and temperature?

The evaluation result at low temperature was less than 45 degrees.
Is it necessary to change the constant of the external device?

Best Regards
Koji Hayashi