ANALYSIS OF THE EFFECT OF PHASE MARGIN ON OUTPUT IMPEDANCE MINIMIZATION OF AN AUTOMOTIVE BUCK CONVERTER
ABSTRACT
Although linear regulators are still seldomly used as post regulators,
power supply designers have shifted to the switch mode power supplies
(SMPS) due to their higher efficiency and minimal size. In the design of
the SMPS, minimization of the output impedance is an important
requirement, and is the function of the compensator [1]. The phase
margin is a key parameter for the compensator design, and is suggested to
be between 45 and 60 degrees [1-2]. The result shows that the output
impedance and the phase margin are inversely related. And therefore, in
designing the compensator for the output impedance minimization, the
phase margin is deliberately selected above 60 degrees.
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