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For DC/DC converters, a phase margin of 45 degrees or greater, and a gain margin of -10 dB or lower, are used as standard values. Why are these values used?
These values are used because they balance appropriate response speed and stability. If the phase margin and gain margin are inadequate, ringing or other unstable waveforms appear as load transient response waveforms. And, if too much emphasis is placed on stability in a design with reduced bandwidth, response is worsened and the load transient response characteristics are adversely affected.