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When a Bode plot analysis using an FRA (frequency response analyzer) or the like cannot be performed to examine unwanted oscillations arising due to insufficient phase margins or gain margins, is there a method for identifying positive-feedback oscillations from the oscillation frequency? For example, can it be considered that the switching frequency is an oscillation frequency, or the like.
Oscillations that occur when there are insufficient phase or gain margins are oscillations at frequencies lower than oscillations due to switching frequencies. Whether or not oscillations are occurring can be determined by using an oscilloscope to determine whether or not there are any anomalies (oscillations) in the output voltage or switching waveform.