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The low ESR is a feature of the MLCC, but it is so much lower compared to an aluminum electrolytic capacitor that on the contrary, the output voltage of the DC-DC converter becomes unstable and causes oscillations to occur. As shown here in the figure, the DC-DC converter compares the output voltage with the reference voltage, amplifies the error amount with the error amp (error amplifier), and performs negative feedback to achieve a constant and stable direct current voltage. However, signal phase lag occurs due to the inductor (L) and the capacitor (C) of the smoothing circuit. As the phase lag approaches 180°, a positive feedback condition is created, causing it to become unstable and oscillate.
PTM Published on: 2015-09-10
