Multi-functionalization, small size, light weight, and energy savings are required of electronic devices. According to these requirements, the expectations of compact/large capacity, low ESR, high reliability, etc. have been increasing, particularly in ceramic capacitors and polymer capacitors.
The demonstration shown in the following is to display and compare the ripple voltage waveform on a personal computer, when replacing an output capacitor of a DC-DC converter from a common electrolytic capacitor type, with a Murata ceramic capacitor or polymer capacitor.
The output capacitor of a DC-DC converter is used to suppress the ripple voltage. When a ceramic capacitor with an extremely low ESR is used, the output voltage may oscillate abnormally. In that case, the abnormal oscillation can be suppressed by tuning the constant of the phase compensation portion.