Since aluminum electrolytic capacitors cannot function well in high frequency bands, they should be supplemented by ceramic or non-inductive film capacitors with good high frequency characteristics. The main advantages are: good high frequency characteristics and low ESR, such as MMK5 type capacitors with a capacity of 1μF The resonance frequency is above 2MHz, the equivalent impedance is less than 0.02Ω, which is much lower than that of electrolytic capacitors, and the smaller the capacity, the higher the resonance frequency (up to 50MHz or more), which will result in a good output frequency response or dynamic response of the power supply.
In filter capacitors, we focus on how to choose filter capacitors in switching power supplies and how to choose filter capacitors in switching power supplies.