Types of Capacitors Used for Output Smoothing of Switching Regulators and their Precautions Application Note

PublishTime：2021-11-17

●In recent years, it has become a common practice to recommend multilayer ceramic capacitors for the output smoothing of switching regulators due to the stability of their temperature characteristics and the reduction on the mounting area. On the other hand, they are increasingly being replaced by low-cost, high-capacity aluminum electrolytic capacitors and conductive polymer hybrid aluminum electrolytic capacitors. This application note illustrates the use of various capacitors for output smoothing with simulation results of the output voltage ripple and the gain-phase characteristic of the Open loop transfer function frequency response.
●Conclusion
■The frequency and temperature characteristics of the impedance of each type of capacitor are different.
■The output voltage ripple and the gain-phase characteristics of the open loop transfer function frequency response are affected by the frequency characteristics and temperature characteristics of the impedance of the output smoothing capacitor used.
■When aluminum electrolytic capacitors are applied, care must be taken because of the large impedance change with temperature.

Brand of Product：	ROHM
Part#：
Product Category：	Switching Regulators More
Application：	More
Data Type：	Application note & Design Guide More
Safety & Environment Standards：	More
Operating Temperature：	Please see the document for details
Qualification Grade：	More
Qualification Approval：	More
Package：
Language：	English Chinese Chinese and English Japanese
Date of Creation：	2021.10
Version Number：	Rev.001
Data Encoding：	64AN089E
Data Size：	2.2 MB

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