What is the harm of ripple in high frequency switching circuit? Take buck circuit as an example. What harm will there be when the inductance is too small and the current ripple is very large? I hope to describe it in detail. Generally speaking, there are two kinds of ripple, one is ripple and the other is noise, which are different.

Ripple is an AC component existing in DC voltage, which is generally caused by unclean filtering. Noise is a high-frequency AC component at the output except ripple, which is related to the switching frequency of the control circuit.

The biggest harm of large ripple to the development of power supply is to reduce efficiency and cause interference in the later stage.

For a detailed discussion of ripple, please refer to the attached page.

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