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Q&A Using only ceramic capacitors on an input of an SMPS - unclear advice from manufacturer

The electrolytic capacitor acts as a snubber in parallel with the ceramic capacitors. If one were to design an RC snubber to dampen the LC circuit, it would have a large capacitance (compared to t...

posted 6mo ago by Nick Alexeev‭  ·  edited 6mo ago by Nick Alexeev‭

Answer
#2: Post edited by user avatar Nick Alexeev‭ · 2024-06-22T16:53:13Z (6 months ago)
  • The electrolytic capacitor acts as a snubber in parallel with the ceramic capacitors. If one were to design an RC snubber to dampen the LC circuit, it would have a large capacitance (compared to the ceramic), and some series resistance. An electrolytic capacitor can provide both. Its ESR works as the resistance for the snubber.
  • The electrolytic capacitor acts as a snubber in parallel with the ceramic capacitors. If one were to design an RC snubber to dampen the LC circuit, it would have a large capacitance (compared to the ceramic), and some series resistance. An electrolytic capacitor with some ESR is a cheap way to get both. Its ESR works as the resistance for the snubber.
#1: Initial revision by user avatar Nick Alexeev‭ · 2024-06-22T02:45:00Z (6 months ago)
The electrolytic capacitor acts as a snubber in parallel with the ceramic capacitors.  If one were to design an RC snubber to dampen the LC circuit, it would have a large capacitance (compared to the ceramic), and some series resistance.  An electrolytic capacitor can provide both.  Its ESR works as the resistance for the snubber.