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Optimizing Power Supply Output with Ceramic and Electrolytic Capacitors


Uncover the secrets of combining ceramic and electrolytic capacitors to achieve the best damping, bulk capacitance, and minimal output ripple in your power supply. Join us as we dive into the fascinating world of capacitor optimization.

Understanding Capacitor Functions

Capacitors play a crucial role in filtering the switching ripple and controlling the power supply output. They ensure stable voltage and minimize noise, making them indispensable in power supply design. But how can we optimize their performance?

Importance of Balanced Capacitance

Balancing ceramic and electrolytic capacitors is key to achieving damping at crossover frequency and minimizing ripple at switching frequency. The right combination ensures sufficient bulk capacitance for sudden load changes while effectively reducing impedance.

Analyzing Capacitor Behavior

The behavior of capacitors with frequency is intriguing. The ESR remains relatively constant from 1kHz to 10MHz, making the choice of capacitors crucial for reducing switching ripple. Let's delve deeper into this fascinating phenomenon.

Comparing Ceramic and Electrolytic Capacitors

Ceramic capacitors excel up to around 25MHz but become inductive afterwards, while electrolytic capacitors offer lower ESR at low frequencies. Understanding these differences is essential for optimizing power supply performance.

Optimizing Capacitor Combination

By combining ceramic and electrolytic capacitors, we can achieve improved ESR values for loop design at various switching frequencies. This optimized combination provides bulk capacitance for low frequencies and minimizes output ripple at high frequencies, resulting in an ideal power supply output.


Unlock the potential of your power supply output by mastering the art of capacitor combination. Achieve stability, minimal ripple, and efficient voltage regulation with the right mix of ceramic and electrolytic capacitors.

For a simpler understanding, check out a video demonstration below.

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