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SMPS Low-Ripple Component Selection – A Quick Guide

smps

📉 The Problem :

 

When designing or building an SMPS (Switch Mode Power Supply), high output ripple can cause instability in sensitive electronics like microcontrollers, audio amplifiers, or sensors. Ripple is essentially unwanted AC noise on your DC output, and it’s often caused by poor component choices—especially capacitors and inductors.

 


🛠 The Solution :

 

To reduce ripple, focus on low ESR (Equivalent Series Resistance) capacitors and proper inductor selection. Use electrolytic capacitors with low ESR ratings or better yet, ceramic capacitors in parallel. A well-chosen inductor ensures continuous current mode and filters high-frequency switching noise effectively.

 


💡 Practical Example :

 

Imagine you’re powering an ESP32 Wi-Fi module using a 5V SMPS. If your ripple exceeds 100mV, the Wi-Fi signal may drop. Using a 47µF ceramic capacitor with an ESR of <0.01Ω can help smooth out the voltage.

 


📐 Sample Calculation :

 

Assuming 100kHz switching frequency and 1A load:

To keep ripple <50mV,

C = I / (ΔV × 2πf) = 1 / (0.05 × 2π × 100,000) ≈ 32µF

Use a 47µF ceramic capacitor for margin.

 


🛒 Product Suggestion :

 

Try these India-made components:

 

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