
The Problem: SMPS Output Noise
Switched-Mode Power Supplies (SMPS) are efficient, but they often produce output noise—tiny voltage ripples and spikes. These can interfere with sensors, microcontrollers, and audio circuits, leading to unreliable performance.
The Solution: Output Filtering
To suppress noise, you can add LC filters, ceramic capacitors, or ferrite beads at the SMPS output. A typical LC filter uses an inductor in series and a capacitor to ground to smooth out high-frequency noise.
Practical Example: Powering a Microcontroller
Let’s say you’re using a 5V SMPS to power an Arduino. Without filtering, the ripple can cause ADC errors or reset issues. Adding a 10µH inductor and a 100µF capacitor at the output can dramatically improve stability.
Sample Calculation: LC Filter Cutoff
To reduce noise above 10kHz:
L = 10µH, C = 100µF
Cutoff frequency:
f = 1 / (2π√(LC)) ≈ 1.6 kHz
This means most noise above this frequency is filtered out.
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Written by smartxbrains
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