When working with Switch Mode Power Supplies (SMPS), one common challenge is managing high-frequency noise that can affect your circuit’s performance. High-frequency noise often results from the switching action of components like MOSFETs and inductors, which can cause unwanted interference in sensitive electronics. Fortunately, there are simple fixes you can apply to minimize this issue.

The Problem :

Imagine you’re building a power supply for a small motor. The SMPS you’re using is causing electromagnetic interference (EMI) that disturbs nearby circuits, making your motor behave erratically. This happens because high-frequency switching noise isn’t properly filtered out.

The Solution :

To fix this, you can add a high-frequency ceramic capacitor across the input or output of your SMPS. This capacitor will act as a filter, absorbing high-frequency noise and stabilizing your power supply. Additionally, using a low ESR (Equivalent Series Resistance) capacitor will improve the filtering effectiveness.

Sample Calculation :

If your SMPS operates at 12V and supplies 1A, the power consumption is:
Power = Voltage × Current = 12V × 1A = 12 Watts.

Ensure your filtering capacitor can handle high-frequency components with minimal ESR. For instance, a 100nF ceramic capacitor at 25V should be sufficient for filtering.

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