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Common Mode Chokes

Common Mode Chokes are components that selectively reduce common mode EMI noise and differential mode EMI noise. This article will discuss the application field and working principle of CM9900-185.

Application Field of CM9900-185

The CM9900-185 common mode choke is designed for applications that require low insertion loss, EMI suppression, and power line filtering. This type of filter can be used in a wide range of applications, from automotive EMI suppression, home appliance EMI suppression, industrial power line filters, and telecommunication equipment EMI suppression. This particular model also has a wide frequency range, making it ideal for applications with broadband needs.

This type of filter is especially suitable when very high EMI suppression performance is required at the 3kHz frequency range. It can also be used in applications where there is limited board space, since the inductance is housed in a 0.125x0.200 inch package.

Working Principle of CM9900-185

The CM9900-185 is a multilayer common mode choke, which consists of a ferrite core surrounded by winding layers. The combined effect of these layers enables effective suppression of both common mode and differential mode EMI noise.

When noise is injected at the primary side of the filter, the combined inductance properties of the choke causes an increased impedance to the signals at the secondary side. As the signal passes through the windings, it generates counter-currents that circulate around the choke, effectively suppressing the noise. As the signal reaches further down the line, the counter-currents dissipate and the induced voltage drops.

The CM9900-185 is designed for high efficiency, with low insertion loss over a wide frequency range. It is also RoHS-compliant, and has excellent temperature stability and durability, making it suitable for applications that require extended operation.

Conclusion

In conclusion, the CM9900-185 is a very effective common mode EMI filter. It is suitable for a wide range of applications, from automotive EMI suppression to industrial power line filtering. The filter is designed for low insertion loss over a wide frequency range, and is RoHS-compliant with excellent temperature stability and durability.

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