CM9900R-155

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Common Mode Chokes (CMCs) are widely used passive components that enable the transmission of signals and decrease interference. They are utilized for the reduction of electromagnetic interference (EMI) in various applications such as telecommunications, power electronics, automotive, and medical. The CM9900R-155 application field and working principle are described in the following sections.

CM9900R-155 Application Field

The CM9900R-155 common mode choke is designed to eliminate both radiated and conducted EMI. Applications of the CM9900R-155 include but are not limited to AC and DC power line applications, automotive EMI filtering, industrial HF power filter systems, consumer medical systems, and telecommunications equipment.

In AC power line applications, they are used to reduce the common-mode and differential-mode noise of power supplies operating in the 10Hz to 10MHz frequency range. They can also reduce EMI noise from AC power lines such as switching power supplies, AC motor drives, and industrial instrumentation. The CM9900R-155 can also be used in DC power line applications to reduce differential-mode noise in the 0 to 100kHz range.

The CM9900R-155 can be used to reduce emission in automotive EMI filtering. It is used for EMI suppressing of engine control, ABS brake control, and airbag system applications. Additionally, it is suitable for industrial HF power filter systems. These systems operate in the 10kHz to 100MHz range. The CM9900R-155 is also used in consumer medical systems to reduce EMI. Medical system applications include portable EEG systems, infusion pumps and MRI systems.

Lastly, telecommunications equipment can also benefit from the EMI suppressing capabilities of the CM9900R-155. They are used in T1/E1/DS1 systems, satellite and cable TV systems, fiber-optic systems, DSL systems and enterprise networks.

CM9900R-155 Working Principle

The working principle of the CM9900R-155 is based on the effects of inductance. This device is composed of two separate coils that are wound in opposite directions around a ferrite core. These coils generate opposing magnetic fields that cancel each other out when a positive current is applied to one of the coils. This is called common-mode current rejection. The CM9900R-155 also has differential-mode noise reduction capabilities. This is done by utilizing the inductance of the two coils to limit the AC signal on the power lines. The effective impedance of the device increases with increasing signal frequency.

The CM9900R-155 is designed with very low DCR (DC resistance) and low core losses. This ensures that the device has a high common-mode attenuation and low signal distortion. The device also has a wide operating temperature range from -45°C to +125°C. This ensures reliable operation in extreme environmental conditions. It is also lead-free and RoHS compliant.

To maximize the performance of the CM9900R-155, it is important to ensure a good mechanical connection between the device and the PCB. This will minimize installation induced effects. It is also important to keep the device away from sensitive components to minimize the risk of EMI induction.

The CM9900R-155 is designed to reduce EMI over a wide frequency range. It is suitable for a variety of applications and has a wide operating temperature range. Its low DCR and low core loss ensure high common-mode attenuation and low signal distortion. To maximize performance, a good mechanical connection and installation away from sensitive components is recommended.

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