PFC2225BNP-801

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Common Mode Chokes are used to reduce common mode interference in switching power electronic devices, such as switched mode power supplies and AC/DC converters. They are used to reduce conducted noise and provide electromagnetic compatibility in applications with EMC requirements. The PFC2225BNP-801 is an example of a common mode choke, designed to reduce switching noise or ripple, resulting from high frequency switching of switching mode supplies.

The PFC2225BNP-801 is an inexpensive EMI filter that helps to reduce conducted emissions, both AC and DC, generated from powered equipment. It protects sensitive equipment from malfunctioning due to electromagnetic interference (EMI). The PFC2225BNP-801 is designed to be used in SMPSs, AC/DC power supplies with computer peripherals, and other power electronic devices where noise reduction is required.

The PFC2225BNP-801 is composed of a ferrite core and two separate windings, each with an inductance rating of 27.5uH. The windings of the PFC2225BNP-801 are independent, which means that the filter can be used to reduce both AC and DC interference. AC interference is reduced by the inductance of the windings, while DC interference is reduced by the blocking capacitance of the two windings.

In typical applications, both the primary winding and the secondary winding are connected in series with the load of the switching mode power supply (SMPS). When an interfering signal is present, the primary winding draws current from the load and the secondary winding draws current from the input signal, thus, creating a counter-EMI effect. The presence of the PFC2225BNP-801 induces a voltage between the primary and secondary windings, thus reducing the amplitude of the interfering signal.

In addition to reducing common mode interference, the PFC2225BNP-801 also blocks high-frequency signals. By connecting an appropriate capacitor in parallel to the primary and secondary windings of the PFC2225BNP-801, the signal path is interrupted at the frequency determined by the capacitor. This helps to reduce the generation of the conducted emission at high frequencies, thus providing the required levels of electromagnetic compatibility (EMC).

The PFC2225BNP-801 is suitable for applications where basic signal integrity is required, such as half-bridge converters, conventional second-order filter circuits, multi-output power supplies, and power supplies with built-in signal processing functions.

In summary, the PFC2225BNP-801 is a common mode choke designed to reduce common mode interference in switching power electronic devices and provides electromagnetic compatibility in applications with EMC requirements. Its windings are independent, allowing it to reduce both AC and DC interference. It is suitable for applications with basic signal integrity requirements.

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