PA3747.105NL

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Common mode chokes, commonly abbreviated as CMCs, are devices commonly used as EMI filtering solutions to protect the electronics of a system or multiple systems from common-mode interference. The CMCs are made of an inductor wound around an iron core with or without an additional capacitor. There are different types of CMCs available, often with technology-specific characteristics to suit a wide range of applications. The CMC is connected between two lines, usually power and signal lines, while providing a high impedance path to common-mode noise without significantly impairing the signal current.

The PA3747.105NL CMC is manufactured by Pulse Electronics and is specifically designed for automotive applications. It is based on the TPU dual-core-series (TPA) construction and designed to filter interference signals generated in automotive applications and other power converters. The winding structure of the core is composed of an 82μH inductance and an integrated resistor of 0.22Ω which provides a low DCR. This configuration makes it suitable for stabilizing power conversion systems.

The working principle of a PA3747.105NL CMC is quite simple. When combined with the capacitor, the choke allows current to flow in one direction only, while blocking current in the opposite direction. As the current passes through the device, it is further filtered to reject common-mode interference. The combination of the inductor and capacitor acts as a low-pass filter, which effectively blocks high frequencies and only allows low frequencies to pass. This reduces the amount of interference that can be induced into power and signal lines.

The PA3747.105NL CMC is designed to provide an effective solution against common-mode interference in automotive applications, power converters, and other power electronics. Its dual-core structure provides a low DCR and allows the device to work effectively in high-temperature environments. Its low-pass filter design effectively filters out common-mode noise and prevents it from reaching the power and signal lines. The device meets the electromagnetic compatibility requirements of the automotive industry, and its wide operating temperature range allows it to work well in high-temperature environments.

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