IP4307CX4/LF,135 Filters

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EMI/RFI Filters (LC, RC Networks): IP4307CX4/LF,135 Application Field and Working Principle

Electromagnetic Interference (EMI)/Radio Frequency Interference (RFI) filters are a crucial component in the modern electrical and electronic system circuit design. They are used to reduce or eliminate interference generated by electromagnetic waves and electrical noise within the circuit. EMI/RFI filters come in various types, the most common of which are LC and RC networks. The IP4307CX4/LF,135 is an example of an LC network type filter from Toshiba. This article will discuss the application field and working principle of the IP4307CX4/LF,135.

The IP4307CX4/LF,135 is a four-line filter with built-in inductors and capacitors. It is designed for applications where the current is required to be filtered in both directions. This filter is capable of blocking common mode and differential mode noise up to 15MHz, with a leakage current of 2.5mA. It has an insertion loss of 0.2dB and an attenuation of 30dB at 15MHz. This makes it suitable for use in power, telecom, consumer, automotive, and other applications where EMI/RFI filtering is required.

To understand the working principle of IP4307CX4/LF,135 requires knowledge of the principles behind LC, or inductor-capacitor, networks. An LC network consists of one or more inductors connected in series with one or more capacitors connected in parallel. The inductors store energy in the form of a magnetic field, while the capacitors store energy in the form of an electric field. When current flows through an LC network, the capacitors allow the current to flow in one direction, while the inductors will prevent the current from flowing in the other direction.

In the case of IP4307CX4/LF,135, the two inductors, L1 and L2, are connected in series between the two lines, while the two capacitors, C1 and C2, are connected in parallel between the two lines. This configuration creates an LC filter that blocks noise in both directions and filters out only frequencies that are necessary. The filter allows current to flow only at specific frequencies, which significantly reduces the electromagnetic interference and radio frequency interference.

The IP4307CX4/LF,135 is a highly effective and efficient EMI/RFI filter. Its low insertion loss, low current leakage, and high attenuation make it suitable for a variety of applications, including power, telecom, consumer, and automotive. The filter’s simple LC configuration also makes it easy to understand and implement in various circuits, making it a great choice for noise reduction.

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