DLP31DN201ML4L Filters

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Common Mode Chokes, usually referred to as CM chokes, are designed to filter or block common mode noise in power systems, such as the DLP31DN201ML4L. CM chokes provide the best performance when placed close to the load, allowing sources of line-conducted EMI to be filtered without the insertion of series resistance. Common mode chokes have several advantages over other noise suppression strategies. For example, they have no impedance variation with frequency, providing uniform suppression over broad bandwidths.

The design of a typical Common Mode Choke consists of two windings around a ferrite core. Although these two windings can be of different formations, they are usually arranged in a symmetrical way around the core. The windings are connected in series with a resistor, allowing current to flow in either direction. This resistor is also referred to as the knee resistor, and is responsible for the choke\'s cutoff frequency. This cutoff frequency is the frequency at which the choke starts to limit the flow of current, and can be adjusted by varying the resistance value of the knee resistor. By varying this resistance, the filter response of the choke can be tailored to meet specific frequency band requirements.

The DLP31DN201ML4L is an example of a common mode choke specifically designed to suppress the common mode noise in DSL and 2-wire telecommunications systems. This choke has a resistance value of 100Ω and inductance value of 1mH, and a cutoff frequency of 100kHz. The galvanic isolation between the two windings provides very good protection against EMI, and the ferrite core of the choke helps reduce the core losses. The choke\'s low capacitance and inductance values also help reduce the electromagnetic interference.

In applications where the common mode noise needs to be further suppressed, the DLP31DN201ML4L can be used in conjunction with a hybrid filter, such as a Buck-boost converter. In such cases, the Buck-boost converter acts like a negative-resistance gain cell, and can achieve a much higher degree of noise suppression. The use of such a hybrid filter can also reduce the overall cost of the system, since it combines the cost of the filter and the choke.

Common Mode Chokes, such as the DLP31DN201ML4L, are versatile noise suppression tools. They provide excellent performance across a wide range of frequencies, with minimal core losses. Furthermore, they are well suited for applications where the common mode noise needs to be further suppressed, such as telecommunications systems. By combining CM chokes with hybrid filters, excellent performance can be achieved at a lower cost.

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