HM28-24011LF

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Common mode chokes are a type of filter used chiefly to contain unwanted electrical noise originating from a variety of sources. They are also used to reduce conducted electromagnetic interference (EMI) and radio frequency interference (RFI). One class of common mode chokes is the high-frequency transformers known as HM28-24011LF application fields and working principles.

HM28-24011LF application field is suitable for the use in all kinds of switching mode power supplies, industrial application, amplitude modulation, frequency modulation, video signal systems and personal computer input-output controller interface circuit, etc. This product is mainly used in 40-50MHz high-speed signal data transmission circuit and power supply filtering circuit, EMI (electro-magnetic interference) suppression application.

The working principle of the HM28-24011LF is based on the magnetic field of the transformer, where the sound signal is transferred across the transformer from one winding to another without the need for electrical contact or power. The transformer is able to couple the signal from one winding to another without the signal coming into contact with the outer shield. The coupling of the signal is achieved through the induction of the flux in the windings. The frequency of this flux depends on the number of turns in the windings, and the core material used. The common mode chokes have an advantage over the use of capacitors in the signal path as they are not subject to lose as much signal with higher frequency signals and can also prevent the spread of high frequency interference.

The HM28-24011LF has a constant impedance characteristic, which is able to reject common noise signals and interference. The common mode chokes have a wide range of inductance values ranging from 35µH to 40µH. This allows them to provide enhanced performance in their respective frequency bands. The circuit model for the HM28-24011LF has a nominal impedance of 1.2 Ohm and an operating frequency of 40MHz to 50MHz.

The HM28-24011LF also has a high-frequency common mode choke coil which is composed of an inner coil and a ferrite core. The ferrite core is used to provide enhanced performance as it helps to increase the inductance of the coil without having to increase the number of turns. This decreases power consumption and also improves the signal to noise ratio. The internal coil of the device is intended for differential mode operation which helps to provide more accurate signal transmission.

The device has a low-profile construction which makes it ideal for use in applications where space is a factor. The pins are lead-free compatible which allows it to be used in various applications and provide enhanced performance when compared to other common mode chokes.

In conclusion, the HM28-24011LF is a versatile common mode choke which is able to provide excellent performance in a wide range of applications, including those involving high speed data transmission and power supply filtering. Its low-profile construction and high-frequency common mode choke coil combination make it an ideal choice for use in space-constrained applications. The constant impedance characteristic ensures that this device is able to reject common noise signals and interference.

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