LK21253R9K-T

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Fixed inductors are components used mainly in analog circuits used to store electrical energy in a magnetic field. In particular, they are used to provide a current or voltage stimulus or feedback and to filter out unwanted frequency components from a signal. The LK21253R9K-T is an SMD Leaded Inductor manufactured by Power Integrations, typically used in power factor correction applications.

The most common application for this device is in power factor correction (PFC) circuits. A PFC circuit is designed to control the flow of power into an electrical load. The LK21253R9K-T provides an inductor with low series resistance and high inductance, allowing the PFC circuit to regulate the voltage or current level desired for the load. In this way, the PFC works to reduce the amount of Total Harmonic Distortion (THD) present in the system.

The LK21253R9K-T is also used in data and communication equipment, particularly broadband and high-frequency systems, due to its small parasitic capacitance, which ensures a low signal attenuation. In addition, its resonant frequency is also a factor for consideration when implementing a high frequency circuitry.

The LK21253R9K-T has a rated current rating of 3A and is rated for an operating temperature range of -40°C to +130°C. The device has an inductance value of 62 nH and is available in an 8-pin package (L-C-L). Its ESR value is 19 mΩ at 100 kHz and its self-resonant frequency is 6.3 MHz.

The working principle of the LK21253R9K-T is based on Faraday\'s law of induction. The device acts as a closed looped magnetic core, which allows it to store energy in the magnetic field generated by the current flowing through it. The inductor\'s magnetic field restricts the flow of current by creating a change in voltage, and as a result, creates a stepped voltage or current. This is what allows the device to be used for power factor correction and high frequency signal processing.

In conclusion, the LK21253R9K-T is a fixed inductor designed for PFC and high frequency signal processing applications. It has a low series resistance and high inductance value, and features a rated current rating of 3A, ESR value of 19 mΩ at 100 kHz, and self-resonant frequency of 6.3 MHz. Its working principle is based on Faraday\'s law of induction, which allows the device to generate a voltage or current step when an electrical current is passed through it.

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