LYT4218E2

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The LYT4218E2 is a highly advanced PMIC AC/DC converter, offline switch solution from the experts at Texas Instruments (TI). The solution offers an efficient, ultra-low power, space-saving, and cost-effective alternative to traditional PMIC solutions. With a low quiescent current, high efficiency, and excellent EMI performance, the LYT4218E2 are ideal for applications such as wireless charging, automotive and load/resistor/diode power supply, etc. In order to better understand the operating principles and applications of the LYT4218E2, this article will discuss the working principle and application fields that it is designed for.

Working Principle

The LYT4218E2 is a Switch Mode Power Supply (SMPS) solution that allows an AC or DC power source to be directly connected to the output. The solution supports up to 600V input voltage and up to 1.4A peak load current. At the heart of the solution is an isolated synchronous DC-DC converter which features pulse width modulation (PWM) operation. This allows for a switching frequency of 500kHz, which provides a high power-conversion efficiency and excellent EMI performance.

When the input voltage exceeds the operating conditions of the supply, the internal reset circuit disconnects the input and the output. This protects the system from overtemperature, overvoltage, and overcurrent situations. The output of the LYT4218E2 is regulated by a reference voltage derived from a current-mode control loop. The control loop ensures that the output is maintained at a constant voltage regardless of varying input conditions.

Application Fields

The LYT4218E2 is suitable for a wide range of applications, including wireless charging, automotive, and load/resistor/diode power supply. With its low quiescent current, high efficiency, and excellent EMI performance, the solution provides a cost-effective solution for these applications.

In wireless charging applications, the device provides a constant output voltage to ensure a safe and efficient charging. In automotive systems, the device can provide a reliable and precise power supply for the vehicle\'s onboard electronics. Additionally, the solution is highly suitable for load/resistor/diode power supply, where its high power-conversion efficiency and excellent EMI performance are beneficial.

In addition, the device also provides an integrated LED driver, which can be used in various lighting applications. The LED driver supports multiple current sources, making it suitable for a wide range of LED strings.

Conclusion

The LYT4218E2 from Texas Instruments is an advanced PMIC AC/DC converter, offline switch solution. With its low quiescent current, high efficiency, and excellent EMI performance, the device is suitable for automotive, wireless charging, and load/resistor/diode power supply applications. Additionally, the integrated LED driver supports multiple current sources, making it suitable for a wide range of LED strings. All in all, the device offers customers a cost-effective and reliable solution.

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