LYT4223E3

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LYT4223E3 is a PMIC (Power Management Integrated Circuit) from the family of AC DC Converters, Offline Switchers. Understanding its application field and working principle is essential to get an idea about the capabilities of the chip. This article explains the working principle and highlights its potential application field.

LYT4223E3 Working Principle:

The main function of LYT4223E3 is to convert a rectified AC input and provide a constant regulated output. In general, the chip comprises a full-bridge rectifier, a synchronous rectifier, a regulator boost stage, a voltage regulator and some other peripheral circuits such as error amplifier and over-temperature protection.

The chip starts its operation from the full-bridge rectifier comprised of four switches connected in a bridge configuration. The AC input is rectified and the resultant direct current is filtered and delivered to the boost regulator stage. The purpose of this stage is to increase the voltage level above the source AC voltage to acquire sufficient power for the subsequent stage. The boosted input is further governed by the synchronous rectifier and limited to the desired output voltage through the voltage regulator.

As for the regulation, the chip features voltage control mode and current control mode for various applications. Moreover, it offers several protection features including over-voltage protection (OVP), under-voltage protection (UVP), over-current protection (OCP), and temperature protection. Finally, it is equipped with an internal loop amplifier that can help to improve the transient performance.

LYT4223E3 Application field:

As an offline high frequency transformer-based AC/DC switching power supply, the LYT4223E3 integrated circuit can be used in a variety of applications including home appliances, consumer electronics, medical equipment, and industrial automation. Its ability to control the output voltage and current makes it suitable for the needs of various applications.

The non-isolated flyback based design incorporating this chip is suitable for applications from 10W to 50W. Owing to its wide operational temperature range and good power conversion efficiency, its application field is continuously extending. Further, its flexibility to operate from a wide range of input AC voltages from 90Vac to 270Vac allows the chip to be deployed in multiple regions.

In various industrial automation applications, the switching power supply provides a stable, constant output voltage for the operation of industrial motors, pumps and other associated equipment. Major applications based on the LYT4223E3 include AC/DC adaptors, CCTV Cameras, Set-top boxes, and LED Lighting. The chip is suitable for low power applications, ranging from 20W to 50W.

To sum up, the LYT4223E3 is an advanced Power Management Integrated Circuit from the family of AC DC Converters, Offline Switchers. It offers high power conversion efficiency, over-temperature protection and wide operational temperature range which make it suitable for applications ranging from consumer electronics, home appliances, medical equipment, to industrial automation.

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