LYT4315E2

Duty Cycle:	99.9%
Mounting Type:	Through Hole
Supplier Device Package:	eSIP-7C
Package / Case:	7-SSIP, 6 Leads, Exposed Pad, Formed Leads
Operating Temperature:	-40°C ~ 150°C (TJ)
Control Features:	--
Fault Protection:	--
Power (Watts):	25W
Frequency - Switching:	140kHz
Series:	LYTSwitch™-4
Voltage - Supply (Vcc/Vdd):	--
Topology:	Flyback, Step-Down (Buck), Step-Up (Boost)
Voltage - Breakdown:	725V
Internal Switch(s):	Yes
Output Isolation:	Isolated
Part Status:	Active
Packaging:	Tube

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Introduction

PMIC (Power Management ICs) are electronic components that manage the power supply and consumption of digital devices. In PMIC’s, AC-DC converters, offline switchers, and DC-DC converters are the three primary categories. The LYT4315E2 is an AC-DC converter and offline switcher, which is used to provide a good quality and low cost single stage solution for low power AC-DC applications. It works by using a quasi-resonant topology to achieve improved energy efficiency and maximum power density of the power supply. This article will discuss the application fields and working principle of the LYT4315E2 AC-DC converter and offline switcher.

Application Field

The LYT4315E2 is an AC-DC converter and offline switcher that is suitable for low power AC-DC applications, as it combines both converter and offline switcher functionality in one package. It is used in a wide range of applications that require a reliable, efficient, and low-cost power supply, such as industrial and home appliance equipment, office automation equipment, consumer electronics, and automotive interior lighting.The LYT4315E2 is a single-stage solution and includes an integrated half-bridge converter, along with short-circuit and over-temperature protections. It also offers low standby power consumption and high power conversion efficiency, which is suitable for edge-location remote powering applications. Additionally, it has an ultra-low Leakage Current of less than 5μA, which further reduces the system cost and enhances the end-product reliability.

Working Principle

The LYT4315E2 is based on a quasi-resonant topology, which can be used for both AC-DC and DC-DC power conversion. In a quasi-resonant converter, the switching frequency is varied with regard to the output voltage in order to achieve improved energy efficiency and reduced switching loss during operation.The LYT4315E2 uses the PWM (Pulse Width Modulation) control method to regulate output voltage. It features a high-efficiency, low-loss current-mode control. The operation of the PWM control is based on the comparison of the input voltage and the reference voltage. If the input voltage is greater than the reference voltage, the output voltage is greater than the reference voltage, indicating that the load is consuming power. The PWM control then reduces the duty cycle of the switching frequency in order to reduce the output voltage and meet the reference voltage.The LYT4315E2 also has a soft start feature, which is an important part of the power supply circuit. This feature avoids large inrush currents during the power-up stage, which can occur when the power supply suddenly starts running. The soft start also prevents over-voltage and over-current hazards, making it an essential part of the power supply system.< h2>ConclusionThe LYT4315E2 is an AC-DC converter and offline switcher that combines the best features of both converters and switchers into one package. It offers high efficiency and improved energy efficiency. The PWM control, soft start feature, and low standby power consumption make it a great choice for use in low power AC-DC applications. Lastly, its ultra-low leakage current ensures the system cost is kept low and the end-product reliability is high.

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