E-L4981AD

Series:	--
Packaging:	Tube
Part Status:	Obsolete
Mode:	Average Current
Frequency - Switching:	100kHz
Current - Startup:	100µA
Voltage - Supply:	14.5 V ~ 19.5V
Operating Temperature:	-40°C ~ 125°C
Mounting Type:	Surface Mount
Package / Case:	20-SOIC (0.295", 7.50mm Width)
Supplier Device Package:	20-SO
Base Part Number:	L4981A

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E-L4981AD Application Field and Working Principle

Power Factor Correction (PFC) circuits form an important part of the power system in energy-hungry applications. Their main purpose is to improve the power system efficiency and to reduce the transmission losses. The E-L4981AD is a high-powered PFC converter with an integrated pre-regulator for the progressive pre-regulation of the PFC converter output voltage.

Overview

The E-L4981AD is a high-performance synchronous PFC controller. It integrates a control circuit and a built-in MOSFET driver that is capable of driving two MOSFETs in parallel, saving the cost of external components. It offers a high-frequency current sense auto-resonant control with a differential peak current sense comparator and a quasi-resonant current-mode control to minimize current consumption.

Applications

E-L4981AD can be used in a wide range of Power Factor Correction applications. It is ideal for applications such as off-line AC/DC adapters, consumer electronics, and other applications where higher efficiency and power factor correction are desired. Additionally, these devices can provide power supplies with advanced active power factor control, creating a flexible and efficient power supply solution. It is suitable for designs with a MOSFET driven by a high-speed control that requires low consumption.

Features

● Integrated 600V MOSFET works up to 12A● Control chip and external MOSFET driver integrated● Soft start time is adjustable● Single voltage operation from 5.5V to 32V● High power factor correction● High transfer efficiency● High accuracy (threshold: 1.3 V)● Zero-Crossing Light Load operation● Programmable UVLO ● Programmable soft-start● Protection for over-voltage and over-temperature

Working Principle

The working principle of the E-L4981AD is based on a PFC topology with a current-mode control. The design of this type of converter begins with the power analysis, wherein the input and output power (and also the power losses) is analyzed. The power analysis is then followed by a circuit design. The PFC converter utilizes a boost structure in order to get a good power factor correction. In this type of converter, the input and output voltages are different. At the input side, an AC voltage is applied and an inductor is used to filter this AC current and to boost (or step up) the voltage to get a higher voltage at the output. The current sensing circuit, MOSFET drive, and PFC control circuit are used to regulate the current through the inductor and to maintain a constant output voltage. The E-L4981AD provides over-voltage protection by detecting the output voltage of the converter and by automatically shutting the converter down in the event of an over-voltage condition. It also offers over-temperature protection and current-mode control that is used to sense the current through the inductor and to regulate both the switching frequency and the output voltage. In summary, the E-L4981AD is a highly efficient, low cost and low power PFC converter with a high power transfer efficiency and a wide range of features. It is an ideal controller for synchronous PFC designs and offers many advantages such as low noise, low ripple, high current drive and high efficiency.

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