LNK415EG

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The LNK415EG is an integrated circuit (IC) from Power Integrations which includes features geared towards power distribution and control. This versatile IC can be used in a range of applications, primarily in the field of LED Drivers. This article will discuss the field of application as well as the working principle of the LNK415EG.

Application Field

The LNK415EG is a high-performance precision current controller for off-line LED drivers. It is an ideal IC for LED Driver applications because it has a low minimal current of 250 mA and a wide linear regulation range of 1 mA to 7 A. The LNK415EG also features low component count, high efficiency, and ruggedness, making it well-suited for a variety of applications, including fixtures, signs, street lighting, troffers, downlights, and pathway lighting. The IC has been designed to provide superior performance in low-cost, isolated and non-isolated LED Driver applications. Additionally, it offers a wide range of control options, including a pulse width modulation (PWM) control method and a programmable current output.

The LNK415EG radiation tolerant to 10krad, making it suitable for spaceflight applications. It is also extremely reliable, featuring long MTBF time of 3,000 hrs and over-temperature protection. The current sensing functionality is also provided, with an integrated current sensor providing accurate information about the current output. Additionally, a compensation loop has been included to ensure dynamic voltage stability. The device also features an integrated thermal shutdown for system protection.

Working Principle

The LNK415EG works by distributing the input power from the power supply to the outputs. A PWM control architecture has been included to regulate the power and current output. This control architecture takes a DC voltage from the power supply that is converted to a PWM signal by an internal error amplifier. This PWM signal is then sent to the switching converter, which controls the power and current output.

The LNK415EG also features a programmable current output. This feature can be used to adjust the amount of current sent to the LED Driver, as well as the power delivered to the LED. The output current can be adjusted via a programming pin on the device and is then sensed by an internal current sensor. The sensed current is then used to regulate the output.

In addition to these features, the LNK415EG also includes several protection features to ensure reliability and performance. These include over-voltage protection (OVP), over-current protection (OCP) and thermal shutdown. The OVP feature protects the device from too high a voltage, while the OCP feature protects from too high a current. The thermal shutdown feature protects the device from overheating, which could cause damage to the IC. The protection features of the LNK415EG are programmable, allowing for an adjustable current output.

Overall, the LNK415EG is an ideal IC for LED Driver applications. It features a wide regulation range and low minimal current, as well as robust protection features such as OVP, OCP, and thermal shutdown. The programmable current output and current sensing capabilities make the device suitable for a variety of applications. Lastly, the radiation tolerance makes the device suitable for spaceflight applications.

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