LNK413LG

Voltage - Output:	--
Supplier Device Package:	eSIP-7F
Package / Case:	7-SSIP, 6 Leads, Exposed Pad, Formed Leads
Mounting Type:	Through Hole
Operating Temperature:	-40°C ~ 150°C (TJ)
Applications:	Lighting
Dimming:	PWM
Frequency:	66kHz
Current - Output / Channel:	--
Series:	LinkSwitch®-PH
Voltage - Supply (Max):	725V
Voltage - Supply (Min):	36V
Number of Outputs:	1
Internal Switch(s):	Yes
Topology:	Flyback
Type:	AC DC Offline Switcher
Part Status:	Active
Packaging:	Tube

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Introduction

Linear Technology\'s LNK413LG is a high-voltage, highly integrated Flyback Controller for controlling constant-current LED strings. The LNK413LG offers reliable operation, consistent color and dimming control, and excellent efficiency for LED-based applications. This document provides an overview of the LNK413LG\'s main features, application field, and working principle.

Application Field

The LNK413LG is well-suited to a wide range of LED-based applications, including interior/exterior lighting, backlighting, and decorative lighting. This product is specifically designed to provide LED string control with optimal efficiency, improved reliability, and excellent accuracy.The product is suited to a variety of applications, including:

• Indoor and outdoor lighting
• Backlighting for automotive and other applications
• Retrofitting general illumination fixtures
• Decorative lighting applications

The superior performance of the LNK413LG supports a wide range of applications and the product can be used in high-power applications, including:

• High-beam headlamps
• Interior/exterior lighting
• Retrofits for MR16 or PAR38 bulbs

The product is also capable of providing linear dimming control and is ideal for applications with complex steady-state illumination requirements.

Working Principle

The LNK413LG utilizes a buck-boost circuit to generate a precision current regulated output. In operation, it responds to a pulse-width modulated (PWM) signal from a microcontroller and generates a regulated LED string current of up to 1A (at 25°C ambient temperature) with a 63V output voltage range.The product utilizes a low-dropout (LDO) linear regulator to stabilize the LED string current. The regulator also provides for loop regulation, current-share regulation, voltage-share regulation, and soft-start/stop capabilities. The LNK413LG also offers improved efficiency, with an overall system efficiency of up to 90%.The product also includes a system health monitor that can detect open or short circuit faults and provide an interrupt signal to the microcontroller.

Conclusion

Linear Technology’s LNK413LG is a high-voltage, highly integrated Flyback Controller for controlling constant-current LED strings. The product is suited to a variety of applications, including general lighting, backlighting, decorative lighting, and higher power applications. It utilizes a buck-boost circuit to generate a precision current regulated output and a low-dropout linear regulator for loop regulation, current-share regulation, and voltage-share regulation. The overall system efficiency of the LNK413LG is up to 90%. The product also includes a system health monitor and provides for reliable, consistent dimming control.

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