DER-261: 300mA @ 12.1V Max, 90 ~ 265VAC in

The document describes a high efficiency LED driver designed to drive 12 V at 0.3 A from an input voltage of 90 to 265 VAC. The LED driver uses the LNK605DG from the LinkSwitch-II family by Power Integrations.

LinkSwitch-II ICs allow the implementation of cost effective and low component count LED drivers meeting the compact design and high efficiency requirements necessary for high temperature operating environments.

The topology used is an isolated flyback operating in discontinuous conduction mode. Output current regulation is sensed entirely from the primary side eliminating the need for secondary side feedback components. No external current sensing is required on the primary side either as this is performed inside the IC further reducing components and losses.

The LNK605DG also provides a sophisticated range of protection features including auto-restart for open control loop and output short-circuit conditions. Accurate hysteretic thermal shutdown ensures safe average PCB temperatures under all conditions.

In LED luminaires the driver determines many of the performance attributes experienced by the end user including startup time and unit to unit consistency.

This document contains the LED driver specification, schematic, PCB diagram, bill of materials, transformer documentation, and typical performance characteristics.