DER-296: 116mA @ 66V Max, 176 ~ 265VAC in

The document describes a non-isolated high power factor (PF) TRIAC dimmable LED driver designed to drive a nominal LED string voltage of 66 V at 110 mA from an input voltage range of 176 VAC to 265 VAC. The LED driver utilizes the LNK403EG from the LinkSwitch-PH family of ICs.

The topology used is a single-stage non-isolated flyback that meets the stringent space requirements for this design. Enhanced line and load output current regulation requirement is achieved by using a sensing resistance and shunt regulator.

High power factor and low THD is achieved by employing the LinkSwitch-PH IC which also provides a sophisticated range of protection features including auto-restart for open control loop and output short-circuit conditions. Line overvoltage provides extended line fault and surge withstand, output overvoltage protects the supply should the load be disconnected and accurate hysteretic thermal shutdown ensures safe average PCB temperatures under all conditions.

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