DER-278: 500mA @ 33V Max, 90 ~ 265VAC in

This document describes an isolated, power factor corrected, very high efficiency LED driver designed to drive an LED string of 30 V at a current of 500 mA (both nominal) from an input voltage range of 90 to 265 VAC.

The LED driver uses a LNK407EG device from the LinkSwitch-PH family of ICs. This integrated controller and 725 V MOSFET dramatically reduces the complexity and component count of the solution.

The key design goals were to achieve the highest possible efficiency and eliminate electrolytic capacitors. Both are key factors for increasing the lifetime and reliability of LED drivers making this solution ideal for industrial and commercial applications.

This document contains the LED driver specification, schematic, bill of material, transformer documentation and typical performance characteristics. The design was based on the reference design board RD-194 with simple component changes to meet the new specification.