DER-304: 93mA @ 48V Max, 190 ~ 265VAC in

This document is an engineering report describing a non-isolated LED driver (power supply) utilizing a LNK458KG from the LinkSwitch-PL family of devices. The driver provides a single constant current output with an output power of 4.5 W.

The key design goals were high efficiency and small size, enabling the driver to fit into candelabra and B10 sized lamps.

The board was optimized to operate over the high AC input voltage range (190 VAC to 265 VAC, 47 Hz to 63 Hz). LinkSwitch-PL based designs provide a high power factor (>0.9) meeting current international requirements.

The form factor of the board was chosen to meet the requirements for standard B10 LED replacement lamps. The output is non-isolated and requires the mechanical design of the enclosure to isolate the output of the supply and the LED load from the user.

The design was not optimized for operation with phase controlled (TRIAC) dimmers but this is possible with some modification. For an example of a dimmable version please visit http://www.powerint.com/en/applications/led-lighting.

The document contains the power supply specification, schematic, bill of materials, transformer documentation, printed circuit layout, design spreadsheet and performance data.