DER-359: 230mA @ Up to 39V, 90 ~ 132 VACin

This document is an engineering report describing a non-isolated buck LED driver (power supply) utilizing a LYT4312E from the LYTSwitch-4 family of devices.

The DER-359 provides a single 8 W dimmable constant current output.

The key design goals were high efficiency to maximize efficacy and small size. This allowed the driver to fit into BR30 sized lamps and be as close to a production design as possible.

The board was optimized to operate across a low line AC input voltage range (90 VAC to 132 VAC, 47 Hz to 63 Hz). LYTSwitch-4 IC based designs provide high power factor (>0.97) easily meeting international requirements.

The form factor of the board was chosen to meet the requirements for standard BR30 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 document contains the power supply specification, schematic, bill of materials, transformer documentation, printed circuit layout, design spreadsheet and performance data.