DER-328: 280mA @ 36V, 90 ~ 132 VAC in


This document is an engineering report describing a non-isolated LED driver (power supply) utilizing a LNK460KG from the LinkSwitch-PL family of devices. The DER-328 provides a single 10 W dimmable constant current output.

The key design goals were high efficiency and small size. This allowed the driver to fit into A19 sized lamps and be as close to a production design as possible.

The board was optimized to operate with U.S. leading-edge TRIAC dimmers over an AC input voltage range of 90 VAC to 132 VAC, 60 Hz. LinkSwitch-PL IC based designs provide a high power factor (>0.95).

The form factor of the board was chosen to meet the requirements for standard A19 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.


Manufacturer Power Integrations
Category Lighting
Sub-Category LED Drivers - AC / Offline
Eval Board -
AC Voltage 115 V
Outputs and Type 1 Non-Isolated
Current Out 280 mA
Voltage Out (Max) 36 V
Efficiency @ Conditions >84%, 106 ~ 132 VACin, 36 V @ 280 mA
>84%, 103 ~ 132 VACin, 33 V @ 280 mA
>84%, 102 ~ 132 VACin, 30 V @ 280 mA
Features Current Limit (Adj. or Fixed)
Dimming Control
Frequency Jitter for EMI
Open Circuit Protection
Over Current Protection
Over Voltage Protection
Short Circuit Protection
Thermal Protection
Switching Frequency 29.6 ~ 122 kHz
Component Count + Extras 33 + 4
Design Author Power Integrations
Application / Target Market LED Commercial Lighting
LED Home Lighting
Voltage In 90 ~ 132 VAC
Power Factor 0.95 @ 115 VAC
Standard(s) IEC 61000-3-2 Class C
Main I.C. Base Part LNK460

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