DER-092: 40mA @ 13V Max, 0.5W, 85 ~ 265VAC in


This document is an engineering report describing a 0.5 W constant current LED driver power supply utilizing a LNK302P. This power supply is intended as a LED driver that can be used in emergence exit signs and neon light replacements.

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

LinkSwitch-TN is specifically designed to replace all linear and capacitor-fed (cap dropper) non-isolated power supplies in the under 360 mA output current range at equal system cost while offering much higher performance and energy efficiency.

LinkSwitch-TN devices integrate a 700 V power MOSFET, oscillator, simple On/Off control scheme, a high-voltage switched current source, frequency jittering, cycle-by-cycle current limit and thermal shutdown circuitry onto a monolithic IC. The start-up and operating power are derived directly from the voltage on the DRAIN pin, eliminating the need for a bias supply and associated circuitry in buck or flyback converters. The fully integrated auto-restart circuit in the LNK304-306 safely limits output power during fault conditions such as short-circuit or open loop, reducing component count and system-level load protection cost. A local supply provided by the IC allows use of a non-safety graded optocoupler acting as a level shifter to further enhance line and load regulation performance in buck and buck-boost converters, if required.


Manufacturer Power Integrations
Category Lighting
Sub-Category LED Drivers - AC / Offline
Eval Board -
AC Voltage 115 V
230 V
Outputs and Type 1 Non-Isolated
Current Out 40 mA
Voltage Out (Max) 13 V
Efficiency @ Conditions >76%, 90 ~ 245 VAC in @ Full Load
Features Current Limit (Adj. or Fixed)
Open Circuit Protection
Short Circuit Protection
Thermal Protection
Switching Frequency 66 kHz
Component Count + Extras 9 + 2
Design Author Power Integrations
Application / Target Market LED Commercial Lighting
LED Home Lighting
Voltage In 85 ~ 265 VAC
Power Factor
Main I.C. Base Part LNK302

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