User's Guide
SNVA407B – August 2009 – Revised May 2013
AN-1993 LM3406HV Evaluation Board with 2 Wire
Dimming
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Introduction
The LM3406HV is a buck regulator controlled current source designed to drive a series string of high
power, high brightness LEDs (HBLEDs) such as the Luxeon™ K2 Emitter at forward currents of up to
1.5A. The converter's output voltage adjusts as needed to maintain a constant current through the LED
array.
Figure 1. Complete Circuit Schematic
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SNVA407B – August 2009 – Revised May 2013
AN-1993 LM3406HV Evaluation Board with 2 Wire Dimming
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