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User's Guide
SNVA462F–November 2010–Revised May 2013
AN-2097 LM3444 - 230VAC, 8W Isolated Flyback LED
Driver
1 Introduction
This demonstration board highlights the performance of a LM3444 based Flyback LED driver solution that
can be used to power a single LED string consisting of 4 to 10 series connected LEDs from an 180 V
RMS
to 265 V
RMS
, 50 Hz input power supply. The key performance characteristics under typical operating
conditions are summarized in this application note.
This is a four-layer board using the bottom and top layer for component placement. The demonstration
board can be modified to adjust the LED forward current, the number of series connected LEDs that are
driven and the switching frequency. Refer to the LM3444 datasheet for detailed instructions.
A bill of materials is included that describes the parts used on this demonstration board. A schematic and
layout have also been included along with measured performance characteristics.
2 Key Features
• Line injection circuitry enables PFC values greater than 0.98
• Adjustable LED current and switching frequency
• Flicker free operation
3 Applications
• Solid State Lighting
• Industrial and Commercial Lighting
• Residential Lighting
4 Performance Specifications
Based on an LED V
f
= 3.6V
Symbol Parameter Min Typ Max
V
IN
Input voltage 180 V
RMS
230 V
RMS
265 V
RMS
V
OUT
LED string voltage 13 V 21.5 V 36 V
I
LED
LED string average current - 350 mA -
P
OUT
Output power - 7.5 W -
f
sw
Switching frequency - 67 kHz -
PowerWise is a trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
1
SNVA462F–November 2010–Revised May 2013 AN-2097 LM3444 - 230VAC, 8W Isolated Flyback LED Driver
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