User manual

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1 Introduction
This is a two-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. For detailed instructions, see Triac Dimmable Offline LED Driver
(SNVS570).
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
• Drop-in compatibility with TRIAC dimmers
• Line injection circuitry enables PFC values greater than 0.95
• Adjustable LED current and switching frequency
• Flicker free operation
3 Applications
• Retro-fit TRIAC Dimming
• Solid State Lighting
• Industrial and Commercial Lighting
• Residential Lighting
4 Performance Specifications
Based on an LED V
f
= 3.4V
Symbol Parameter Min Typ Max
V
IN
Input voltage 90 V
RMS
120 V
RMS
135 V
RMS
V
OUT
LED string voltage 13 V 20 V 27 V
I
LED
LED string average current - 365 mA -
P
OUT
Output power - 7.3 W -
f
sw
Switching frequency - 78.5 kHz -
3
SNVA429C–August 2010–Revised May 2013 AN-2034 LM3445 -120VAC, 8W Isolated Flyback LED Driver
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