Datasheet

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Introduction

1 Introduction

This is a two-layer demonstration 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 LM3448 Phase Dimmable Offline LED Driver with Integrated FET Data Sheet (SNOSB51) for

detailed instructions. A schematic and layout have also been included, along with measured performance

characteristics. A bill of materials is also included that describes the parts used on this demonstration

board.

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

• Retrofit TRIAC Dimming

• Solid State Lighting

• Industrial and Commercial Lighting

• Residential Lighting

4 Performance Specifications

Based on an LED V

= 3V

Symbol Parameter Min Typ Max

Input voltage 85 V

RMS

120 V

RMS

135 V

RMS

OUT

LED string voltage 21 V 27 V 33 V

LED

LED string average current - 228 mA -

OUT

Output power - 6.2 W -

Switching frequency - 73 kHz -

SNOA554C–October 2011–Revised May 2013 AN-2090 LM3448 -120VAC, 6W Isolated Flyback LED Driver

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