User's Guide

SLUU937 – May 2012

LM3447-A19-120VEVM is a Phase-Dimmable, Primary-Side

Regulated LED Driver

1

Introduction

The LM3447-A19-120VEVM is a 10-W, 120-V

for A19/R27 applications.

2

Description

The LM3447-A19-120VEVM is a primary-side power regulated PFC controller used for commercial and

residential phase-cut dimmer compatible LED lamp drivers. The LM3447-A19-120VEVM uses fixed

frequency valley switching operation resulting in discontinuous current operation.

2.1

Typical Applications

•

A19 Bulb Form Factor

•

R27 Bulb Form Factor

2.2

Features

•

Primary-Side Control

•

Leading and Trailing Edge Compatible

•

50:1 Dimming Range

•

Valley Switching

•

Fixed Frequency Discontinuous Operation

•

Thermal Foldback

•

PFC

•

Efficient Triac Hold Current Operation

•

LED Short and Open Circuit Detection

•

Thermal Foldback

•

Constant Power Operation

3

SLUU937 – May 2012

LM3447-A19-120VEVM is a Phase-Dimmable, Primary-Side Regulated LED

Driver

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