LM3444-230VAC NSC [National Semiconductor], LM3444-230VAC Datasheet

LM3444-230VAC

Manufacturer Part Number

LM3444-230VAC

Description

8W Isolated Flyback LED Driver Industrial and Commercial Lighting

Manufacturer

NSC [National Semiconductor]

Datasheet

1.LM3444-230VAC.pdf (18 pages)

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LM3444 - 230VAC, 8W

Isolated Flyback LED Driver

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 con-

nected LEDs from an 180 V

power supply. The key performance characteristics under

typical operating conditions are summarized in this applica-

tion 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 se-

ries connected LEDs that are driven and the switching fre-

quency. Refer to the LM3444 datasheet for detailed instruc-

tions.

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 character-

istics.

Performance Specifications

Based on an LED V

Symbol

LED

OUT

LED string average current

= 3.6V

Switching frequency

LED string voltage

Output power

Input voltage

Parameter

RMS

to 265 V

301397

RMS

, 50 Hz input

Demo Board

180 V

13 V

Min

RMS

National Semiconductor

Application Note 2097

Clinton Jensen

May 3, 2011

Key Features

•

Applications

•

Line injection circuitry enables PFC values greater than

0.98

Adjustable LED current and switching frequency

Flicker free operation

Solid State Lighting

Industrial and Commercial Lighting

Residential Lighting

230 V

350 mA

67 kHz

21.5 V

7.5 W

Typ

RMS

30139704

265 V

36 V

Max

www.national.com

RMS

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