Datasheet
Table Of Contents
- AN-2083 LM3444 A19 Edison Retrofit Evaluation Board
- 1 Introduction
- 2 Evaluation Board Operating Conditions
- 3 Simplified LM3444 Schematic
- 4 Pin-Out
- 5 LM3444 Evaluation Board Schematic
- 6 Bill of Materials LM3444 Evaluation Board
- 7 Output Current versus Number of LEDs for Various Modifications
- 8 Typical Performance Characteristics
- 9 PCB Layout
- 10 EMI/EMC Information
Output Current versus Number of LEDs for Various Modifications
www.ti.com
7 Output Current versus Number of LEDs for Various Modifications
# of Output Current (mA) Output Current (mA) Output Current (mA) Output Current (mA)
LEDs Original Circuit Modification A
(1)
Modification B
(2)
Modification C
(3)
2 520
3 500
4 475
5 340 248 265 455
6 315 235 250 432
7 300 222 237 412
8 275 210 224
9 260 200 212
10 245 190 200
11 230 180 190
12 215 170 180
13 205 164 170
14
(4)
196 156 162
15
(4)
190 150 155
16
(4)
183 142 148
17
(4)
175 135 142
18
(4)
170 130 137
(1)
Modification A: R14 = 2.37Ω, R16 = 150kΩ, C3 = 330µF, 63V.
(2)
Modification B: R14 = 2.2Ω, R16 = 165kΩ.
(3)
Modification C: R14 = 1.2Ω, R16 = 137kΩ, L3 = 470µH, C3 = 1000µF, 25V.
(4)
For all applications using greater than 13 LEDs a 330µF, 63V output capacitor (C3) was used.
6
AN-2083 LM3444 A19 Edison Retrofit Evaluation Board SNVA455C–August 2010–Revised May 2013
Submit Documentation Feedback
Copyright © 2010–2013, Texas Instruments Incorporated