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

R15 C15
FILTER
R2
R7
COFF
R1
R3
D7
Q1
NC
NC
NC
COFF
FILTER
NC
VCC
GND
GATE
ISNS
LM3444
1
2
3
4
5
10
9
8
7
6
V+
C8
V
CC
R22
D8
R12
R14
+
VLED+
VLED±
L1
C6
D2
V+
LINE NEUTRAL
LINE EMI FILTER
Q4
D4
C4
C3
V
CC
COFF
R16
C12
L2
C2
C
OFF
Current Source
C1
L3
C5
R4
C10
C14
RT1
F1
R6
R24
D1
Simplified LM3444 Schematic
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3 Simplified LM3444 Schematic
WARNING
The LM3444 evaluation boards have no isolation or any type of
protection from shock. Caution must be taken when handling
evaluation board. Avoid touching evaluation board, and removing
any cables while evaluation board is operating. Isolating the
evaluation board rather than the oscilloscope is highly
recommended.
WARNING
This LM3444 evaluation PCB is a non-isolated design. The ground
connection on the evaluation board is NOT referenced to earth
ground. If an oscilloscope ground lead is connected to the
evaluation board ground test point for analysis, and AC power is
applied, the fuse (F1) will fail open. The oscilloscope should be
powered via an isolation transformer before an oscilloscope
ground lead is connected to the evaluation board.
2
AN-2083 LM3444 A19 Edison Retrofit Evaluation Board SNVA455C–August 2010–Revised May 2013
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