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2
1
3
4
C1
V
IN
V
OUT
7
8
6
5
SW
BOOT
GND
DIM
VIN
VCC
RON
CS
C3
R1A
Q1
Q4
L1
R3
LEDs on separate PCB
Optional
R5
Q3
2
CONN-1
C4
V
DIM
C6
JMP-1
U1
External Voltage
Source Optional
4V to 6V
Single package (SC70-6)
Complementary N+P Channel
D1
D2
C2
C5
LM3404
R2
Q3
1
R1B
R4
R6
V
DIM
1N4148
Dual
www.ti.com LM3404 Improved ILED Average and Fast Dimming Demonstration Board
18 LM3404 Improved ILED Average and Fast Dimming Demonstration Board
Figure 17. V
IN
= 9V to 18V, I
LED
= 700 mA, 3 x 3.4V White LED Strings (f
SW
≊≊ 500 kHz)
23
SNVA342E–July 2008–Revised April 2013 AN-1839 LM3402/LM3404 Fast Dimming and True Constant LED Current
Evaluation Board
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