Texas Instruments LM3405A, User Manual, Page: 2 / 11

LM3405A
V
IN
V
IN
EN/DIM
BOOST
SW
FB
GND
C3
D1
D2
D3 C4
R3
C1
PWM
L1
C2
R1
C5
V
OUT
1
2
3
4
5
6
P1
7
12
6
1
R2
FB
2
3
4
5
D4 *
* Not installed
GND
ANODE of
First LED
CATHODE of
Last LED
I
F
PWM Dimming
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Figure 1. LM3405A Demo Board Schematic
Figure 2. PWM Dimming of LEDs Figure .
2 AN-1685 LM3405A Demo Board SNVA271B – October 2007 – Revised April 2013
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