Texas Instruments LM3405A, Руководство пользователя, Страница: 10 / 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
GND
LED
ANODE
LED
CATHODE
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
GND
LED ANODE
LED
CATHODE
* a zener diode is connected in R3 spot
Additional Circuit Configuration Schematics
www.ti.com
Figure 16. V
BOOST
Derived from V
IN
through a Series Zener Diode
Figure 17. V
BOOST
Derived from V
OUT
through a Series Zener Diode
10 AN-1685 LM3405A Demo Board SNVA271B – October 2007 – Revised April 2013
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