DC923A - Schematic

5
4
3
2
1
REVISION HISTORY
ECO
REV
----
* SEE QUICK START GUIDE
D
VIN
4V-36V
R1
* E3
D5
GND
PWM1
1N4448W
(Opt)
E4
20
3
1N4448W
L1
10uH
Sumida
COUT1
2.2uF
16V
5
6
16
VIN
VIN
SHDN
PWM1
PWM2
BOOST1
BOOST2
VIN
D6
TSSOP20-FE/CB
1N4448W
(Opt)
11
E5
PWM2
D2
8
1N4448W
1
D3
OUT1
OUT2
10
C1
0.22uF
X5R
4
SW1
SW2
7
2
LED1
LED2
9
17
REF
B240A
L2
10uH
Sumida
C2
0.22uF
X5R
COUT2
2.2uF
16V
D4
B240A
Q1
Si2312BDS
(Opt)
REF
R2
0
1206
R6
10k
(Opt)
R8
19
(Opt)
Q2
Si2312BDS
(Opt)
REF
VADJ1
VADJ2
12
VC2
13
VC1
C
R3
0
1206
R5
(Opt)
R4
(Opt)
18
GND
APPROVED
DAVID NG
D
U1
LT3475EFE
20k
CIN1
4.7uF
50V
D1
C
DATE
E1
SHDN
VIN
E2
DESCRIPTION
0
R7
10k
(Opt)
R9
(Opt)
E7
C3
0.1uF
6.3V
R10
(Opt)
GND
RT
GND
15
14
21
R11
(Opt)
C5
(Opt)
C6
(Opt)
R12
24.3k
1%
B
E8
E9
LED1-
LED1+
E6
GND
C4
0.1uF
6.3V
B
E10
LED2+
E11
LED2-
OPTIONAL
EXTENDED DIMMING RANGE
R13
1.0M
(Opt)
C7
A
Q3
2N7002
(Opt)
220pF
(Opt)
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
CONTRACT NO.
APPROVALS
DRAWN:
TITLE:
APPROVED:
ENGINEER: KEITH S.
DESIGNER:
4
3
SIZE
SCHEMATIC
Dual Step-Down 1.5A LED Driver
DWG NO.
A
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
5
TECHNOLOGY
Rudy B
CHECKED:
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
A
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
2
DATE:
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