DC1315A - Schematic

REVISION HISTORY
This circuit is proprietary to Linear Technology and supplied
for use with Linear Technology parts.
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 circuit board layout may significantly
affect circuit performance or reliability. Contact Linear
Applications Engineering for assistance.
ECO
DATE
1
PROTO
08/15/07
APPROVED
R14
R1
VIN
OPT
20k
CIN1
4.7uF
3
4
SW1
SW2
D4
R20
1k 1%
50V
1
PWM1
20
2
E9
B240A
1k 1%
LED1
LED2
3
PWM2
R6
C3
OPT
0.1uF
GND
Q2
OPT
Si2318DS
VC2
12
R9
VC2
18
VC1
E6
UP TO
23V
1.5A
E11
OPT
R8
OPT
LED2-
R5
OPT
R2
0
E10
REF
VADJ2
100k
9
R4
VADJ1
22V
E5
LED2+
19
10k
FMMT3904
11
REF
17
E8
Q1
OPT
Si2318DS
PWM2
OPT
13
LED1-
PWM1
R18
10
REF
UP TO
23V
1.5A
LED1+
OUT2
GND
E7
GND
OUT1
D8
COUT2
2.2uF
50V
B240A
2.2uF
R17
7
D3
R19
COUT1
E4
16
25V
L1 47uH
21
10k
Q5
1
0.22uF
GND
22V
8
C2
1N4448W
9.1V
0.22uF
25V
L2 47uH
15
100k
D6
D2
BOOST2
RT
R16
C1
VC1
D7
1N4448W
BOOST1
14
2
9.1V
R15
6
D1
1
VC2
LT3475EFE-1
SHDN
D5
VIN
VIN
50V
3
MMBT3904
U1
5
VC1
Q4
2
UP TO 36V
E3
GND
DESCRIPTION
E1
SHDN
E2
*
REV
R3
0
C4
R7
0.1uF
OPT
R13
1.0M
OPT
C7
R12
24.3k
600kHz
Q3
OPT
*SEE QUICK START GUIDE
1%
CONTRACT NO.
220pF
OPT
APPROVALS
DRAWN MI
DATE
08/14/07
CHECKED
2N7002
APPROVED
OPTIONAL
EXTENDED DIMMING RANGE
TECHNOLOGY
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
TITLE
SCH, LT3475EFE-1, DUAL STEP-DOWN 1.5A LED DRIVER
ENGINEER
DESIGNER
SIZE
CAGE CODE
DWG NO
REV
1
DC1315A
Tuesday, January 22, 2008
SCALE: NONE
FILENAME: 1315A-1.DSN
SHEET
1
OF
1
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