DC1225A - Schematic

5
4
3
2
1
D2
PDZ10B
2
1
R6
10k
1
Q2
FZTA42
R1
274K
1%
1
2
3
U1
LTC1871EMS-1
2
ITH
VIN 9
FB
INTVCC 8
3
RC1
12.4K
1%
4
RT
80.6K
1%
3
B
2
1
5
C5
0.1uF
R10
33.2K
50V
1%
C6
0.1uF
R11
18K
BURST
SENSE 10
C3
0.1uF
50V
C4
OPT
GATE 7
FREQ
MODE/SYNC
JP2
MODE
2
Q1
HAT2169H
GND 6
1
GND
E3 VOUT
[email protected]
VOUT
COUT1 33uF
COUT2 16V
COUT3 1812
COUT4
L1B
4.7uH
DRQ127-4R7
4
E2
D1
PDS1040
3
1812
R7
47
CVCC
4.7uF 10V
3
2
1
R9
10K
Q3
BC847BF
RUN
680uF
35V
SANYO
35CE680AX
C
+ CSYS
150uF
16V
E4
2
OPT
1
1812
CDC1
10uF,25V
VIN
5V-20V
+ CIN4
CDC2
10uF,25V
R2
OPT
5
CC2
CC1
R3
R4
6800pF 12.4K 110K
1%
1%
CIN1 22uF
CIN2 25V
CIN3 1812
L1A
4.7uH
DRQ127-4R7
R5
133K
1%
C
E1
VIN
3
OFF
D
GND
1
2
3
ON
2
4
4
JP1
RUN
3
1
JP3
U1 BIAS
3
9V
2
1
VIN
D
R8
0.005
2010
1206
B
CONT.
50V
CUSTOMER NOTICE
NOTE: UNLESS OTHERWISE SPECIFIED
A
1. ALL RESISTORS ARE IN OHMS, 0805.
ALL CAPACITORS ARE IN MICROFARADS, 0805.
CONTRACT NO.
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
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
5
4
3
APPROVALS
DRAWN:
TECHNOLOGY
KIM T.
CHECKED:
TITLE: SCHEMATIC
APPROVED:
ENGINEER: GORAN P.
DESIGNER:
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
SIZE
A
DATE:
A
HIGH EFFICIENCY SEPIC
DWG NO.
DC1225A-1 * LTC1871EMS-1
Thursday, October 18, 2007
2
SHEET
1
REV
A-1
1 OF 1
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