DC1280A - Schematic

5
4
3
2
1
REVISION HISTORY
ECO
REV
DESCRIPTION
0
1
D
DATE
PROTO
Change Voltage Rating "C1"
08/15/07
D
VIN
L2
15uH
NR4012T150M
Taiyo Yuden
L1
10uH
NR4018T100M
Taiyo Yuden
C1
4.7uF
25V
VOUT2
C10
L3
15uH
NR4012T150M
Taiyo Yuden
1uF
25V
D2
DFLS120-7
D3
(Opt)
E3
VOUT1
12V / 300mA
D1
VOUT1
C6
1uF
16V
E4
GND
VIN
C3
10uF
16V
1206
OUTPUT 1
1
ON
2
JP1
SHDN/SS1
DFLS120-7
R1
54.9K
1%
R2
3
OFF
E5
RSS1
4.7K
C7
100pF
SW1
VIN
6
CSS1
0.33uF
C4
10uF
16V
R3
(Opt)
C8
(Opt)
C9
1uF
E7
VOUT2
-12V / 200mA
E8
GND
C
SW2
FB2N 5
U1
LT3471EDD
7 SHDN/SS2
GND
FBIP
VREF
11
2
3
R4
0 Ohm
R5
FB2P 4
R6
15K
182K
1%
C11
100pF
3
OFF
JP2
SHDN/SS2
8
9 SHDN/SS1
OUTPUT 2
1
ON
2
E9
10
1 FBIN
4.99K
1%
VIN
B
J. Rosales
VIN
E1
VIN
4.5V - 10V
E2
GND
C
APPROVED
0x/xx/07
RSS2
4.7K
B
C2
0.1uF
NOTES: To convert VOUT2 to Positive Output
CSS2
0.33uF
1. Remove R5, C11, L3, C10 and D2.
2. Short out R6.
3. Install D3.
4. Calculate values of R3, R4 and install.
5. Install C8 as needed.
LINEAR TECHNOLOGY CORPORATION
APPROVALS
A
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 customers 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.
5
4
3
1630 McCARTHY BLVD
MILPITAS, CA. 95035
(408)432-1900
(408)434-0507 (FAX)
DRAWN:
ENGINEER:
J. Rosales
A
LTC Confidential For Customer Use Only
DUAL OUTPUT STEP-UP SUPPLIES
APPROVED:
SD
CHECKED:
Date:
www.linear.com
Document Number
Sheet
C:\ORCADWIN\CAPTURE\1280A\1280A_REV1.DSN
Friday, August 17, 2007
2
Rev
Demo Circuit 1280A
1
1
1
of
1
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