DC1073A - Schematic

1
R6
5.1M
R14
(OPT)
R9
R8
16.2K
1%
SYNC
BG 12
6 VC
R7
20K
C7
2200pF
C6
100pF
SENSE+ 10
8 FSET
SENSE- 9
8
7
6
5
8
7
6
5
4
4
1
2
3
Q1
Si7370DP
Q4
Si7370DP
(OPT)
VOUT
VCC
C5
1uF
16V
VOUT
E9
VCC
L1
D8
B120
(OPT)
PGND 11
7 SYNC
R10
49.9K
D1
BAS521
R5 0
VCC 13
5 VFB
(OPT)
143K
1%
SW 14
4 BURST_EN
C12
0
1
2
3
3 SS
VFB
R4
R15 0
4
BG
D3
1N4148WS-7
Q5
Si7370DP
(OPT)
4
Q2
Si7370DP
15uH
R11 0.01
C4
470pF
50V
VOUT
+ COUT1 + COUT2
68uF
68uF
16V
16V
1
6 BURST
1500pF
0.1uF
16V
D2
B160
COUT3
22uF
16V
VOUT
[email protected]
E3
COUT4
1uF
16V
2
5
C3
C2
8
7
6
5
2 CONT .
4 PULSE SKIP
TG 15
2 SHDN
R3
82.5K
R2 0
GND
E4
1
2
3
3
1
BOOST 16
8
7
6
5
VFB
JP2
MODE
1 VIN
100V
1
ON
OFF
0.47uF
LT3845EFE
1
2
3
C1
JP1
RUN
2
U1
2
E8
A
R1
1M
1
VCC
CIN3
2.2uF
100V
E2
3
GND
CIN2
2.2uF
100V
2
CIN1
47uF
63V
1
+
1
GND
VIN
E1
2
VIN
20V - 55V
A
E7
17 SGND
VIN
2
GND
E10
C13
(OPT)
E5
R18
100K
B
B
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
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
1
CONTRACT NO.
APPROVALS
DRAWN
HELEN
DATE
3/08/06
CHECKED
TECHNOLOGY
TITLE
LT3845EFE, High Voltage Synchronous Buck
Controller with Programmable Frequency and Sync
SIZE
CAGE CODE
APPROVED
ENGINEER Kevin Huang
3/08/06
DESIGNER
Tuesday, January 23, 2007
2
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
SCALE:
FILENAME:
DWG NO
REV
A
DC1073A
SHEET
1
OF
2
1
2
A
A
OPTIONAL BIAS CIRCUIT
VCC
VOUT
R13
(OPT)
4
R12
(OPT)
Q3B
Si1555DL
C10
1uF
10V
3
BG
C11 1uF
10V
6
1
Q3A
Si1555DL
2
1
C9
1uF
10V
2
D5
BAV99
3
C8
1uF
10V
1
2VOUT
2
3
3VOUT
5
D4
BAV99
B
B
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
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
1
CONTRACT NO.
APPROVALS
DRAWN
HELEN
DATE
3/08/06
CHECKED
TECHNOLOGY
TITLE
LT3845EFE, High Voltage Synchronous Buck
Controller with Programmable Frequency and Sync
SIZE
CAGE CODE
APPROVED
ENGINEER
Kevin Huang 3/08/06
DESIGNER
Tuesday, January 23, 2007
2
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
SCALE:
FILENAME:
DWG NO
REV
A
DC1073A
SHEET
2
OF
2
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