DC1174A-C - Schematic

A
B
C
D
E
L3
(Opt.)
D25
(Opt.)
T1
PA0810
L1
0.68uH
4
6
3
10
R4
10
1/4W
1
+VOUT
4
9
E3
3
4
8
1
R54
100
1%
R94
147
1%
R93
147
1%
2
A
2
3
3
MODE
16
VCC
1
SG
FS/SYNC
ITH
R68
27.4K
C75
47pF
2
R46
619
C79
470pF
C76
(Opt.)
C77
10uF
1
3
2
-VOUT
LINEAR TECHNOLOGY CORPORATION
Customer Notice
R92
47K
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.
-VOUT
VSB
B
Q36
MBT3946DW1T1
5
3
Q37
MMBT2907A
R69
113K
1
R91
10.0K
C8
470pF
D6
4.3V
MMSZ4687T1
1
C82
75pF
R9
(Opt.)
4
LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY
C9
0.22uF
2
2
VCC
SG
R66
100K
C10
(Opt.)
SS
6
R90
7.50K
R7
47K
Q34
2N7002
-VOUT
FB/PH
R41
14.7K
-VOUT
4
1
1
11
10
Q27C
R89
511
1
10
C78
4.7nF
2
D3
22V
MMSZ5251B
12
SS
+VOUT
VIN
3
2
PGND
R63
90.9K
C30
2.2nF
250V
D29
PT1N4148WS
2
1
1
VCC
5
U2
LTC3726EGN
IS+
PT-
13
C7
(Opt.)
Q27
FCX491
SG
IS-
14
SW
2
PT+
PT5
R61
100
3
1
R56
100
9
8
FG
15
6
4
GND
PGND
6
9
2
3
-VOUT
C81
10pF
R76
680
1206
VSB
R83
(Opt.)
5
FS/IN-
R87
0
R86
261K
R88
47pF
C73
470pF
GND
SSFLT
28.7K
VSW
Q27C
-Vout
E4
-VOUT
C71
1uF
1
C6
(Opt.)
4
11
ULVO
2
R22
C72
0.1uF
FB/IN+
1
C24
C29
4.7uF 33nF
D2
1N4148WS
R55
100
1%
Q26
FMMT619
2
3
C70
1nF
T2
PA0297
47uF
20V
1
Q32
FMMT718
3
2
R84
0
U1
LTC3725EMSE
IS
7
NDRV
VCC
VSLMT
1
C55
470pF
GATE
3
2
Rb
162K
8
D28
MMSZ5236BS
7.5V
VCC
R2
196
1/4W
10K
R18
147K
D4
4.7V
MMSZ5230BS
C69
100pF
200V
R58
5.1K
+ C80
C31
(Opt.)
1210
R50
0.012
1W
VA
R1
196
1/4W
C33
22uF
16V
Q12
Si7450DP
R51
196
1/4W
R48
.010
1W
1
Ra
C1
390pF
200V
2
3
Q28
FMMT38C
Q14
Si7456DP
R85
(Opt.)
R6
10K
CUT
1/4W
Q11
(Opt.)
C27
2.2nF
Q6
MMBFJ201
3
2
C66
2.2nF
100V
R3
100
3
VSW
7
R52
196
R49
0
15V/3.3A
2
E2
+Vout
L2
12uH
R79
3.3K
1
R13
0
1206
1
C5
3.3uF
50V
1210
SLP
C4
3.3uF
50V
1210
7
C3
3.3uF
50V
1210
RUN/SS
C2
3.3uF
50V
1210
Q8
Si7852DP
2
3
1
5
6
9V-36V
-Vin
1
C67
4.7uF
25V
VA
11
E1
8
+Vin
VIN
D1
(Opt.)
C
D
1630 McCARTHY BLVD.
MILPITAS, CA. 95035
408-432-1900
408-434-0507 FAX
Title
LTC3725EMSE, LTC3726EGN 9V-36Vin Forward Converter
Size
Document Number
Rev
Demo Circuit 1174A-C
Date:
Wednesday, August 12, 2009
Sheet
E
1
A
of
1
1
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