DC1174A-A - Schematic

A
B
C
D
E
L3
470uH
L1
0.68uH
4
3
3
C67
4.7uF
25V
VA
R4
(Opt.)
1
+VOUT
4
11
10
9
E3
3
4
R54
100
1%
1
R55
100
1%
Q26
FMMT619
2
3
Q27C
R76
470
1206
U2
LTC3726EGN
SS
C78
4.7nF
C30
2.2nF
250V
2
3
FS/SYNC
R66
100K
3
+VOUT
MODE
16
SG
VCC
1
11
10
R41
4.53K
C10
680pF
R9
100
4
ITH
12
PGND
R63
90.9K
VIN
VCC
5
GND
C7
(Opt.)
Q27
FCX491
FB/PH
9
PT-
IS+
14
IS-
PT+
PT5
R61
100
3
1
R56
100
SG
SLP
8
SW
15
6
4
5
FS/IN-
R87
0
R86
261K
2
10
IS
C73
470pF
11
VSLMT
9
R88
47pF
3
1
C6
(Opt.)
-Vout
E4
-VOUT
C71
1uF
13
SSFLT
PGND
ULVO
2
C24
C29
4.7uF 33nF
C72
0.1uF
4
R83
(Opt.)
C70
1nF
T2
PA0297
220uF
6.3V
VSB
R84
0
U1
LTC3725EMSE
FB/IN+
1
R22
28.7K
2
7
NDRV
VCC
6
1
C55
470pF
GATE
3
2
Rb
162K
R18
147K
8
Q32
FMMT718
3
2
R58
5.1K
10K
D4
4.7V
MMSZ5230BS
D28
MMSZ5236BS
7.5V
VCC
R2
28.7
1/4W
1
Ra
C69
470pF
200V
R1
28.7
1/4W
+ C80
C31
(Opt.)
1210
R50
0.004
1W
VA
R51
28.7
1/4W
R48
.010
1W
C33
100uF
6.3V
Q12
Si7852DP
FG
Q28
FMMT38C
C1
1nF
100V
R85
(Opt.)
R6
10K
CUT
R52
28.7
1/4W
Q14
HA2169H
2
3
Q6
MMBFJ201
3
2
Q11
(Opt.)
C27
2.2nF
3
VSW
7
C66
3.3nF
100V
R3
100
5V/10A
1
R49
0
L2
4.3uH
R79
1.0K
8
E2
+Vout
2
R13
(Opt.)
1206
1
C5
3.3uF
50V
1210
7
C4
3.3uF
50V
1210
RUN/SS
C3
3.3uF
50V
1210
6
C2
3.3uF
50V
1210
1
5
1
E1
Q8
Si7852DP
2
D1
BAS21
1
GND
-Vin
VIN
8
+Vin
9V-36V
D25
BAS21
T1
PA0801.005
6
R69
0
C75
47pF
2
R46
619
R68
12.1K
C79
1.0nF
C76
(Opt.)
C77
10uF
-VOUT
-VOUT
D29
PT1N4148WS
Q27C
R89
158
2
C9
0.22uF
-VOUT
R94
147
1%
SG
R93
147
1%
2
A
VSB
B
LINEAR TECHNOLOGY CORPORATION
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.
R92
47K
-VOUT
3
Q37
MMBT2907A
LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY
-VOUT
1
C82
75pF
Q36
MBT3946DW1T1
5
C8
470pF
D6
4.3V
MMSZ4687T1
6
R91
10.0K
1
VCC
Q34
2N7002
2
2
1
1
SS
1
R7
47K
2
D3
12V
MMSZ5242BS
R90
7.50K
1
3
2
4
C81
10pF
2
1
1
VSW
3
D2
1N4148WS
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-A
Date:
Friday, August 14, 2009
Sheet
E
1
A
of
1
1
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