DC1174A-B - Schematic

A
B
C
D
E
L3
(Opt.)
D25
(Opt.)
T1
PA0808
L1
0.68uH
4
3
3
C67
4.7uF
25V
VA
R4
10
1
+VOUT
4
11
E1
C2
3.3uF
50V
1210
C3
3.3uF
50V
1210
C4
3.3uF
50V
1210
1
5
10
C5
3.3uF
50V
1210
R13
0
1206
9
+Vout
E3
L2
22uH
R79
3.3K
3
4
12V/4.2A
8
1
11
Q27C
2
R94
147
1%
R93
147
1%
A
2
1
3
FS/SYNC
3
MODE
16
SG
VCC
1
11
10
IS+
C10
(Opt.)
R9
(Opt.)
5
9
ITH
4
R69
0
R68
27.4K
C75
47pF
2
R46
619
C79
1.0nF
C76
(Opt.)
C77
10uF
C8
470pF
D6
4.3V
MMSZ4687T1
6
4
1
2
VSB
B
LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY
LINEAR TECHNOLOGY CORPORATION
-VOUT
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
3
Q37
MMBT2907A
FB/PH
R41
11.8K
Q36
MBT3946DW1T1
5
3
R91
10.0K
1
C82
82pF
R66
100K
+VOUT
SS
1
C9
0.22uF
2
2
VCC
SG
VCC
-VOUT
R90
7.50K
R7
47K
Q34
2N7002
-VOUT
Q27
FCX491
VIN
R89
374
1
RUN/SS
C78
4.7nF
1
1
PGND
SS
C30
2.2nF
250V
2
D3
22V
MMSZ5251BS
6
U2
LTC3726EGN
R63
90.9K
3
2
12
PT5
SLP
PT-
IS-
14
SW
PT+
5
C7
(Opt.)
3
1
R56
100
SG
7
8
R61
100
R87
0
R86
261K
15
6
4
13
C73
470pF
D29
PT1N4148WS
2
1
1
C81
10pF
R76
470
1206
VSB
R83
(Opt.)
2
IS
3
-VOUT
VSW
Q27C
-Vout
E4
-VOUT
C71
1uF
1
C6
(Opt.)
4
FS/IN-
6
9
T2
PA0297
C72
0.1uF
GND
C29
33nF
10
7
NDRV
SSFLT
PGND
ULVO
2
R88
47pF
D2
1N4148WS
Q26
FMMT619
2
3
C70
1nF
U1
LTC3725EMSE
FB/IN+
1
VSLMT
1
C24
4.7uF
VCC
2
R22
28.7K
C55
470pF
GATE
3
2
Rb
162K
R18
147K
8
R55
100
1%
R84
0
R58
5.1K
10K
D4
4.7V
MMSZ5230BS
R54
100
1%
R2
86.6
1/4W
1
Ra
Q32
FMMT718
3
2
FG
Q28
FMMT38C
D28
MMSZ5236BS
7.5V
VCC
R85
(Opt.)
R6
10K
CUT
68uF
16V
R50
0.010
1W
C69
150pF
200V
R1
86.6
1/4W
+ C80
C31
(Opt.)
1210
2
R48
.010
1W
C33
22uF
16V
Q12
Si7450DP
R51
86.6
1/4W
2
3
Q6
MMBFJ201
3
Q14
Si7852DP
C1
1.5nF
100V
VA
Q11
(Opt.)
C27
2.2nF
3
R52
86.6
1/4W
C66
1nF
100V
R3
100
VSW
2
1
R49
0
7
1
E2
Q8
Si7852DP
2
1
GND
-Vin
6
8
+Vin
9V-36V
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-B
Date:
Wednesday, August 12, 2009
Sheet
E
1
A
of
1
1
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