DC617A - Schematic

5
4
P1
+VIN
+VIN
3
R1
10
Q1
Si7456DP
2
4
C3
0.82uF
100V
1812
3
5
D2
MURS120
D1
MURS120
5678
R2
10
2
3
3
VIN
Q4
Si7892DP
D3
BAS21
R6
3.3
250V
2220
1206
8765
C9
1000pF
100V
1206
R4
10
1/4W
1206
R3
10
1/4W
1206
4
321
Q6
Si7892DP
8765
Q7
Si7892DP
C4
8765
4
321
+ 330uF
6.3V
KEMET
7343
4
1
T3
P0926
VS
1
VOUT
C
1
2
5
3
D7
BAT54
3
1 1
D5
BAS21
7V
-VOUT
R45
1.24K
1%
3
1%
C31
1uF
25V
1206
3
R32
470
5
1
8
PGND 14
VDD 1
ISNS 12
1
SG 12
SENSE 11
C29
0.01uF
0805
15 SYNC
R37
3K
R41
10
5VREF
ISO1
MOC207
43 1
7
5
C30
4700pF
8
14 VAUX
C33
0.1uF
50V
0805
R31
1K
R34
1.24K
1%
B
R33
1.47K
1%
VFB 8
TRIM
MARGIN 7
R38
1K
ICOMP 13
C23
0.22uF
VOUT
-VOUT
R48
1.24K
1%
APPROVALS
TECHNOLOGY
DRAWN:
CHECKED:
3. ALL RES. ARE IN OHMS, 0603. ALL CAP. ARE 0603.
ALL DIODES ARE MMBD914BLT1.
ALL NPNs ARE MMBT3904LT1.
ALL PNPs ARE MMBT3906LT1.
APPROVED:
ENGINEER:
DESIGNER:
3
2
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
TITLE:
ISOLATED SYNCHRONOUS FORWARD CONVERTER
SIZE
A
DATE:
4
TRIM
0805
R47
1.24K
1%
NOTES: UNLESS OTHERWISE SPECIFIED
5
R22
100
1/4W
1206
OPTIONAL DIFFERENTIAL SENSE
CONTRACT NO.
2. TO DISABLE OPTIONAL DIFFERENTIAL SENSE:
REMOVE R12, R14, R19-22, U1; ADD R28 = 0 OHM.
-SENSE
R28
OPT
A
1. TO DISABLE OPTIONAL FAST START:
REMOVE C12, D8, D9, R8, R9, R11, R15, Q9, Q11; ADD R25 = 20K.
P5
-SENSE
1%
P6
2
R46
1K
R20
3.01K
OVPIN 9
5 OPTODRV
C22
4700pF
6
C26
3300pF
U2
LTC1698EGN
R35
1K
GND
VFB 9
PGND
10 VC
SS
SGND
4
8
7
SYNC
THERM
NC 16
BG 15
50V
0805
C19
0.022uF
-VIN
3
NC 17
19
C32
82pF
R42
2.43K
1%
D14
BAT54
4
3
VOUT
C21
0.1uF
50V
10 PWRGGD
C28
1000pF
-VIN
R40
10K
R39
52.3K
PULSE ENG.
T2
PA0184
1
4
C17
220pF
3
-
R21
3.01K
1%
C16
1000pF
4
C25
100uF
20V
7343
+
RT1
100K
1206
D12
BAT54
1
R27
1K
R49
OPT
R23
1K
3
C24
0.1uF
50V
0805
C18
3300pF
TG
BSTREF 18
5VREF
R43
10K
U3
LT3781EG
6
5
1 SHDN
5VREF
2 OVLO
FSET
13 VCC
VBST 20
100V
1206
D15
MMBD914
ON/OFF 3
1
C27
0.1uF
50V
0805
C20
0.1uF
D13
BAS21
1
3
+
D11
BAT54
OPT
CG 2
VCOMP 6
VCC
C11
0.1uF
50V
0805
+SENSE
R14
3.01K
1%
1%
ISNSGND 11
FG 16
C15
4.7uF
16V
R26
73.2K
1%
R19
3.01K
3
-VIN
VIN
VCC
U1
LT1783CS5
1
4
R17
10K
P7
+SENSE
7V
5
D8
MMBZ5248B
18V
OPTIONAL FAST START
B
R12
100
1/4W
1206
2
R25
OPT
1206
-VOUT
-VOUT
2
Q10
3 ZVN3310F
C14
330pF
R24
270K
1/4W
1206
6.3V
KEMET
7343
P4
1
1
C12
4.7uF
16V
1210
Q11
MMBT3904
C7
+ 330uF
6.3V
KEMET
7343
VOUT
3
3
R15
47K
C6
+ 330uF
6.3V
KEMET
7343
-VOUT
3
D9
MMBD914
1
3
C5
+ 330uF
321
2
5VREF
ON/OFF
C8
1000pF
100V
1206
6
VCC
P2
Q5
Si7892DP
8765
C10
2200pF
D4
BAS21
R11
62K
1/4W
1206
1
C
L2
1.0mH
D
3
1/4W
1206
8
1
4
2
Q9
FQT7N10LTF
1/4W
1206
2
[email protected]
+VOUT
PA0469
321
-VIN
R9
100
2T
4
2010
R8
100
10T
R5
0.030
VCC
P8
+VOUT
123
-VIN
VOUT
10
1
Q3
Si7456DP
P3
L3
1.45uH
9T
4
1
Q8
MMBT3906
-VIN
VS
6
2
C2
0.82uF
100V
1812
2
C1
0.82uF
100V
1812
T1
PA0463
123
1
1
1
Q2
MMBT3906
D
1
5678
DO1608C-332
COILCRAFT
36V-72V
2
VIN
L1
3.3uH
DWG NO.
REV
DC617A
LT3781EG/LTC1698EGN/LT1783CS5
Thursday, October 17, 2002
SHEET
1
1 OF 1
A
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