DC479A - Schematic

5
4
3
2
1
VIN
L1
3.3uH
P1
+VIN
+VIN
36V-72V
KEYSTONE 1425-2
5678
DO1608C-332
COILCRAF T
R1
10
Q1
Si7456DP
2
4
123
1
T1
SCHOTT 39402
C3
0.82uF
100V
1812
C2
0.82uF
100V
1812
1
D2
MURS120
D1
MURS120
2
4
5678
R2
10
2
123
1
3
3
2
2
A
5
R31
C19
0.022uF 1K
14
15
SYNC
6
8
14
OPTODRV
VAUX
2
C33
0.1uF
50V
0805
R46
1K
PWRGGD
C22
4700pF
5
C30
4700pF
5
R34
3.01K
1%
VFB
8
OVPIN
9
MARGIN
7
2
R20
3.01K -SENSE P5
-SENSE
1%
KEYSTONE 1425-2
R21
R22
3.01K
100
1%
1/4W
1206
ICOMP
13
B
R33
2.43K
1%
TRIM
R38
1K
R47
1.78K
1%
-VOUT
R48
1.24K
1%
CONTRACT NO.
APPROVALS
NOTES: UNLESS OTHERWISE SPECIFIED
1. TO DISABLE OPTIONAL FAST START:
REMOVE C12, D8, D9, R8, R9, R11, R15, Q9, Q11; ADD R25 = 20K.
2. TO DISABLE OPTIONAL DIFFERENTIAL SENSE:
REMOVE R12, R14, R19-22, U1; ADD R28 = 0 OHM.
DRAWN:
APPROVED:
ENGINEER: BOB S.
DESIGNER:
TECHNOLOGY
KIM T.
CHECKED:
3. ALL RES. ARE IN OHMS, 0603. ALL CAP. ARE 0603.
ALL DIODES ARE MMBD914BLT1.
ALL NPNs ARE MMBT3904LT1.
ALL PNPs ARE MMBT3906LT1.
4
3
2
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
LTC Confide ntial-For Customer Use Only
TITLE:
ISOLATED SYNCHRONOUS FORWARD CONVERTER
SIZE
A
DATE:
5
P6
TRIM
KEYSTONE 1425-2
VOUT
C23
0.22uF
0805
10
7
U2
LTC1698EGN
R35
1K
+SENSE
KEYSTONE 1425-2
R14
3.01K
1%
R28
OPT
6
16
11
2
CG
FG
0805
GND
VC
10
SS
SGND
4
8
7
R37
3K
ISO1
MOC207
43 1
5VREF
R41 C26
10 3300pF
R40
10K
C29
0.01uF
VFB
9
P7
OPTIONAL DIFFERENTIAL SENSE
VOUT
VCOMP
PGND
12
3
1
VDD
1
R32
470
5
+SENSE
2
4
C21
0.1uF
50V
ISNS
8
4
3
R49
OPT
3
1
12
SG
11
50V
0805
3
-
D11
BAT54
OPT
C16
1000pF
-VIN
SYNC
15
16
17
THERM
3
SENSE
BG
NC
NC
19
TG
18
FSET
R39
52.3K
R42
1%
2.43K
C32 1%
C31
82pF
1uF
25V
1206
D14
BAT54
PULSE ENG.
T2
PA01844
1
C17
220pF
1
R27
1K
R23
1K
4
R45
1.24K
1%
RT1
100K
1206
D12
BAT54
+
1%
9V
PGND
C18
3300pF
R19
3.01K
ISNSGND
D10
MMBZ5240B
10V
Q12
FZT690B
3
C25
C28
100uF 1000pF
20V
7343
+
U1
LT1783CS5
1
R18
1001
1/4W
1206
C15
4.7uF
3
R17
10K
R16
2K
1/4W
1206
3
C13
0.22uF
50V
1206
1
R43
10K
U3
LT3781EG
6
SHDN
BSTREF
OVLO
5VREF
1
VCC
5
1
100V
1206
VBST
20
3
5VREF
C24
0.1uF
50V
0805
1
3
16V
1210
C27
0.1uF
50V
0805
-VIN
C20
0.1uF
D13
BAS21
2
-VOUT
STAFFALL
C
R12
100
1/4W
1206
9V
-VIN
R26
73.2K
1%
13
P4
VOUT
1
11
C14
330pF
D15
MMBD9 14
ON/OFF
KEYSTONE 1425-2
4
C5
C6
C7
330uF + 330uF + 330uF
6.3V
6.3V
6.3V
KEMET KEMET KEME T
7343
7343
7343
+
321
D6
MBR0540
2
1
ON/OFF 3
4
321
C11
0 OHM
1206
D7
BAT54
VCC
P2
+
R10
4.7
1206
Q10
VIN
VCC
R4
10
1/4W
1206
C4
330uF
6.3V
KEMET
7343
8765
1
3 ZVN3310F
D8
Q11
MMBT3904 MMBZ5248B
18V
R24 R25
270K OPT
1/4W 1206
1206
D
3
R11
62K
1/4W
1206
OPTIONAL FAST START
B
R3
10
1/4W
1206
Q6
Q7
Si7892DP Si7892DP
8765
1
2
C12
4.7uF
16V
1210
P8 [email protected]
+VOUT
STAFFALL
-VOUT
D4
BAS21
3
3
1
C9
1000pF
100V
1206
-VOUT
D5
MBR0540
OPT
5VREF
D9
R15
MMBD9 14 47K
1
3
+VOUT
1206
250V
2220
D3
BAS21
L2
1.0mH
VIN
1
321
R6
C10
2200pF 3.3
3
VCC
R9
100
1/4W
1206
VCC
4
321
1
4
2
C
Q9
FQT7N10LTF
-VIN
C8
1000pF
100V
1206
8765
4
R5
0.030
2010
R8
100
1/4W
1206
Q4
Q5
Si7892DP Si7892DP
8765
Q3
Si7456DP
4
VOUT
6
3
Q8
MMBT3 906
P3
-VIN
-VIN
KEYSTONE 1425-2
L3
1.5uH
5
2
C1
0.82uF
100V
1812
2
D
1
1
3
Q2
MMBT3 906
DWG NO.
DC479A-1
REV
A
LT3781EG/LTC1698EGN/LT1783CS5
Tuesday, September 24, 2002
1
SHEET
1 OF
1
A
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