DC677A - Schematic

4
1
11
8
+VT1
5
2
SW0
10
C3
1000pF
250V
C18
0.1uF
50V
R9
(Opt.)
TP4
7
EN/Shdn
6
IN
R39
57.6K
C29
(Opt.)
R62
10K
R29
33K
U1
LT1952EGN-1
ROSC1
115K
2.5VR
R59
13.3K
C30
100pF
R46
22.1K
R56
309K
C28
1uF
16V
RCS1
0.018
VFB
R40
2.2K
1
Comp
2
3
OUT
Sout
16
FB=1.23V
Vin
15
Rosc
Out
14
4
Sync
PGND
13
5
SS/MaxDC
Delay
12
6
Vr=2.5V
OC
11
7
SD/Vsec
Isense
10
8
GND
Blank
9
VU1
D11
BAT760
1
CU1
0.1uF
50V
2
C14
100pF R5
57.6K
R41
0
R12
910
R15
39K
3
OUT
1
6
3
R21
10K
2
5
3
4
U5
LT4430ES6
SYNC
C16
0.22uF
10V
R25
820
C13
0.33uF
C12
0.1uF
R44
220K
VAUX
R14
10K
VAUX
R13
47
1
Q20B
5
R6
10K
C42
2200pF
250VAC
T2
PA1323
PULSE ENG.
R2
Opt.
1
SW1
1
VCC
OPTO
6
2
GND
COMP
5
3
OC
FB
4
C4
2200pF
C6
(Opt.)
C9
1uF
16V
R22
4.12K
1
CS+
8
SYNC
2
CS-
TIMER
7
3
CG
GND
6
4
VCC
FG
5
R20
38.3K
1%
2
C23
470pF
R17
10
Q21A
PBSS4140DPN
FG
Q21B
5
+VO1
VU1
R23
100K
C31
47pF
Q8A
Opt.
OUT
Q9
Opt.
R42
Opt.
C
SYNC
U3
LTC3900CS8
Option 2
R26
22.1K
Q19
2N7002
1
C1
0.33uF
R53
Opt.
R10
Opt.
B
C34
Opt.
2
GDO
CS
5
R47
169K
VAUX2
Q8B
3
R7
(Opt.)
2
4
2.5VR
R36
(Opt.)
C40
0.01uF
1
5
2
R18
270
R48
10
C27
220pF
C19
100pF
6
C17
(Opt.)
CG
1
Q5
BC857BF
R60
30.1K
CS
R49
332K
C11
(Opt.)
U2
HCPL-M453
C26
10uF, 16V
R4
22K
C7
0.1uF
2.5VR
R11
100
R16
10
D8
(Opt.)
3
FB
VU1
Q1
Si7450DP
2
SGND
R19
2.2
C2
1uF
16V
Q20A
PBSS4140DPN
2
4
2
3
4
R51
(Opt.)
R52
0
+VS
8
5
1
B
9
Vin
U4
LTC4441MSE
TP5
VFB
1
DrVcc
Rblank
1
R31
(Opt.)
D5
(Opt.)
J2
VAUX
3
2
Ext.
Sync
Blank
3
2
C
C10
220pF
2
VU1
D
-Vout
3
D2
BAS516
D4
(Opt.)
10
1
R55
53.6
OUT
2
J1
TP2
Q11
(Opt.)
1
TP1
CSYS
+ 470uF
6.3V
UCC
PXE
CO5
(Opt.)
CO1
(Opt.)
2
11
OUT
PGND
GND
1
VAUX2
1
2
2
GDO
CO2
CO3
CO4
Q16
Q17
Q18
HAT2165H
D3
(Opt.)
C8
(Opt.)
+VO1
100uF
6.3V
TDK
Q13
CG
Q14
Q15
HAT2165H
T1
Pulse PA0950
2
-Vin
D6
PDZ12B
FG
7
1
4
1
C21
0.1uF
L1
.65uH
PA1382.650
5
2
4
1
SW1
6
3
D1
BAS516
CIN1
CIN5
(Opt.)
2
6
Q6
PZTA42
R32
82K
1
D10
Opt.
2
CIN2
CIN3
CIN4
3
1
2.2uF
100V
TDK
D
R8
82K
1206
+Vout
+3.3V at 50A
1
4
2
Isolation Boundary
4
TP3
D7
BAS516
R3
10
3
Q7
PBSS4350Z
4
3
2
6
R50
Opt.
1
6
R1
(Opt.)
2
1
+VS
1
R54
0
2
+VT1
1
VU1
+Vin
36V-75V
3
4
5
1
R58
39.2K
2
GDO
R24
2.2
GDO
CS
Q2
Si7450DP
5
RCS2
0.018
R33
1K
R34
220K
+VS
1
SW0
R27
Opt.
R35
22K
CS
Q3
Opt.
C24
1000pF
R45
806
U6
LTC3803ES6
ITH/RUN G
6
2
GND
5
4
VFB
R30
10K
VIN
SNS
1
R37
10K
4
C25
1uF
16V
3
R57
(Opt.)
D16
BAS516
4 2
C20
2.2uF
10V
D17
BAS516
Q10
FDC2512
R43
100
VAUX
1
5
R38
2.2
1
3
RCS4
Opt.
T3
PA1546
8
C5
0.1uF
100V
1206
Optional
Circuit
SW0
A
D15
BAS516
2
D9
PDZ5.1B
2 2
R28
2.2
R61
4.7
1
C15
47pF
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.
LINEAR TECHNOLOGY CORPORATION
1630 McCARTHY BLVD.
MILPITAS, CA. 95035
408-432-1900
408-434-0507 FAX
7
RCS3
0.1
1206
VU1
Customer Notice
C22
2.2uF
10V
Title
2
LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY
48Vin to 3.3V, 50A Isolated DC/DC Converter
Size
Document Number
Date:
Wednesday, October 12, 2005
Rev
DEMO CIRCUIT 677A
Sheet
1
1
of
1
A
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