DC894A-A - Schematic

1
A
2
3
4
This circuit is proprietary to Linear Technology and supplied
for use with Linear Technology parts.
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
Applications Engineering for assistance.
5
REVISION HISTORY
ECO
REV
DESCRIPTION
2
DATE
PROTO
APPROVED
10/18/05
A
T1
5
L1
4.7uH
C30
22uF
100V
B
+
C4
100pF
R8
47K
0.25W
C25
2.2uF
100V
1
-VIN
C10
47uF
20V
E2
C5
C6
C29
[1]
[1]
[1]
OPT
[1]
B
5 6 7 8
R2
4.7
4
R7
20
Q1
Si4490DY
1 2 3
2.2nF
8 7 6 5
Q3
[1]
8 7 6 5
Q4
Si7336ADP
OPT
4
3 2 1
[1]
3 2 1
R16
169k
1%
R18
909
1%
R27
[1]
Q13
E
E
R9
0.02
0.5W
11
R28
[1]
C
CCMP
10nF
C13
47pF
0.1uF
R22
8
T2
C20
2.2nF
1
C
C21
1uF
5
C19
2.2nF
B
R26
15
C8
0.1uF
C23
FMMT618
FMMT718
R4
330
9
13
SFST
12
B
SG
SGND/PGND
VC
C17
R13
10K
D5
BAT54
4
PA0184
20K
C18
10nF
OPT
R19
100k
D
SENN
17
OSCAP
7
ENDLY
ROCMP
4
3
R20
12k
14
1%
SYNC
PGDLY
R15
3.01k
R14
15k
1%
1
16
UVLO
TON
C12
OPT
SENP
U1
LT3825EFE
5
15
C
Q12
SG
6
C
10
PG
2
VCC
FB
-VOUT
C7
4.7nF
250V
D7
4
SG
8
+VOUT
[1]
E4
C3
R1 0
R3
[1]
1%
C2
10
11
12
3
4
0.1uF
D2
BAS21LT1
R5
412K
1%
2
E3
C1
56
C11
+
R6
1
36V- 72V
L2 [1]
7
8
9
6
2
1
2
+VIN E1
[1]
D
[1]
ASSY.
VOUT
IOUT
R3
R28
R27
-A
3.3V
12A
-B
5V
8A
28.7K
OPT
47
B0540W
470uF
47uF
47uF
42.2K
OPT
47
B0540W
470uF
47uF
47uF
TBD
-C
12V
4A
30.9K
0
OPT
OPT
47uF
22uF
OPT
TBD
D7
C29
C1,C2
C5
T1
L2
Q3
PA1477NL
0.1uH
Si7336ADP
0.1uH
Si7336ADP
1.0uH
Si4470EY
CONTRACT NO.
APPROVALS
DRAWN
mei
DATE
TECHNOLOGY
03/17//05
TITLE
CHECKED
E
SCH, LT3825EFE, SYNCHRONOUS FLYBACK CONVERTER
APPROVED
ENGINEER
SIZE
DESIGNER
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
CAGE CODE
DWG NO
REV
2
DC894A
Tuesday, January 10, 2006
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SCALE:
4
FILENAME: 894A-2.DSN
SHEET
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OF
1
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