DC894B - Schematic

1
2
3
4
5
REVISION HISTORY
ECO
REV
DESCRIPTION
DATE
APPROVED
1
PRODUCTION
06/03/11
KURK M.
T1
5
[1]
+VIN E1
6
2
1
L1
L2 [1]
7
8
9
A
E3
C1
C2
C5
C6
C29
[1]
[1]
[1]
OPT
[1]
+VOUT
A
[1]
4.7uH
36V- 72V
C30
22uF
100V
+
C4
100pF
R8
47K
0.25W
C25
2.2uF
100V
-VIN
R11 [1]
C11
+
0.1uF
5 6 7 8
R1 0
B
R3
[1]
1%
R10
[1]
E4
C3
D2
BAS21LT1
R5
412K
1%
3
4
R6 [1]
C10
47uF
20V
E2
10
11
12
R2
[1]
4
R7
[1]
Q1
[1]
1 2 3
[1]
8 7 6 5
Q3
[1]
8 7 6 5
Q4
Si7336ADP
OPT
4
D7
4
3 2 1
3 2 1
R27
[1]
R18
[1]
1%
SENN
SGND/PGND
12
R9
E
FMMT718
[1]
11
C
9
CCMP
8
C23
C17 C18
C13
47pF 10nF
OPT
0.1uF
R26
15
C8
0.1uF
[1]
1
[1]
1uF
5
C20
2.2nF
[1]
C21
C
T2
C19
R22
FMMT618
R4
330
0.5W
13
SFST
VC
6
OSCAP
E
R28
[1]
B
SENP
17
7
Q13
B
SG
PG
ENDLY
ROCMP
4
3
R16
169k
1%
14
1%
R20
12k
1
16
2
VCC
R15
3.01k
R14
15k
1%
OPT
TON
C12
C
PGDLY
SYNC
15
C
Q12
SG
U1
LT3825EFE
UVLO
5
10
FB
B
[1]
SG
8
-VOUT
C7
4.7nF
250V
4
R13
10K
D5
BAT54
PA0184
R19
100k
[1]
ASSY.
VOUT
IOUT
R2
R6
R7
R9
-A
3.3V
12A
4.7 28.7K 110
39
-B
5V
8A
4.7 29.4K 150
-C
12V
5A
15
R3
R10
R11
R18
R22
R28
R27
0.02
39
110
909
20K
OPT
47
20
0.012
OPT
150
787
2K
OPT
47
68
0.012
OPT
160
1.5K
7.5K
D7
C5
C19
C23
C29
2.2nF
47uF
2.2nF
10nF
47uF
2.2nF
47uF
220pF
22uF
470pF
OPT
330pF
C1,C2
C3
B0540W
47uF
B0540W
OPT
Q3
T1
L2
470uF
PA1477NL
0.1uH
Si4490DY
Si7336ADP
2.2nF
470uF
PA1735NL
0.1uH
Si4490DY
Si7336ADP
3.3nF
150uF
PA1736NL
1.0uH
Si7450DP
Si4470EY
Q1
D
D
30.9K 160
0
OPT
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
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
E
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
1
2
3
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
MI
KURK M.
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
E
TITLE: SCHEMATIC
SYNCHRONOUS FLYBACK CONVERTER
SIZE
N/A
SCALE = NONE
4
IC NO.
LT3825EFE
REV.
DEMO CIRCUIT 894B
DATE: Monday, August 15, 2011
SHEET 1
5
1
OF 1
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