DC649A - Schematic

5
3
+Vin
T1
+Vout
CTX-02-15242
C
Q2
MMBTA42
8.5V
R3
8.06K
1
2
5
6
1
Ith/RUN NGATE
6
2
GND
5
3
Vfb
C03
100uF
6.3V
Vcc
SENSE
GND
E5
C12
150pF
200V
Q1
FDC2512
3
11
4
D3
BAS516
U1
LTC3803ES6
470pF(opt.) 82K (opt.)
C
C02
100uF
6.3V
Ith
E4
R4
C01
100uF
6.3V
R20
100K
E
B
PDZ-9.1B
9.1V
C4
D
R1
220K
D2
C11
22pF
(opt.)
9
2
1uF
100V
R21
220
4
E3
+Vout
[email protected]
10
Cin1
E2
UPS840
-Vin
SHDN
1
D1
E1
36V-72V
D
2
12
+Vin
4
Rs1
4
C
4.7K
Rcs
0.068
C1
1uF
10V
+Vout
R6
42K (opt.)
8.5V
D4
BAS516
Ith
R8
470K
B
NOTE :
To convert to non isolated design,
remove the opto coupler and
LT1431 circuit. Place a short across
C10 and install R6. Also, add C4
and R3.
R22
6.8K
R19
C2
U3
8
47nF
1
7
6
2
5
3
4
100
C3
10V
R2
4.75K
4.7nF
R18
C5
1
C
Ref
8
2
COMP
Rmid
7
3
V+
GND-F
6
4
Rtop
GND-S
5
U2
LT1431CS8
CONTRACT NO.
APPROVALS
DATE
June Wu
2/11/03
Goran Perica
2/11/03
CHECKED
TECHNOLOGY
5
4
3
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
A
TITLE
LTC3803ES6, Telecom DC/DC Converter
APPROVED
ENGINEER
R5
10K
1uF
C10
2200pF
250V
DRAWN
B
10K
MOCC207
A
R7
220
DESIGNER
SIZE CAGE CODE
Monday, August 25, 2003
SCALE:
2
FILENAME:
DWG NO
REV
A
DC649A
SHEET
1
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OF
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