DC781A - Schematic

4
3
2
2
5
2
D4
PDZ-8.2B
2
1
1
+VIN
C3
1000pF
T1
PA1006
VB1
R1
560
R3
34k
1
ITH/RUN
2
GND
3
G
6
R7
9
4
7
Q1
FDC2512
3
C1
1uF,10V
* 16.9k
3
2
RSC
4.7k
SNS 4
VFB=0.8V
D1
BAS516
1
2
R2
0
VIN 5
*
GND
R8
220k
1206
OPT
R6
25.5k
E2
R10
OPT
U1
LTC3803ES6
R4
8.06k
GND
1
4
CIN1
1uF,100V
1210
C
R5
0
D
Q2
Si9803DY
5
6
7
8
1
2
3
+VOUT
+VOUT
CO1-CO3
100uF,6.3V
1812
GND
E3
E4
D3
VB1
BAS516
2
1
1
2
5
6
+VIN E1
36V-72V
R9
220k
1206
+VIN
D2
BAS516
OPT
C2
0.1uF
1
+VOUT
3.3V/ 5V @ 2A
GND
IF FDC602P IS USED FOR Q2:
R2=100 OHMS
R5=10 OHMS
D1, D2 = BAS516
C
4
8.2V
Q3
MMBTA42-7
3
D
1
RCS
0.082
1206
+VOUT
B
B
JP1
VOUT
3.3V
5V
5V OUTPUT, USE SINGLE
* FOR
42.2k, 1% RESISTOR.
CUSTOMER NOTICE
NOTES: UNLESS OTHERWISE SPECIFIED
A
1. ALL RESISTORS ARE IN OHMS, 0805.
ALL CAPACITORS ARE 0805.
2. INSTALL SHUNT ON JP1 PIN 1 AND 2.
CONTRACT NO.
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
CIRUIT 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.
5
4
3
APPROVALS
DRAWN:
CHECKED:
APPROVED:
ENGINEER: GORAN P.
DESIGNER:
TECHNOLOGY
KIM T.
TITLE:
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
SCHEMATIC
A
HIGH EFFICIENCY SYNCHRONOUS NONISOLATED FLYBACK
SIZE
DWG NO.
A
DATE:
DC781A-1*LTC3803ES6
Friday, October 29, 2004
2
SHEET 1
1
REV
A
OF 1
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