DC1544A - Schematic

5
4
3
2
1
REVISION HISTORY
ECO
REV
DESCRIPTION
DATE
3
PRODUCTION
05/14/10
D
L1 10uH
CDRH104RNP-100NC
E8
25
EN/UVLO
1
SYNC
2
NO SYNC
E5
R2
95.3k
1%
0402
3
34
E1
INTVCC
INTVCC
28
SYNC
FBX
U1
INTVCC
R4 41.2k 1%
300kHz
33
NC
0402
NC
C7
22nF
0402
NOTES: UNLESS OTHERWISE SPECIFIED,
1. ALL CAPACITORS AND RESISTORS ARE 0402.
2. ALL CAPACITOR VALUES ARE IN MICROFARADS.
3. ALL RESISTOR VALUES ARE IN OHMS.
CUSTOMER NOTICE
31
1
2
10
35
36
GND
CONTRACT NO.
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A APPROVALS
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES. MI
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
ENG. KEITH S.
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
4
C
12
GND
13
GND
GND
14
15
GND
GND
16
SGND
SGND
SGND
6
C11
OPT
0402
C8
0.33uF
0603
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
5
VOUT
C6
24V @ 600mA
4.7uF
50V
1210 E7
GND
B
17
37
23
R3
6.8k
0402
NC
SGND
C12
OPT
0402
VC
4
30
B
A
RT
24
SGND
NC
SS
E9
C5
4.7uF
50V
1210
R6
15.8k
1%
0402
NC
32
SGND
R5
226k
1%
0402
C10
OPT
0402
LT3957EUHE
C9
4.7uF
10V
0603
E2
C4
4.7uF
50V
1210
3
R7
0
0402
SENSE1
JP1
C3
4.7uF
50V
1210
8
SENSE2
C13
OPT
0402
SYNC
E6
3
SW
9
20
21
38
EN/UVLO
SW
GND
SW
E10
C2
2.2uF
50V
1210
SW
R1
200k
1%
0402
GND
C1
2.2uF
50V
1210
27
E4
VIN
VIN
4.5V - 20V
KEITH S.
D
D1
PDS360
2
SW
E3
C
1
APPROVED
3
TECHNOLOGY
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
TITLE: SCHEMATIC
A
BOOST, FLYBACK, SEPIC AND INVERTING
CONVERTER WITH 5A, 40V SWITCH
SIZE
LT3957EUHE
DEMO CIRCUIT 1544A
IC NO.
N/A
DATE:
Friday, May 14, 2010
2
SHEET
1
REV
3
1 OF 1
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