DC1940A - Schematic

5
4
3
2
1
REVISION HISTORY
ECO
REV
__
E1
VIN
VIN
INTVCC
16V - 60V
J2
GND
C2
2.2uF
100V
1812
C1
2.2uF
100V
1812
2.2
C3
56uF/63V
+
DATE
VICTOR K.
04-16-12
VOUT
63HVH56M
SUN ELECT.
R3
OPT
C4
0.1uF
100V
INTVCC
R2
0
30.1K
E2
D
R6
R4
100k
GND
C5
10pF
U1
R5
511K
0805
LTC3891EUDC
PGOOD
VOUT
17
9
15
4.7uF
0805
19
R12
OPT
4
VIN
1
ON
OFF
8
C9
0.1uF
2
2
3
3
16
C11
OPT
R16
57.6K
JP1
C12
R17
TRACK/SS
RUN
SENSE-
SENSE+
BOOST
1
PGND
TG
PLLIN/MODE
B
INTVCC
JP2 MODE
1
2
R20
100K
ILIM
INTVCC
BG
OPT
R21
4
PULSE SKIP
5
6
BURST
100
C19
OPT
VIN
1812
OPT
Q4
Q1
4
VOUT
11
13
RJK0653DPB
OPT
Q3
Q2
4
R19
FCM
3
DFLS1100
RJK0651DPB
4
L1
RS1
0.003
10uH
2512
E6
VOUT
J3
VOUT
C22
C21
C20
4
1
2
3
C18
OPT
SGND
1K
C10
2.2uF
100V
VIN
21
E8
10
D1
INTVCC
C13
0.1uF
SW
18
R15
2
SGND
C14
47pF
R18
SYNC
12
C
R13
6
ITH
SGND
0
C8
2.2pF
15.4K
4.7nF
R10
5
5
E5
C6
1
2
3
TRACK
RUN
INTVCC
INTVCC
14
C7
1uF
R11
OPT
R14
1 Meg
0805
EXTVCC
VFB
5
OPT
E4
PGOOD
R7
35.7K
20
7
C15
10uF
1206
+
OPT
7343
1
2
3
EXTVCC
R8
0
FREQ
5
R9
VIN
1
2
3
E3
C
APPROVED
PRODUCTION
R1
5
D
VIN
J1
DESCRIPTION
2
12V / 15A
C16
+ 150uF
16V
16SVPC150M
C17
1uF
B
J4
E7
GND
GND
OPT
GND
E9
GND
E10
CUSTOMER NOTICE
A
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES.
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APP ENG.
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
NOTES:
1. ALL RESISTORS AND CAPACITORS ARE 0603
2. INSTALL SHUNTS AS SHOWN.
3. FOR SYNCHRONIZATION REMOVE JUMPER JP2 'MODE'
AND CONNECT SOURCE OF THE SYNC SIGNAL TO
TERMINALS E8 'SYNC' AND E9 'GND'
5
APPROVALS
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
4
3
TECHNOLOGY
LT
VICTOR K
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
TITLE: SCHEMATIC
LOW QUIESCENT CURRENT HIGH VOLTAGE STEP-DOWN CONVERTER
SIZE
N/A
SCALE = NONE
2
DATE:
IC NO.
LTC3891EUDC
REV.
DEMO CIRCUIT 1940A
Monday, April 16, 2012
SHEET 1
1
2
OF 1
A
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