DC974A - Schematic

4
3
2
1
REVISION HISTORY
This circuit is proprietary to Linear Technology and supplied
for use with Linear Technology parts.
Customer Notice:Linear Technology has made a best effort to
design a circuit that meets customer-supplied specifications;
however, it remains the customers 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
Applications Engineering for assistance.
E1
VIN
15V-60V
ECO
REV
-
0
DESCRIPTION
DATE
PROTOTYPE (974A_09.PCB/97A_REV0.DSN)
APPROVED
-
09/08/05
VIN
+
CIN2
2.2uF
100V
R1
1M
0805
GND
E2
GND
B
CIN1
68uF
63V
B
JP1
VOUT
1
ON
2
U1
LT3844EFE
VIN
2
SHDN
3
2
BURST
1
0.01uF
VFB
3
R6
1M
0603
VC
R7
14.7K
1%
R14
(Opt)
R8
130K
1%
R9
82.5K
1%
C12
(Opt)
BOOST 16
TG 15
SS
SW
4
BURST_EN
5
VFB
6
VC
7
SYNC
8
RT
VCC
13
PGND
12
Sgnd
Q1
Si7852DP
0 Ohm
R16
VOUT
L1
SW
10
R5
15uH
IHLP-5050EZ-01-15uH-M
VCC
D1
BAS19
C4
0.1uF
10%
9
C5
1uF
16V
E3
VOUT
12V @ 4.2A
VOUT
0.015
1%
+
D2
PDS5100H
SENSE+ 11
SENSE- 10
C6
120pF
R15
49.9K
1%
C7
680pF
14
C2
0.22uF
16V
COUT1
180uF
16V
COUT2
10uF
16V
GND
E4
GND
2
JP2 VCC
MODE
FIXED
1
R2
Sgnd
C3
3
C1
1000pF
100V
1
R3
113K
1%
VIN
3
17
OFF
D5
1N4148WS
SEE NOTE (1)
E6
SYNC
A
NOTES: 1. If the SYNC function is not being used
tie the Sync pin to ground.
OPTIONAL BOOST BIAS CIRCUIT
(DO NOT INSTALL)
VCC
R10
L2
0 Ohm
10UH
ZHCS400
C9
1uF
16V
C10
220pF
R11
107K
1%
R12
10K
R13
12.4K
1%
A
VOUT
D3
1
D4
ZHCS400
(Opt)
C8
4.7UF,6.3V
0805
5
SW
3
VCC
E5
VBIAS
9V-20V
(Opt)
VIN
FB
SHDN
GND
4
U2
LT1613CS5
+
2
C11
22uF
35V
(Opt)
LTC CONFIDENTIAL - For Customer Use Only
UNLESS OTHERWISE SPECIFIED
DIMENSIONS ARE IN INCHES
TOLERANCE ON ANGLE - - 2 PLACES - - - 3 PLACES - - INTERPRET DIM AND TOL
PER ASME Y14.5M -1994
DRAWN RB
08/24/05
THIRD ANGLE PROJECTION
CHECKED -
-
CONTRACT NO.
APPROVALS
APPROVED -
-
ENGINEER D. CANNY
08/24/05
DESIGNER -
3
-
Tuesday, February 21, 2006
DO NOT SCALE DRAWING
4
DATE
2
TECHNOLOGY
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
TITLE
SCH, HIGH VOLTAGE STEP-DOWN CONTROLLER
SIZE
CAGE CODE
SCALE: NONE
DWG NO
REV
DEMO CIRCUIT 974A
FILENAME: 974A_Rev1.DSN/PCB SHEET
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