9
dc2641af
DEMO MANUAL DC2641A
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
SCHEMATIC DIAGRAM
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
A
A
B
B
C
C
D
D
VOUT
GND
FCM
P.S.
BURST ADJ.
BURST DEFAULT
7443633300
MSS104BT
EXTVCC
INTVCC
INTVCC
INTVCC
VIN
INTVCC
INTVCC
INTVCC
VIN
VIN
VIN
VIN
VOSP
VOSP
TG
SW
BG
SW
2SW
SIZE
DATE:
IC NO.
REV.
SHEET
OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
Fax: (408)434-0507
Milpitas, CA 95035 Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
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 CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
3
Monday, April 10, 2017
1
1
HIGH VOLTAGE DC-DC BUCK REGULATOR
LT
D L
N/A
LTC7801UFD
DEMO CIRCUIT 2641A
SIZE
DATE:
IC NO.
REV.
SHEET
OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
Fax: (408)434-0507
Milpitas, CA 95035 Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
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 CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
3
Monday, April 10, 2017
1
1
HIGH VOLTAGE DC-DC BUCK REGULATOR
LT
D L
N/A
LTC7801UFD
DEMO CIRCUIT 2641A
SIZE
DATE:
IC NO.
REV.
SHEET
OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
Fax: (408)434-0507
Milpitas, CA 95035 Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
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 CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
3
Monday, April 10, 2017
1
1
HIGH VOLTAGE DC-DC BUCK REGULATOR
LT
D L
N/A
LTC7801UFD
DEMO CIRCUIT 2641A
REVISION HISTORY
DESCRIPTION
DATE
APPROVED
ECO
REV
DL
PRODUCTION
3
04/10/17
REVISION HISTORY
DESCRIPTION
DATE
APPROVED
ECO
REV
DL
PRODUCTION
3
04/10/17
REVISION HISTORY
DESCRIPTION
DATE
APPROVED
ECO
REV
DL
PRODUCTION
3
04/10/17
E10
RUN
R11 OPT
R38
OPT
JP2
ON
OFF
VBIAS
1
3
2
U1
LTC7801UFD
INTVCC
20
OVLO
21
DRVSET
9
DRVUV
10
TG
11
FREQ
8
PGOOD
7
RUN
19
SENSE1-
23
GND
25
BG
14
BOOST
13
PLLIN
6
22
NDRV
16
DRVCC
15
GND
4
MODE
3
EXTVCC
18
VIN
17
SS
24
VFB
1
ITH
2
CPUMP_EN
5
SW
12
R36 10 1%
C13 0.1uF
C14
4.7uF 100V 1812
JP7
E2
VIN-
R27
0
R9 10M 0805
R29 0
Q2
BSC190N12NS3G
1
2
5
3
4
R31 2M 1%
COUT1 22uF 16V 1210
R14
10k
JP3
RS1
0.006 2512
C1
OPT
R32 267k 1%
R37
OPT
C9
10pF
L1
33uH
E8
PGOOD
J1
VIN
16V - 100V
C3 1nF
CIN4
4.7uF 100V 1812
C8
OPT
JP6
JP4
MODE
1
2
3
4
5
6
7
8
Q3 BSC190N12NS3G
1
2
5
3
4
R33 OPT 1206
Q1 OPT
2
3
1
+
COUT2 150uF 16V
7343
CIN5
OPT 100V 1812
E9
PLLIN
CIN6 1uF 100V 0805
R21
OPT
C7
1uF
R24
0
R34 196k
C5
OPT
C12
4.7uF
D1
OPT
R35
0
C16
OPT
R17
100k
CIN3
4.7uF
100V 1812
R13 10K
+
COUT3 150uF 16V 7343
J2
GND
C4
0.1uF
C2
0.1uF
R15
140k
1%
R25
30.1k 1%
L2
470uH
R8
0
R40
OPT
+
COUT4 OPT
7343
R18
49.9k
1%
R28
0
Q6 OPT
2
3
1
Q5 OPT
1
2
5
3
4
R16
100k
E6
EXTVCC
R26 80.6k 1%
R7 OPT
R12 2.2 0805
J4
GND
CIN7 1uF 100V 0805
CIN2 1uF 100V 0805
CIN8
4.7uF 100V 1812
C6
4700pF
E3
JP1
ON
OFF
RUN
1
3
2
R39
OPT
+
CIN1 100uF 200V
Q7 OPT
2
3
1
C11 0.1uF
100V
1206
R2
0
R30 10 1%
D2 OPT
C10
100pF
E5
MODE
R23
100K
R22
0
R1 OPT 0805
R20
OPT
J3
VOUT
12V/10A
U2
LTC3639EMSE
SW
1
NC
2
VIN
3
NC
4
FBO
5
VPRG1
7
VPRG2
6
GND
8
VFB
9
SS
10
ISET
11
OVLO
12
NC
13
RUN
14
NC
15
GND
16
GND
17
R6
301k
1%
E7
SS
JP5
ON
OFF
100% DUTY
1
3
2
E1
VIN
R19
OPT
C15 4.7uF 16V 1812
E4
Q4 BSC077N12NS3G
1
2
5
3
4
SENSE1-
SW
TG
VOUT
SENSE1-
EXTVCC
BG
SW
TG
BG