9
dc2117af
DEMO MANUAL DC2117A
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
3
PROD
06/26/15
W_
4
PROD - Parts addition
03/30/16
W_
SENSE1-
SW
TG
VOUT
SENSE1-
EXTVCC
BG
SW
TG
BG
EXTVCC
INTVCC
INTVCC
INTVCC
INTVCC
VIN
INTVCC
INTVCC
INTVCC
INTVCC
INTVCC
VIN
VIN
VIN
VIN
VOSP
VOSP
VIN
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
4
Tuesday, May 03, 2016
1
1
HIGH INPUT VOLTAGE SYNCHRONOUS
`\
W _A
N/A
LTC3895EFE
DEMO CIRCUIT 2117A
BUCK CONVERTER
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
4
Tuesday, May 03, 2016
1
1
HIGH INPUT VOLTAGE SYNCHRONOUS
`\
W _A
N/A
LTC3895EFE
DEMO CIRCUIT 2117A
BUCK CONVERTER
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
4
Tuesday, May 03, 2016
1
1
HIGH INPUT VOLTAGE SYNCHRONOUS
`\
W _A
N/A
LTC3895EFE
DEMO CIRCUIT 2117A
BUCK CONVERTER
REVISION HISTORY
DESCRIPTION
DATE
APPROVED
ECO
REV
W_
PROTO
1
05/28/13
REVISION HISTORY
DESCRIPTION
DATE
APPROVED
ECO
REV
W_
PROTO
1
05/28/13
REVISION HISTORY
DESCRIPTION
DATE
APPROVED
ECO
REV
W_
PROTO
1
05/28/13
C3 1nF
+
COUT3 OPT
7343
J1
VIN
14V - 130V
R10
0
R16
100k
Q5 OPT
1
2
5
3
4
Q4 BSC520N15NS3G
1
2
5
3
4
Q3 BSC520N15NS3G
1
2
5
3
4
Q6 OPT
2
3
1
J4
GND
C7
1uF
R21
OPT
J3
VOUT
12V, 5A
E11
PGOOD
E10
R13 10K
1%
CIN3
0.47uF
200V
R31 2M
1%
R4
OPT
L2
470uH
Q2
BSC520N15NS3G
1
2
5
3
4
JP4
MODE
1
2
3
4
5
6
7
8
R25
30.1k
1%
C15 4.7uF
16V
R36 10
1%
U1
LTC3895EFE
INTVCC
38
OVLO
1
VPRG
2
DRVSET
18
DRVUV
19
TG
20
NC
16
FREQ
17
PGOOD
14
RUN
34
PHASMD
36
SENSE1-
4
GND
39
BG
24
BOOST
22
PLLIN
13
3
GND
12
NDRV
28
DRVCC
26
GND
9
MODE
8
EXTVCC
32
VIN
30
SS
5
VFB
6
ITH
7
CLKOUT
11
CPUMP_EN
10
ILIM
37
GND
15
SW
21
L3
1.0uH
R30 10
1%
R2
1.74k
1%
R17
100k
R5
OPT
R29 0
C16
OPT
E6
VIN-
E7
CIN6 0.1uF
200V 1210
E9
PLLIN
R19
OPT
R15
140k
1%
C11
0.033uF
200V
Q7 OPT
2
3
1
R35
0
R9 10M
R28
0
CIN5
0.47uF
200V
JP8
ON
OFF
VBIAS
1
3
2
R20
OPT
C2
0.1uF
L1
33uH
R1 191k
1%
C9
10pF
R12 2.2
JP6
D1
OPT
R37
OPT
E2
VIN
JP7
C12
4.7uF
C8
OPT
C4
0.1uF
+
COUT2 150uF
16V 7343
CIN4
0.47uF
200V
E8
CLKOUT
R18
49.9k
1%
C6
4700pF
+
COUT4 OPT
7343
R27 0
R40
OPT
E5
MODE
JP5
ON
OFF
100% DUTY
1
3
2
R7 OPT
C5
OPT
R32 267k
1%
R38
OPT
R3 OPT
R14
10k
Q1 OPT
2
3
1
R34 196k
C1
OPT
+
CIN1 100uF
200V
E3
SS
CIN8
OPT
200V
C14
0.47uF
200V 1812
C10
100pF
R24
0
R39
OPT
R6
301k
1%
R26 80.6k
1%
RS1
0.006
2512
JP2
120
180
90
PHASE MD
1
3
2
4
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
R33 OPT
R22
0
CIN2
0.47uF
200V
JP3
D2 OPT
CIN7 0.1uF
200V 1210
R11 OPT
JP1
ON
OFF
RUN
1
3
2
COUT1 22uF
16V 1210
R8
0
R23
100K
E12
EXTVCC
J2
GND
C13 0.1uF
E4
RUN