DC1619A - Schematic

1
2
REVISION HISTORY
ECO
-
11-15-10
A
GND
CIN3
2.2uF
100V
1210
CIN4
2.2uF
100V
1210
* 79V CAPACITOR SURGE VOLTAGE
E2
R1
1M
RUN
GND
JP1
2
JP2
MODE
R2
97.6K
2
PULSE SKIP
4
5
6 BURST
BOOST 16
TG 15
2 SHDN
VFB
SW 14
R6
R4
R5
16.2K
1%
R12
C4
100pF
8 FSET
R9
49.9K
16V
Q1
BSC123N08N
4
D1
BAS521
VOUT
E4
R11
VOUT
0
VCC
SW
VCC
C7
1uF
16V
0603 BG
PGND 11
SENSE+ 10
TG
0
BG 12
7 SYNC
R7
20K
C5
1500pF
4.99
D3
1N4148
6 VC
(OPT)
143K
1%
VCC 13
5 VFB
C3
(OPT)
C6
0.1uF
TG
3 SS
4 BURST_EN
R3
5.1M
5%
R10
C2
1500pF
CONT .
3
LT3845AEFE
1 VIN
100V
1206
3
SHDN
1
U1
C1
0.47uF
8
7
6
5
CIN2
33uF
63V*
1
2
3
CIN1 +
33uF
63V*
R13
BG
0
L1
8
7
6
5
+
VFB
DATE
MARTY M.
VIN
J1
VCC
APPROVED
PRODUCTION FAB
J2
Q2
BSC123N08N
4
1
2
3
VIN
16V - 60V
17 SGND
A
DESCRIPTION
2
E1
1
VIN
REV
R16
6.65
1206
VS+
10uH*
D2
B160
J4
R17
VOUT
0.007
2512
COUT1 +
68uF
16V
+
C9
220pF
100V
1206
COUT2
(OPT)
COUT3
22uF
16V
1210
COUT4
(OPT)
1210
J3
GND
SENSE- 9
E5
C8
(OPT)
R14
0
R15
0
VOUT
12V, 120W
GND
E3
SYNC
R8
100K
B
B
NOTES:UNLESS OTHERWISE SPECIFIED
RESISTORS: OHMS, 0402
CAPACITORS: uF, 0402
* L1 LAYOUT PADS ARE NON-STANDARD PADS DESIGNED TO
ACCOMMODATE THE WURTH ELEKTRONIC, 74435561100 INDUCTOR
OR THE WURTH ELEKTRONIC, 7443551151 INDUCTOR
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
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
1
APPROVALS
PCB DES.
APP ENG.
NC
MARTY M. TITLE: SCHEMATIC
HIGH VOLTAGE SYNCHRONOUS BUCK
CONTROLLER WITH ADJUSTABLE OPERATING FREQUENCY
SIZE
IC NO.
N/A
SCALE = NONE
2
TECHNOLOGY
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
DATE:
11-15-10
REV.
LT3845AEFE
DEMO CIRCUIT 1619A
2
SHEET 1
OF
2
1
2
OPTIONAL BIAS CIRCUIT
OPTIONAL POWER FETS
VIN
A
VCC
A
R18
4
R19
Q3B
Si1555DL
R20
5
Q4
4
1
2
3
3
C13
1uF
6
1
Q3A
Si1555DL
SW
8
7
6
5
C12
1uF
10V
R21
TG
BG
2
10V
BG
R22
Q5
4
1
2
3
1
C11
1uF
10V
2
3
C10
1uF
10V
1
3
2
D5
BAV99
2VOUT
3VOUT
D4
BAV99
8
7
6
5
VOUT
USE OPTIONAL BIAS CIRCUIT TO BACKFEED VCC WHEN VOUT IS BETWEEN
3V AND 9V AND VCC POWER DISSIPATION EXCEEDS 250mW.
REFER TO THE LT3845AEFE DATASHEET FOR MORE DETAILS.
B
B
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
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
1
APPROVALS
TECHNOLOGY
PCB DES.
NC
APP ENG.
MARTY M. TITLE: SCHEMATIC
HIGH VOLTAGE SYNCHRONOUS BUCK
CONTROLLER WITH ADJUSTABLE OPERATING FREQUENCY
SIZE
IC NO.
N/A
SCALE = NONE
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
DATE: 11-15-10
2
REV.
LT3845AEFE
DEMO CIRCUIT 1619A
2
SHEET 2
OF
2
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