DC1268B - Schematic

REVISION #
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.
REVISION HISTORY
SD PC AD FD
R13
R14
(Opt)
0805
0
0 0 0
1
1
DESCRIPTION
DATE
APPROVED
1st Release
(-A) Change R20, C13, D2 to Opt. C7 to 0.1uF. 07/02/09
Kz
PWMDRAIN
(Opt)
1206
E2
M3
(Opt)
LED BUCK / BUCK-BOOST
C9
E14
E1
PVIN
8V - 40V
(Opt)
L1
22uH
HC9-220-R
OUT
D1
1
Cooper Bussmann
E3
R1
499k
1%
GND
C10
4.7uF
50V
R2
0 Ohm
PDS560-13
VIN
4.5V - 40V
C4
1uF
50V
E6
U1
SHDN / UVLO
C11
2.2uF
100V
*
1
E10
3
7
INTVCC
R18
(Opt)
*
VIN
GATE
GND
E15
GND
SENSE
SHDN/UVLO
FB
VREF
ISP
12
14
E8
13
CTRL
PWMOUT
*
*
INTVCC
C5
4.7uF
10V
PWM
SS
VC
GND
RT
4
15
17
5
R3
11
R19
0 Ohm
0805
2
INTVCC
R11
R17
22k
R20
(Opt)
E12
GND
(Opt)
C7
0.1uF
C6
2200pF
LED BOOST
M2
Si2308DS-T1-E3
VISHAY
0 Ohm
D2
(Opt)
PWM
E13
R9
22.1k
1%
9
ISN
R7
140k
1%
R10
R6
1M
1%
PWMDRAIN
CTRL
R16
(Opt)
10
R5
(Opt)
16
E11
8
LED +
1A
0.10
1%
C12
(Opt)
RS1
6
R15
1M
C8
(Opt)
C3
2.2uF
100V
0.015
R4
90.9k
1%
*
C2
2.2uF
100V
M1
Si7850DP-T1-E3
VISHAY
E5
E7
RS2
3
2
C1
4.7uF
50V
R8
28.7k
1%
400kHz
PWM
E9
PWM
(Opt)
C13
(Opt)
APPROVALS
*
ASSY
U1(IC)
U1-3 (Name)
E11 (Name)
R10
-A
LT3755EUD-2
OPENLED
OPENLED
100k
-B
LT3755EUD-1
SYNC
OPT
SYNC
DRAWN: Rudy Bautista
ENGINEER:
Keith Szolusha
LINEAR TECHNOLOGY CORPORATION
1630 McCARTHY BLVD
MILPITAS, CA. 95035
(408)432-1900
(408)434-0507 (FAX)
Title:
LT3755EUD-1/-2
APPROVED:
CHECKED:
Date:
Tuesday, July 07, 2009
SD
Document Number
www.linear.com
LTC Confidential For Customer Use Only
High Voltage LED Controller
Rev
Demo Circuit 1268B
C:\ORCADWIN\CAPTURE\1268B\1268B_REV1.DSN
Sheet
1
1
of
1
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