DC2176A - Schematic

L1
TP2
GND
6.8µH
74437324068
TP1
U1
LT3909EDD
E1
2
VIN
7V-36V
E2
R9
(Opt)
GND
C5
+ 10µF
50V
7343
VIN
SW
C1
R4
1µF
402k 50V
0805
VOUT
E3
3
EN/UVLO
EN/UVLO
FB
D1
12
11
SBR1A40S3
(Opt)
R2
976k
6
R3
31.6k
R5
130k
1
R6
100k
5%
R11
(Opt)
R8
100k
R10
(Opt)
R1
4
R12
CTRL
5
1k
5%
E5
7
PWM
E6
8
FAULT
E7
GND
R7
(Opt)
INTVCC
LED1
C3
1µF
24.9k
E4
C2
2.2µF
50V
1206
ISET
LED2
E9
10
LED1
35V LED
9
LED2
35V LED
GND
E12
PWM
C4
10nF
(Opt)
*
E11
CTRL
FAULT
*
E10
GND
GND
13
THE DEMO MANUAL FOR LED
* SEE
CURRENT RATING
E8
GND
CUSTOMER NOTICE
NOTE: UNLESS OTHERWISE SPECIFIED
1. ALL RESISTORS AND CAPACITORS 0603.
2. ALL RESISTORS ARE 1%.
APPROVALS
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
PCB DES.
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
APP ENG.
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
TECHNOLOGY
RB
ANDY R
LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY
TITLE: SCHEMATIC
SIZE
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
N/A
SCALE = NONE
1630 McCarthy Blvd.
Milpitas, CA 95035 www.linear.com
Phone: (408)432-1900
Fax: (408)434-0507
IC NO.
2-STRING, 2MHz STEP-UP LED
DRIVER WITH ±1.8% CURRENT MATCHING
REV.
LT3909EDD
DEMO CIRCUIT 2176A
MODIFY DATE: Jul 29, 2015
2176A_00_REV3
3
SHEET
1
OF
2
R19
R18
0Ω
0805
0Ω
0805
R32
0Ω
0805
R20
0Ω
0805
R31
0Ω
0805
R17
0Ω
0805
R21
0Ω
0805
R30
0Ω
0805
R34
0Ω
0805
R16
0Ω
0805
R22
0Ω
0805
R29
0Ω
0805
R35
0Ω
0805
R15
0Ω
0805
R23
0Ω
0805
R28
0Ω
0805
R36
0Ω
0805
R14
0Ω
0805
R24
0Ω
0805
R27
0Ω
0805
R37
0Ω
0805
R13
0Ω
0805
R25
0Ω
0805
R26
0Ω
0805
R38
0Ω
0805
R40
0Ω
0805
R33
0Ω
0805
R39
0Ω
0805
APPROVALS
TECHNOLOGY
PCB DES.
APP ENG.
LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY
TITLE: SCHEMATIC
SIZE
N/A
SCALE = NONE
1630 McCarthy Blvd.
Milpitas, CA 95035 www.linear.com
Phone: (408)432-1900
Fax: (408)434-0507
2-STRING, 2MHz STEP-UP LED
DRIVER WITH ±1.8% CURRENT MATCHING
IC NO. LT3909EDD
REV.
3
DEMO CIRCUIT 2176A
MODIFY DATE: Jul 29, 2015
SHEET
2
OF
2
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