DC1309A - Schematic

5
3
2
1
D3
CMHZ5239B
2
1
E6
9.1V
D
VIN
1
11
1
GND
GND
GND
Rt
80.6k
1%
500kHz
B
3
E8
14
Q1
OPT
4 1
3
2
1
9
PWM
VC
VADJ
RT
R4
OPT
E7
17
8
15
13
C
LED 3
R3
0
E4
1
OUT 2
REF
R6
100k
0603
D1
B150
DNC
DNC
1210
Q3
MMBT3904
1
LED+
LED-
3
R5
OPT
C
SW 5
SHDN
SUMIDA
CDRH8D28
2
16
COUT
2.2uF,50V
D4
VC
MMSZ5252BS
24V
2
10
SHDN
L1
47uH
8
7
6
5
U1
LT3474EFE-1
2
0603
BOOST 6
R1
20k
BIAS 7
E2
E3
VADJ
CBOOST
0.22uF
CIN
2.2uF,50V
1210
12
GND
E1
VIN 4
VIN
4V - 36V
D
R2
10k
0603
2
BIAS
4
Q2
Si2318DS
OPT
E9
E5
VC
GND
PWM
B
C2
0.1uF
NOTE: UNLESS OTHERWISE SPECIFIED
1. ALL RESISTORS ARE IN OHMS, 0402.
ALL CAPACITORS ARE IN MICROFARADS, 0402.
A
CUSTOMER NOTICE
CONTRACT NO.
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.
5
4
3
APPROVALS
DRAWN:
TECHNOLOGY
KIM T.
CHECKED:
TITLE: SCHEMATIC
DESIGNER:
A
STEP-DOWN 1A LED DRIVER
APPROVED:
ENGINEER: KEITH S.
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
SIZE
A
DATE:
DWG NO.
DC1309A * LT3474EFE-1
Wednesday, January 02, 2008
2
SHEET
1
REV
A
1 OF 1
Similar pages