DC949A - Schematic

3
*** SEE QUICK START GUIDE
R21
C1
4.7uF
25V
TP12
GND
TP13
VIN
2.8V-16V
TP1
36V Transient
SHDN
11
TP4
R2
0
R3
93.1k
GND
CTRL2
TP7
4
VIN
VS
5
L
1
2
SW
SW
OUT
SHDN
OUT
TP2
C2
4.7uF
50V
C21
4.7uF
50V
GND
TP11
6
R11
VREF
CTRL1
3
LED-
OUT
PDS560
C20
opt.
* U1
TP8
D1
L1
10uH
CIN
1uF
25V
R1
100k
2
R4
36.5k
10
*
VREF
13
CTRL2
12
CTRL1
EXPOSED PAD
PWM
SS
VC
14
16
9
TP10
C3
1uF
TP6
C5
opt.
OVPSET
8
GND
RT
PAD1
15
R9
TP5
VREF
LED+
40V max
350mA
OPTIONAL CIRCUIT
24k
17
R10
100k
**
C4
0.1uF
OUT
Vs
R12
opt.
R6
31.6k
1%
1 MHz
D3
opt.
Q3
opt.
B
U2 LT3003EMSE(OPT.)
** LED1
** LED2
** LED3
OUT
E
R8
opt.
R5
opt.
LED
7
LED1
VEE
2
10
LED2
SHDN
9
3
LED3
OT2
8
4
VMAX
OT1
7
5
VIN
PWM
6
C7
opt.
D2
opt.
PWM
15V max
1
GND
SHDN
TP3
3
R22
opt.
R7
10k
SHDN
PAD1
**
PAD2
**
R14 opt.
11
GND
C6
3.3uF
25V
R20
opt.
C
***
Q2
opt.
1
VS
2.8V-25V
36VDC MAX
PWM
1
opt.
2
Vs
Q1
Si2318DS
PWM
PWM
TP9
LED1-LED3, PAD1, AND PAD2 ARE LANDING PADS IN LAYOUT.
** NOTE:
PAD1 LOCATED NEXT TO Vc.
* VERSION TABLE
ASSEMBLY VERSION
U1
R11
DC949A-A
LT3478EFE-1
DO NOT STUFF
DC949A-B
LT3478EFE
0.1 ohm 1%
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.
CONTRACT NO.
APPROVALS
DRAWN
June Wu
DATE
1/9/07
CHECKED
TECHNOLOGY
TITLE
LT3478EFE-1/LT3478EFE
4.5A Boost LED Driver with PWM
APPROVED
ENGINEER Keith Szolusha
1/9/07
DESIGNER
Monday, January 15, 2007
SIZE
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
CAGE CODE
SCALE:
FILENAME:
DWG NO
REV
A
DC949A
SHEET
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