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DC923A
P1-P3
P4-P6
P7-P7
QUICK ST
ART GUID
E FOR DEMONSTRA
TION CIRC
UIT 923
D
U
A
L
S
T
E
P
-
D
OW
N
1.
5
A
L
E
D
D
R
I
V
E
R
4
Figu
re 4
. E
xte
nde
d Di
m
min
g R
ang
e Co
mp
on
ent
s
Q3,
R1
3, a
nd
C7
1.0M
R13
WHITE
Si23
12B
DS
220
pF
C7
330
0pF
2N7
002
Q3
REF
10k
1N4448W
20k
330
0pF
Si23
12B
DS
CIN
4.7uF
50V
0.1uF
1.5A
REF
B240A
PWM
2
0.1uF
0.22uF
10k
COUT1
2.2uF
RT
24.3
k
SHD
N
B240A
VIN
5V-
36V
1.5A
10k
Ext
ende
d Dimmin
g Ran
ge
LT3475EFE
VIN
VIN
SHDN
GND
PWM1
BOOST1
OUT1
SW1
LED1
REF
VADJ1
VC1
PWM2
BOOST2
OUT2
SW2
LED2
VADJ2
VC2
GND
RT
0.22uF
WHITE
100Hz
1200:1
10k
100Hz
1200:1
10u
H
Sumida 8D28
1N4448W
PWM
1
600
kHz
10u
H
Sumida 8D28
COUT2
2.2uF
QUICK ST
ART GUID
E FOR DEMONSTRA
TION CIRC
UIT 923
D
U
A
L
S
T
E
P
-
D
OW
N
1.
5
A
L
E
D
D
R
I
V
E
R
5
Figure 5. Single Red LED Driver With Alt
ernate Boost S
upply From VIN
R
EF
5.
1V
CM
HZ
5231
L
T
3
4
7
5
EF
E
V
I
N
V
I
N
SH
D
N
G
N
D
P
W
M
1
B
O
O
S
T1
O
U
T1
S
W
1
L
E
D
1
R
E
F
V
A
D
J
1
V
C
1
PW
M
2
B
O
O
S
T2
O
U
T2
S
W
2
L
ED
2
V
A
D
J
2
VC
2
G
N
D
R
T
C
O
U
T2
2.
2uF
M
MS
D4
148
0.
1uF
2222A
600kHz
1
.5
A
0.22
u
F
CM
HZ
5231
V
I
N
4V
-36V
*
4V
Bo
o
st
from
V
I
N
O
ver
W
i
d
e
V
I
N
Ran
g
e
Red
V
f fro
m
2.
2V
to
3.
2V
2222A
R
EF
B2
4
0A
RE
D
1
.5
A
C
O
U
T1
2.
2u
F
B2
4
0A
R
T
24.
3k
CIN
4.
7uF
50V
10uH
Su
m
i
d
a
8
D
28
S
HDN
10uH
Su
m
i
d
a
8
D
28
20
k
0.22
u
F
5.
1V
RE
D
3k
0.
1uF
MM
SD4
14
8
3k
QUICK ST
ART GUID
E FOR DEMONSTRA
TION CIRC
UIT 923
D
U
A
L
S
T
E
P
-
D
OW
N
1.
5
A
L
E
D
D
R
I
V
E
R
6
Figu
re 6
. LE
D
strin
g
s up
to
13
.5V
req
uir
e la
rge
r in
du
ctor
s to
a
void
sub
ha
rmo
nic
o
scill
ation
s
at h
igh
du
ty c
ycl
es.
SHDN
WHITE
RED
0.22uF
CIN
4.7uF
50V
0.22uF
Higher String V
oltage Must
Remain Under 13.5V
REF
RT
24.3k
COUT2
2.2uF
1.5A
20k
1N4448
W
COUT1
2.2uF
B240A
Bigger L for High
er LED String
Voltage
WHITE
15uH
Sumida 104R
1N4448
W
VIN
8V-36V
15uH
Sumida 104R
600kHz
0.1uF
0.1uF
RED
B240A
1.5A
REF
LT347
5EFE
VIN
VIN
SHDN
GND
PWM1
BOOST1
OUT1
SW1
LED1
REF
VADJ1
VC1
PWM2
BOOST2
OUT2
SW2
LED2
VADJ2
VC2
GND
RT
P1-P3
P4-P6
P7-P7
DC923A
Mfr. #:
Buy DC923A
Manufacturer:
Analog Devices Inc.
Description:
LED Lighting Development Tools LT3475 Demo board
Lifecycle:
New from this manufacturer.
Delivery:
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DC923A
