LT3003
TYPICAL APPLICATIONS
330mA Boost LT3003 with the LT3477
V IN
8V TO 16V
C1
1 μ F
25V
1
10
9
13 14
I SP1 I SN1
V IN
I ADJ1
I ADJ2
L1
4.7 μ H
16 17
SW SW
FBN
NC
NC
NC
6
18
19
20
D1
R5
1.15M
1%
R6
45.3k
1%
C4
4.7 μ F
50V
V OUT
3
SHDN
LT3477
I SP2
11
R4
0.3 ?
D2
1N4148W
7
8
5
FBP
V REF
V C
GND
GND
SS
I SN2
R T
12
2
R3
6.81k
1%
I LED
110mA PER STRING
6 to 8
LEDs PER STRING
Q1
15
21
4
PWM
2N7002
C2
22nF
C3
0.033 μ F
6
3
LED1
PWM
2
LED2
1
LED3
V MAX
4
V OUT
V IN
C1, C3: TAIYO YUDEN TMK212BJ105MG-BR
C4: MURATA GRM32ER71H475KA88L
D1: DIODES INC. DFLS140
L1: SUMIDA CDRH5D16-4R7
7
OT1
LT3003
V IN
5
4V
C3
1 μ F
25V
8
OT2
GND
11
V EE
10
SHDN
9
3003 TA03a
PWM Dimming
Ef?ciency
1000
100
10
1
I LED = 110mA PER STRING
NUMBER OF LEDS = 8 × 3 = 24
100
I LED = 110mA PER STRING
95 NUMBER OF LEDS = 8 × 3 = 24
90
85
80
75
70
65
60
55
0.1
1
10
100
1000
10000
50
8
9
10
11
12
13
14
15
16
PWM DIMMING RATIO
3003 TA03b
V IN (V)
3003 TA03b
3003fa
11
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