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LT3475/LT3475-1
TYPICAL APPLICATIONS
Dual Step-Down 1A LED Driver
V IN
5V TO 36V
C1
4.7 μ F
D3
50V
V IN
SHDN
D4
C4
BOOST1
BOOST2
C3
L2
10 μ H
0.22 μ F
6.3V
LT3475
0.22 μ F
6.3V
L1
10 μ H
D1
SW1
SW2
D2
C5
OUT1
OUT2
C2
2.2 μ F
6.3V
LED 1
C6
LED1
V C1
LED2
V C2
LED 2
C7
2.2 μ F
6.3V
0.1 μ F
R2
REF
R T
0.1 μ F
C1 TO C5: X5R OR X7R
R3
2k
1k
V ADJ1
GND
V ADJ2
R1
24.3k
f SW = 600kHz
3475 TA02
D1, D2: DFLS140
D3, D4: MBR0540
LED CURRENT = 1A
Dual Step-Down 1.5A LED Driver with 1200 : 1 True Color PWM Dimming
V IN
6V TO 36V
C1
4.7 μ F
D3
50V
V IN
SHDN
D4
C2
BOOST1
BOOST2
C3
L2
10 μ H
0.22 μ F
6.3V
LT3475
0.22 μ F
6.3V
L1
10 μ H
C4
SW1
SW2
C5
2.2 μ F
6.3V
D1
OUT1
LED1
OUT2
LED2
D2
2.2 μ F
6.3V
1.5A LED
CURRENT
LED 1
PWM1
V C1
PWM2
V C2
LED 2
1.5A LED
CURRENT
R3
10k
C6
3.3nF
REF
R T
C7
3.3nF
R4
10k
V ADJ1
V ADJ2
M1
C8
0.1 μ F
GND
C9
0.1 μ F
M2
M3
C8
220p
1M
R2
R1
24.3k
PWM1
f SW = 600kHz
3475 TA03
PWM2
D1, D2: B260
D3, D4: MBR0540
C1 TO C5: X5R OR X7R
M1, M2: Si2302ADS
M3: 2n7002L
3475fb
16
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