Datasheet

LT3474/LT3474-1
18
3474fd
V
IN
BIAS
OUT
LED
PWM
LED1
LT3474
C4
0.1μF
V
IN
12V TO
36V
C2
2.2μF
10V
1A
LED
CURRENT
C3
0.22μF
10V
D1
L1
10μH
3474 TA02
R1
33.2k
SHDN
REF
BOOST
SW
V
ADJ
R
T
V
C
GND
C1
2.2μF
50V
LED2
D1: MBRM 140
C1 TO C3: X5R OR X7R
LED CURRENT (mA)
0
EFFICIENCY (%)
70
75
80
600
1000
3474 G01
65
60
55
200 400 800
85
90
95
V
IN
= 12V
V
IN
= 24V
V
IN
BIAS
OUT
PWM
LED
LED1
M1
D1
LT3474
C4
3.3nF
V
IN
6V TO 36V
C2
2.2μF
6.3V
C3
0.22μF
6.3V
L1
10μH
3474 TA01
R1
80.6k
R2
10k
C5
0.1μF
PWM
SHDN
REF
BOOST
SW
V
ADJ
R
T
V
C
GND
C1
2.2μF
50V
D1: B140HB
C1 TO C3: X5R OR X7R
M1: Si2302ADS
I
LED1
500mA/DIV
V(PWM)
5V/DIV
1ms/DIV
Effi ciency, Two LED Output
LED Current in PWM Mode
Step-Down 1A LED Driver with PWM Dimming
Step-Down 1A LED Driver with
Two Series Connected LED Output
TYPICAL APPLICATIONS