LT3518
TYPICAL APPLICATIONS
Buck Mode 1A LED Driver with Open LED Protection and Sync Input
R
SENSE
M1
100mΩ
PV
IN
32V
C2
2.2μF
R1
LED1
1A
49.9k
C3
10μF
Q1
FB
R2
2.00k
LED6
R3
5.62k
L1
10μH
D1
ISP
ISN TG
V
IN
V
SW
IN
3.3V
C1
2.2μF
SHDN
LT3518
V
FB
CTRL
PWM
FB
REF
C1: KEMET C0806C225K4RAC
C2: MURATA GRM31MR71E225KA93
C3: MURATA GRM32DR71E106KA12B
C4, C5: MURATA GRM21BR71H104KA01B
D1: ZETEX ZLLS2000TA
PWM
SS
SYNC
3.3V, 1.2MHz
SYNC
TGEN V
R
T
GND
V
REF
C4
C
R
16.7k
1MHz
T
C5
L1: TOKO B992AS-100M
0.1μF
LEDS: LUXEON III (WHITE)
M1: ZETEX ZXMP6A13GTA
0.1μF
3518 TA05a
M2: PHILIPS PMBT3906
1000:1 PWM Dimming at 120Hz
Efficiency
100
CTRL = V
REF
PWM
5V/DIV
90
I
LED
1A/DIV
80
70
I
L1
1A/DIV
60
50
40
3518 TA05b
PV = 32V
2μs/DIV
IN
f
I
= 1.2MHz
= 1A
OSC
LED
0
20
40
60
80
100
PWM DUTY CYCLE (%)
3518 TA05c
3518fb
16
Linear [ Linear ]
