LT3518
TYPICAL APPLICATIONS
Boost 300mA LED Driver with LED Open Protection
L1
8.2μH
D1
V
IN
8V TO 16V
SHDN V
PWM
SW
ISP
IN
PWM
R
SENSE
TGEN
330mΩ
LT3518
V
ISN
TG
FB
REF
CTRL
SYNC
M1
C1
2.2μF
C2
6.8μF
R1
LED1
1M
V
C
R
SS
GND
C1: KEMET C1206C225K2RAC
C2: TDK C5750X7R1H685M
C3, C4: MURATA GRM21BR71H104KA01B
D1: ZETEX ZLLS2000TA
T
LED2
R
T
300mA
16.9k
1MHz
R2
30.1k
L1: TOKO B992AS-8R2N
C4
0.1μF
C3
0.1μF
LED8
LEDS: LUXEON I (WHITE)
M1: ZETEX ZXMP6A13GTA
3518 TA06a
3000:1 PWM Dimming at 100Hz
Efficiency
100
90
80
70
60
50
40
30
PWM
5V/DIV
I
LED
200mA/DIV
I
L1
1A/DIV
3518 TA06b
V
= 12V
1μs/DIV
IN
f
I
= 1MHz
OSC
LED
= 300mA
V
= 12V
IN
CTRL = V
REF
20
0
20
40
60
80
100
PWM DUTY CYCLE (%)
3518 TA06c
3518fb
17
Linear [ Linear ]
