LT3517
TYPICAL APPLICATIONS
Boost 100mA LED Driver with LED Open Protection
L1
22μH
D1
V
IN
8V TO 16V
SHDN V
PWM
SW
ISP
IN
PWM
R
SENSE
TGEN
1Ω
LT3517
V
ISN
TG
FB
REF
CTRL
SYNC
M1
C1
2.2μF
C2
2.2μF
R1
LED1
LED2
1M
V
C
R
SS
GND
C1, C2: KEMET C1206C225K2RAC
C3, C4: MURATA GRM21BR71H104KA01B
D1: DIODES DFLS160
L1: COILCRAFT DS3316P-223
LEDS: CREE XLAMP 7090
M1: ZETEX ZXMP6A13FTA
T
R
T
100mA
16.9k
1MHz
R2
30.1k
C4
0.1μF
C3
0.1μF
LED10
3517 TA06a
Efficiency
3000:1 PWM Dimming at 100Hz
90
80
70
60
50
40
30
PWM
5V/DIV
V
= 12V
IN
I
LED
CTRL = V
REF
100mA/DIV
I
L
500mA/DIV
3517 TA06b
1μs/DIV
V
= 12V
IN
f
I
= 1MHz
OSC
LED
= 100mA
20
0
20
40
60
80
100
PWM DUTY CYCLE (%)
3517 TA06c
3517fa
16
Linear [ Linear ]
