LT3518
TYPICAL APPLICATIONS
Buck-Boost Mode LED Driver
L1
4.3μH
D1
V
IN
8V TO 16V
C5
0.22μF
R1
3.92M
SHDN
V
IN
SW
FB
R2
124k
300mA
PWM
PWM
TGEN
ISP
LT3518
R
SENSE
330mΩ
V
REF
ISN
TG
CTRL
SYNC
C1
2.2μF
C2
4.7μF
M1
V
R
SS
T
GND
C
R
T
6.04k
2MHz
C4
0.1μF
C3
0.1μF
3518 TA04a
C1: KEMET C0806C225K4RAC
C2: KEMET C1206C475K3RAC
C3, C4: MURATA GRM21BR71H104KA01B
C5: MURATA GRM21BR71H224KA01B
D1: ZETEX ZLLS2000TA
L1: TOKO B992AS-4R3N
LEDS: LUXEON I (WHITE)
M1: ZETEX ZXMP6A13GTA
3000:1 PWM Dimming at 120Hz
Efficiency
90
V
= 10V
PWM
5V/DIV
IN
CTRL = V
REF
80
I
LED
200mA/DIV
70
60
50
40
30
20
I
L1
1A/DIV
3518 TA04b
V
= 10V
500ns/DIV
IN
f
I
= 2MHz
OSC
LED
= 300mA
20
40
60
100
0
80
PWM DUTY CYCLE (%)
3518 TA04c
3518fb
15
Linear [ Linear ]
