Datasheet

LT3518
14
3518fe
TYPICAL APPLICATIONS
3000:1 PWM Dimming at 120Hz Effi ciency
Buck-Boost Mode LED Driver
D1
L1
4.3µH
R
SENSE
330m
SHDN
VC GNDRT SS
R
T
6.04k
2MHz
3518 TA04a
C3
0.1µF
C2
4.7µF
R1
3.92M
R2
124k
M1
C5
0.22µF
C1
2.2µF
C4
0.1µF
PWM
ISP
FB
ISN
TG
TGEN
V
REF
CTRL
SYNC
300mA
V
IN
8V TO 16V
V
IN
LT3518
SW
PWM
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
PWM
5V/DIV
I
LED
200mA/DIV
I
L1
1A/DIV
500ns/DIVV
IN
= 10V
f
OSC
= 2MHz
I
LED
= 300mA
3518 TA04b
PWM DUTY CYCLE (%)
0
70
80
90
80
3518 TA04c
60
50
20 40 60 100
40
30
20
EFFICIENCY (%)
V
IN
= 10V
CTRL = V
REF