Datasheet

LT3518
13
3518fe
TYPICAL APPLICATIONS
Buck Mode 1.5A LED Driver
1000:1 PWM Dimming at 120Hz
500mA, 5V to 12V Boost Converter with Accurate Input Current Limit
Effi ciency
1.5A
D1
C3
10µF
L1
15µH
C2
2.2µF
C4
0.1µF
R
SENSE
68m
M1
C1
2.2µF
ISP
TGEN GNDV
REF
VC
R
T
16.9k
1MHz
3518 TA02a
C5
0.1µF
C1: KEMET C0805C225K4RAC
C2: MURATA GRM31MR71E225KA93
C3: MURATA GRM32DR71E106KA12B
C4, C5: MURATA GRM21BR71H104KA01B
D1: ZETEX ZLLS2000TA
L1: TOKO B992AS-150M
LEDS: LUXEON K2 (WHITE)
M1: ZETEX ZXMP6A13GTA
V
IN
SHDN
CTRL
PWM
SYNC
FB
SS
RT
SW
PV
IN
24V
V
IN
3.3V
ISN
LT3518
TG
PWM
V
REF
PWM
5V/DIV
I
LED
1A/DIV
I
L
1A/DIV
2µs/DIVPV
IN
= 24V
f
OSC
= 1MHz
I
LED
= 1.5A
3518 TA02b
SW
VC GND SS
V
IN
CTRL
PWM
SHDN
TGEN
V
REF
FB
V
OUT
12V
500mA
V
IN
5V
SYNC
R1
549k
C2
10µF
C3
0.1µF
C4
10nF
SHDN
RT
ISN
LT3518
TGISP
D1
R2
49.9k
R
T
6.04k
2MHz
R3
10k
3518 TA03a
C2
2.2µF
L1
4.3µH
R
SENSE
50m1
C1: KEMET C0805C225K4RAC
C2: KEMET C1206C106K4RAC
C3: MURATA GRM21BR71H104KA01B
C4: MURATA GCM033R71A103KA03
D1: ZETEX ZLLS2000TA
L1: TOKO B992AS-4R3N
I
LOAD
(mA)
0
EFFICIENCY (%)
70
80
400
3518 TA03b
60
50
100
200
300
500
90