LT3518
TYPICAL APPLICATIONS
Buck Mode 1.5A LED Driver
C3
10μF
R
SENSE
M1
68mΩ
1000:1 PWM Dimming at 120Hz
PV
IN
24V
C2
2.2μF
L1
1.5A
15μH
PWM
5V/DIV
D1
ISP
ISN TG
V
IN
V
SW
IN
3.3V
C1
2.2μF
I
SHDN
LED
1A/DIV
LT3518
V
CTRL
PWM
SYNC
FB
REF
I
L
PWM
SS
1A/DIV
3518 TA02b
R
T
PV = 24V
2μs/DIV
IN
TGEN V
V
GND
f
I
= 1MHz
= 1.5A
REF
C4
C
OSC
LED
R
T
C5
0.1μF
16.9k
1MHz
0.1μF
3518 TA02a
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
500mA, 5V to 12V Boost Converter with Accurate Input Current Limit
R
L1
Efficiency
SENSE
D1
50m7 4.3MH
V
OUT
V
IN
12V
90
80
70
60
50
5V
500mA
C2
2.2MF
R1
549k
ISP TG ISN
SW
FB
V
IN
CTRL
PWM
SHDN
TGEN
C2
10MF
LT3518
GND
SHDN
SYNC
R2
49.9k
V
R
T
REF
V
C
SS
R3
10k
C4
10nF
R
6.04k
2MHz
T
C3
0.1MF
0
100
200
300
(mA)
400
500
I
LOAD
3518 TA03b
3518 TA03a
C1: KEMET C0805C225K4RAC
C2: KEMET C1206C106K4RAC
C3: MURATA GRM21BR71H104KA01B
C4: MURATA GCM033R71A103KA03
D1: ZETEX ZLLS2000TA
L1: TOKO B992AS-4R3N
3518fb
14
Linear [ Linear ]
