LT3518 LINER [Linear Technology], LT3518 Datasheet - Page 16

• Manufacturer Part Number: LT3518
• Description: Full-Featured LED Driver with 2.3A Switch Current
• Manufacturer: LINER [Linear Technology]

LT3518
TYPICAL APPLICATIONS
16
5V/DIV
1A/DIV
1A/DIV
PWM
I
LED
I
L1
PV
f
I
OSC
LED
IN
= 1.2MHz
= 1A
= 32V
1000:1 PWM Dimming at 120Hz
PV
3.3V
32V
V
IN
IN
2.2μF
SYNC
PWM
V
3.3V, 1.2MHz
REF
C1
2μs/DIV
Buck Mode 1A LED Driver with Open LED Protection and Sync Input
C2
2.2μF
V
SHDN
CTRL
PWM
SYNC
TGEN
IN
ISP
R
100mΩ
0.1μF
SENSE
V
3518 TA05b
LT3518
REF
C4
ISN
V
C
M1
TG
GND
SW
SS
R
FB
LED1
LED6
T
1A
FB
R
16.7k
1MHz
5.62k
T
L1
10μH
R3
3518 TA05a
C5
0.1μF
D1
Q1
R1
49.9k
R2
2.00k
FB
C1: KEMET C0806C225K4RAC
C2: MURATA GRM31MR71E225KA93
C3: MURATA GRM32DR71E106KA12B
C4, C5: MURATA GRM21BR71H104KA01B
D1: ZETEX ZLLS2000TA
L1: TOKO B992AS-100M
LEDS: LUXEON III (WHITE)
M1: ZETEX ZXMP6A13GTA
M2: PHILIPS PMBT3906
100
90
80
70
60
50
40
C3
10μF
0
CTRL = V
20
REF
PWM DUTY CYCLE (%)
Effi ciency
40
60
80
3518 TA05c
100
3518fb