Datasheet

LT3517
12
3517fg
For more information www.linear.com/LT3517
Buck Mode 1A LED Driver
2000:1 PWM Dimming at 120Hz
350mA, 5V to 12V Boost Converter with Accurate Input Current Limit
1A
D1
C3
10µF
L1
15µH
C2
2.2µF
C4
0.1µF
R
SENSE
100mΩ
M1
C1
2.2µF
ISP
TGEN GNDV
REF
VC
R
T
16.9k
1MHz
3517 TA02a
C5
0.1µF
C1: KEMET C0805C225K4RAC
C2: MURATA GRM31MR71E225KA93
C3: MURATA GRM32DR71E106KA12B
C4, C5: MURATA GRM21BR71H104KA01B
D1: DIODES DFLS160
L1: TOKO B992AS-150M
LEDS: LUXEON K2 (WHITE)
M1: ZETEX ZXMP6A13FTA
V
IN
SHDN
CTRL
PWM
SYNC
FB
SS
RT
SW
PV
IN
24V
V
IN
3.3V
ISN
LT3517
TG
PWM
V
REF
SW
VC GND SS
V
IN
CTRL
PWM
SHDN
TGEN
V
REF
FB
V
OUT
12V
350mA
V
IN
5V
SYNC
R1
549k
C2
10µF
C3
0.1µF
C4
10nF
SHDN
RT
ISN
LT3517
TGISP
D1
R2
49.9k
R
T
6.04k
2MHz
R3
10k
3517 TA03a
C1
2.2µF
L1
6.8µH
R
SENSE
100mΩ
C1: KEMET C0805C225K4RAC
C2: KEMET C1206C106K4RAC
C3: MURATA GRM21BR71H104KA01B
C4: MURATA GCM033R71A103KA03
D1: ZETEX ZLLS1000TA
L1: TOKO B992AS-6R8N
Efficiency
TYPICAL APPLICATIONS
I
LOAD
(mA)
50
50
EFFICIENCY (%)
60
70
80
90
100 150 200 250
3517 TA03b
300 350
PWM
5V/DIV
I
L
1A/DIV
I
LED
1A/DIV
1µs/DIV
PV
IN
= 24V
f
OSC
= 1MHz
I
LED
= 1A
3517 TA02b