LT3517
TYPICAL APPLICATIONS
Buck Mode 1A LED Driver
2000:1 PWM Dimming at 120Hz
C3
10μF
R
SENSE
M1
100mΩ
PV
IN
24V
C2
2.2μF
L1
15μH
PWM
1A
5V/DIV
D1
ISP
ISN TG
V
I
IN
LED
V
SW
IN
3.3V
1A/DIV
C1
2.2μF
SHDN
LT3517
V
I
CTRL
PWM
FB
REF
L
1A/DIV
PWM
SS
3517 TA02b
1μs/DIV
SYNC
TGEN V
R
T
GND
PV = 24V
V
C
IN
REF
C4
f
I
= 1MHz
= 1A
R
16.9k
1MHz
OSC
LED
T
C5
0.1μF
0.1μF
3517 TA02a
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
350mA, 5V to 12V Boost Converter with Accurate Input Current Limit
R
L1
SENSE
Efficiency
D1
100mΩ 6.8μH
V
OUT
V
IN
12V
90
5V
350mA
C1
2.2μF
R1
549k
80
70
60
50
ISP TG ISN
SW
FB
V
IN
CTRL
PWM
SHDN
TGEN
C2
10μF
LT3517
GND
SHDN
SYNC
R2
V
49.9k
R
T
REF
V
C
SS
R3
10k
C4
10nF
R
6.04k
2MHz
T
C3
0.1μF
50
100
150
200
(mA)
250
300
350
I
LOAD
3517 TA03b
3517 TA03a
C1: KEMET C0805C225K4RAC
C2: KEMET C1206C106K4RAC
C3: MURATA GRM21BR71H104KA01B
C4: MURATA GCM033R71A103KA03
D1: ZETEX ZLLS1000TA
L1: TOKO B992AS-6R8N
3517fa
13
Linear [ Linear ]
