LT3492
TYPICAL APPLICATIONS
Triple Boost 100mA × 12 LED Driver
PV IN
12V
C1
L1
22μH
D1
2.2μF
3
L2
22μH
D2
L3
22μH
D3
C2
1μF
ISP1
C3
1μF
ISP2
C4
1μF
ISP3
ISN1
ISN2
ISN3
TG1
M1
TG2
M2
TG3
M3
1M
1M
1M
12 LEDs
100mA
OVP1
20k
12 LEDs
100mA
OVP2
20k
12 LEDs
100mA
OVP3
20k
SW1
ISP1-3
SW2
SW3
TG1-3
OVP1-3
18.2k
V IN
5V
C5
1μF
ISN1-3
V IN
PWM1-3
SHDN
LT3492
V C1-3
V REF
CTRL1-3
150k
2.2nF
GND
FADJ
49.9k
C1: MURATA GRM31MR71C225KA35
C2-C4: MURATA GRM31CR72A105KA01L
C5: MURATA GRM31MR71H105KA88
D1-D3: DIODES B1100
L1-L3: TDK VLF5014AT-220MR62
M1-M3: ZETEX ZXMP6A13F
3492 TA03a
1.3MHz
PWM
5V/DIV
I LED
0.1A/DIV
I L
1000:1 PWM Dimming at 100Hz
85
80
75
70
65
Ef?ciency vs PWM Duty Cycle
0.5A/DIV
60
2μs/DIV
3492 TA03b
55
50
0
20
40
60
80
100
PWM DUTY CYCLE (%)
3492 TA03c
3492fa
14
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