LT3492
TYPICAL APPLICATIONS
Dual Boost 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
M1
1M
M2
1M
12 LEDs
SW1 TG1
100mA
OVP1
20k
SW2
SW3 TG2
12 LEDs
OVP1-3
200mA
OVP2-3
20k
ISP1-3
TG3
OPEN 18.2k
V IN
3V TO 12V
C5
1μF
ISN1-3
V IN
PWM1-3
SHDN
LT3492
V C1-3
V REF
CTRL1-3
150k
2.2nF
C1: MURATA GRM31MR71C225KA35
GND
FADJ
49.9k
C2-C4: MURATA GRM31CR72A105KA01L
C5: MURATA GRM31MR71H105KA88
D1-D3: DIODES B1100
L1-L3: TDK VLF5014AT-220MR62
M1, M2: ZETEX ZXMP6A13F
3492 TA04
1.3MHz
1000:1 PWM Dimming at 100Hz for 200mA LEDs
Ef?ciency vs PWM Duty Cycle for 200mA LEDs
85
PWM
5V/DIV
I LED
0.2A/DIV
80
75
70
I L2
I L3
0.5A/DIV
65
2μs/DIV
3492 TA04b
60
55
50
0
20
40
60
80
100
PWM DUTY CYCLE (%)
3492 TA04c
3492fa
15
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