LT3492
TYPICAL APPLICATIONS
Triple Buck Mode LED Driver with Open LED Protection
PV IN
48V
ISP1
330mΩ
ISN1
ISP2
330mΩ
ISN2
ISP3
330mΩ
ISN3
C1-C3
1μF
3
TG1
M1
TG2
M2
M3
TG3
80.6k
80.6k
80.6k
10 LEDs
0.3A
10 LEDs
0.3A
10 LEDs
0.3A
C4
C5
C6
5.6k
0.47μF
0.47μF
5.6k
5.6k
0.47μF
M4
M5
M6
OVP1
L1
L2
OVP2 OVP1
L3
2k
22μH
D1
D2
22μH
2k
2k
22μH
D3
SW1
ISP1-3
SW2
SW3
TG1-3
OVP1-3
10k
V IN
5V
C7
1μF
ISN1-3
V IN
PWM1-3
SHDN
LT3492
V C1-3
V REF
CTRL1-3
430k
470pF
C1-C3, C7: MURATA GRM31CR72A105KA01L
GND
FADJ
100k
C4-C6: MURATA GRM21BR72A474KA73
D1-D3: ROHM RB160M-60
L1-L3: TDK VLF5014AT-220MR62
M1-M3: ZETEX ZXMP6A13F
M4-M6: PHILIPS BC858B
3492 TA02
1MHz
2000:1 PWM Dimming at 100Hz
Ef?ciency vs PWM Duty Cycle for 200mA LEDs
95
PWM
5V/DIV
I LED
0.5A/DIV
I L
0.5A/DIV
90
85
80
75
70
1μs/DIV
3492 TA02b
65
60
55
50
0
20
40
60
80
100
PWM DUTY CYCLE (%)
3492 TA02c
3492fa
18
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