LT3492IUFD-PBF データシートの表示（PDF） - Linear Technology
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LT3492IUFD-PBF Datasheet PDF : 20 Pages
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TYPICAL APPLICATIONS
Triple Buck Mode LED Driver with Open LED Protection
PVIN
48V
ISP1
330mΩ
ISN1
ISP2
330mΩ
ISN2
TG1
M1
TG2
M2
ISP3
330mΩ
ISN3
M3
TG3
80.6k
10 LEDs
5.6k
M4
OVP1
L1
2k 22μH
0.3A
10 LEDs
C4
C5
0.47μF 0.47μF
D1
D2
80.6k
0.3A
80.6k
10 LEDs
5.6k
L2
22μH
5.6k
M5
M6
OVP2 OVP1
2k
L3
2k 22μH
0.3A
C6
0.47μF
D3
LT3492
C1-C3
1μF
s3
VIN
5V
C7
1μF
SW1
ISP1-3
ISN1-3
VIN
PWM1-3
SHDN
SW2
LT3492
GND
C1-C3, C7: MURATA GRM31CR72A105KA01L
C4-C6: MURATA GRM21BR72A474KA73
D1-D3: ROHM RB160M-60
L1-L3: TDK VLF5014AT-220MR62
M1-M3: ZETEX ZXMP6A13F
M4-M6: PHILIPS BC858B
SW3 TG1-3
OVP1-3
VC1-3
VREF
CTRL1-3
FADJ
3492 TA02
10k
430k
100k
1MHz
470pF
2000:1 PWM Dimming at 100Hz
PWM
5V/DIV
ILED
0.5A/DIV
IL
0.5A/DIV
1μs/DIV
3492 TA02b
Efficiency vs PWM Duty Cycle for 200mA LEDs
95
90
85
80
75
70
65
60
55
50
0
20
40
60
80 100
PWM DUTY CYCLE (%)
3492 TA02c
3492f
17
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