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LT3492
TYPICAL APPLICATIONS
Triple LED Driver Driving LED Strings in Buck, Boost and Buck-Boost Modes
V IN
10V TO 16V
C1
3.3μF
ISP1
L2
L3
3
330mΩ
22μH
33μH
4 LEDs
0.1A
ISN1
TG1
M1
C3
1μF
D2
ISP2
1Ω
TG3
M3
ISN2
ISN3
2 LEDs
0.3A
TG2
M2
ISP3
1Ω
3.9M
C2
0.47μF
825k
D3
OVP3
100k
L1
10 LEDs
0.1A
OVP2
20k
C4
0.1μF
C5
1μF
6.8μH
D1
V IN
ISP1-3
ISN1-3
V IN
PWM1-3
SHDN
SW1
SW2
LT3492
SW3
TG1-3
OVP2-3
V C1-3
V REF
CTRL1-3
150k
18.2k
FADJ
49.9k
1.3MHz
2.2nF
C1: MURATA GRM55DR71H335KA0193
C2: MURATA GRM21BR71H474KA88
C3, C5: MURATA GRM31MR71H105KA88
C4: MURATA GRM21BR71H104KA01B
D1: DIODES DFLS130
D2, D3: ROHM RB160M-60
GND
L1: TDK VLF5014AT-6R8MR99
L2: TDK VLF5014AT-229MR62
L3: TDK VLF5014AT-330MR50
M1: ZETEX ZXMP3A13F
M2, M3 ZETEX ZXMP6A13F
OVP1
3492 TA05
3000:1 PWM Dimming at 100Hz for CH1 (Buck Mode)
PWM
5V/DIV
I LED
0.5A/DIV
I L
0.5A/DIV
3000:1 PWM Dimming at 100Hz for CH2 (Boost Mode)
PWM
5V/DIV
I LED
0.1A/DIV
I L
0.5A/DIV
1μs/DIV
3492 TA05b
1μs/DIV
3492 TA05c
3000:1 PWM Dimming at 100Hz for CH3 (Buck-Boost Mode)
PWM
5V/DIV
I LED
0.1A/DIV
I L
0.5A/DIV
1μs/DIV
3492 TA05d
3492fa
17
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