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LT3743
TYPICAL PERFORMANCE CHARACTERISTICS
120
100
80
60
40
Overcurrent Threshold
CTRL_SEL
5V/DIV
SW
20V/DIV
I LED
5A/DIV
I L
10A/DIV
LED Current Waveforms
(90% PWM) 0.5A to 5A
CTRL_SEL
5V/DIV
I LED
5A/DIV
I L
10A/DIV
LED Current Waveforms
(2000:1) 3A to 10A
20
40μs/DIV
3743 G29
5μs/DIV
3743 G30
0
0
0.75
1.5
2.25
3.0
CTRL_H (V)
3743 G28
CTRL_SEL
5V/DIV
SW
10V/DIV
I LED
11.1A/DIV
LED Current Waveforms
(3000:1) 2A to 20A
CTRL_SEL
5V/DIV
PWM
5V/DIV
SW
10V/DIV
I LED
10A/DIV
LED Current Waveforms
(3000:1) 0A to 2A to 20A
PWM
5V/DIV
CTRL_L
0.2V/DIV
CTRL_SEL
5V/DIV
I LED
8A/DIV
LED Current Waveforms (3000:1)
Analog Dimming on CTRL_L
C OUT(LOW) = 22μF, C OUT(HIGH) = 1mF
20μs/DIV
3743 G31
20μs/DIV
3743 G32
40μs/DIV
3743 G33
V OUT
2V/DIV
I L
5A/DIV
Voltage Regulation with 10A
Regulated Inductor Current
V OUT
2V/DIV
I L
200mA/DIV
Common Mode Lockout (V IN = 7V)
I L
200mA/DIV
V OUT
2V/DIV
Overvoltage Lockout Operation
With Open-Load Condition
100μs/DIV
3743 G34
1ms/DIV
3743 G35
40ms/DIV
3743 G36
3743fd
8
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