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LT3598
TYPICAL PERFORMANCE CHARACTERISTICS
100
10
1
0.1
0.01
LED Current vs PWM Duty Cycle
20.3
20.2
20.1
20.0
19.9
19.8
LED Current vs Temperature
25
20
15
10
5
LED Current vs CTRL Voltage
0.001
0.01
0.1
1 10
100
19.7
–50
–25
0
25
50
75
100
125
0
0
0.2
0.4
0.6
0.8
1.0
1.2
1.5
1.0
0.5
0.0
–0.5
PWM DUTY CYCLE (%)
LED Current Matching
vs Temperature
3598 G10
3.0
2.5
2.0
1.5
1.0
TEMPERATURE (°C)
OPENLED Sink Current
3598 G11
PWM
5V/DIV
SW
20V/DIV
I L
1A/DIV
I LED1
50mA/DIV
CTRL VOLTAGE (V)
LED Current Waveforms
(0.1% PWM)
3598 G12
–1.0
0.5
20μs/DIV
3598 G15
–1.5
–50
–25
0
25
50
75
100
125
0
–50
–25
0
25
50
75
100
125
TEMPERATURE (°C)
3598 G13
TEMPERATURE (°C)
3598 G14
PWM
5V/DIV
SW
20V/DIV
I L
1A/DIV
I LED1
50mA/DIV
LED Current Waveforms
(0.1% PWM)
PWM
5V/DIV
SW
20V/DIV
I L
1A/DIV
I LED1
50mA/DIV
LED Current Waveforms
(90% PWM)
PWM
5V/DIV
SW
20V/DIV
I L
1A/DIV
I LED1
50mA/DIV
LED Current Waveforms
(90% PWM)
2μs/DIV
3598 G16
100μs/DIV
3598 G17
5μs/DIV
3598 G18
3598fb
6
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