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LT3595A
TYPICAL PERFORMANCE CHARACTERISTICS T A = 25°C, unless otherwise noted.
PWM Dimming Waveforms
PWM Dimming Waveforms
10 LEDS
V SW1
50V/DIV
10 LEDS
I L1
50mA/DIV
5 LEDS
V SW2
50V/DIV
5 LEDS
I L2
Switching Waveforms
PWM
5V/DIV
I L
20mA/DIV
I LED
20mA/DIV
(1000:1)
PWM
5V/DIV
I L
20mA/DIV
I LED
20mA/DIV
(10:1)
50mA/DIV
400ns/DIV
3595A G01
2μs/DIV
3595A G02
2ms/DIV
3595A G03
V IN = 45V
I LED = 20mA
LED Current vs PWM Duty Cycle
Wide Dimming Range (5000:1)
V IN = 40V PWM FREQUENCY = 100Hz
10 LEDS AT 20mA t ON = 10μs
LED Current vs R SET Resistance
V IN = 40V PWM FREQUENCY = 100Hz
10 LEDS AT 20mA t ON = 1ms
V IN Quiescent Current
100
V IN = 45V
60
2.0
10
10 LEDS AT 20mA
PWM FREQUENCY = 100Hz
50
1.6
T = 125°C
T = 25°C
1
0.1
40
30
20
1.2
0.8
T = –40°C
0.01
10
0.4
0.001
0.01
0.1
1
10
100
0
25
50
75 100 125
150
0
0
10
20
30
40
50
DUTY CYCLE (%)
3595A G04
V CC Quiescent Current
R SET RESISTANCE (kΩ)
3595A G05
SHDN Pin Bias Current
V IN (V)
3595A G06
20
18
16
14
V CC = 3.3V
T = 125°C
T = 25°C
T = –40°C
100
80
T = 25°C
12
60
10
8
40
T = 125°C
T = –40°C
6
4
2
20
0
0
1
2
3
4
5
6
7
0
0
1
2
3 4
5
6
V CC (V)
3595A F07
SHDN (V)
3595A F08
3595af
4
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