LT3595
TYPICAL PERFORMANCE CHARACTERISTICS
Switching Waveforms
10 LEDS
V
SW1
50V/DIV
10 LEDS
I
L1
50mA/DIV
5 LEDS
V
SW2
50V/DIV
5 LEDS
I
L2
50mA/DIV
V
IN
= 45V
I
LED
= 20mA
PWM Dimming Waveforms
(1000:1)
PWM
5V/DIV
PWM Dimming Waveforms
(10:1)
PWM
5V/DIV
I
L
20mA/DIV
I
LED
20mA/DIV
400ns/DIV
3595 G01
I
L
20mA/DIV
I
LED
20mA/DIV
2μs/DIV
3595 G02
2ms/DIV
3595 G03
V
IN
= 40V
PWM FREQUENCY = 100Hz
10 LEDS AT 20mA T
ON
= 10μs
V
IN
= 40V
PWM FREQUENCY = 100Hz
10 LEDS AT 20mA T
ON
= 1ms
LED Current vs PWM Duty Cycle
Wide Dimming Range (5000:1)
100
V
IN
= 45V
10 LEDS AT 20mA
PWM FREQUENCY = 100Hz
LED CURRENT (mA)
60
50
40
30
20
10
0
LED Current vs R
SET
Resistance
2.0
V
IN
Quiescent Current
T = 125°C
1.6
V
IN
CURRENT (mA)
T = 25°C
T = – 40°C
10
LED CURRENT (mA)
1
1.2
0.1
0.8
0.01
0.4
0.001
0.01
0.1
10
1
DUTY CYCLE (%)
100
3595 G04
0
25
50
75
100
125
R
SET
RESISTANCE (kΩ)
150
3595 G05
0
10
20
30
V
IN
(V)
40
50
3595 G06
V
CC
Quiescent Current
20
18
16
V
CC
CURRENT (mA)
14
12
10
8
6
4
2
0
0
1
2
4
3
V
CC
(V)
5
6
7
3595 F07
⎯
S
⎯
H
⎯
D
⎯
N Pin Bias Current
100
T = 25°C
T = –40°C
I
SHDN
(μA)
80
T = 25°C
60
T = 125°C
40
T = –40°C
V
CC
= 3.3V
T = 125°C
20
0
0
1
2
3
V
SHDN
(V)
4
5
3595 F08
6
3595f
4
LINER [ LINEAR TECHNOLOGY ]
