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LT3590
TYPICAL PERFORMANCE CHARACTERISTICS
Switch Saturation Voltage
Shutdown Quiescent
0.8
(V CESAT )
1.2
Schottky Forward Voltage Drop
20
Current vs V IN
V CTRL = 0V
0.7
–40°C
1.1
1.0
–40°C
25° C
18
T A = 25°C
0.6
0.9
16
0.5
25° C
125°C
0.8
0.7
125°C
14
0.4
0.6
0.3
0.5
12
0.2
20
40
60
80
100
0.4
0
50
100
150
200
10
0
10
20
30
40
50
60
SWITCH CURRENT (mA)
Shutdown Quiescent Current
vs Temperature
3590 G01
SCHOTTKY FORWARD CURRENT (mA)
3590 G02
Quiescent Current
V IN (V)
Schottky Leakage Current
3590 G03
20
18
V CTRL = 0V
V IN = 48V
600
550
V CTRL = 3.3V
T A = 25°C
2.0
1.5
16
500
1.0
V IN = 48V
14
V IN = 24V
12
450
0.5
V IN = 4.5V
10
–50 –25
0
25
50
75
100
125
400
0
10
20
30
40
50
60
0
–50 –25
0
25
50
75
100
125
TEMPERATURE (°C)
3590 G04
Switching Waveform
I L
20mA/DIV
V SW
20V/DIV
V IN (V)
CTRL
5V/DIV
V SW
50V/DIV
I L
50mA/DIV
I LED
3590 G05
Transient Response
TEMPERATURE (°C)
3590 G06
V IN = 48V
I LED = 50mA
10 WHITE LEDs
1μs/DIV
3590 G07
50mA/DIV
V IN = 48V
I LED = 50mA
10 BLUE LEDs
40μs/DIV
3590 G08
L = 470μH (COILCRAFT)
3590f
4
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