LT3590
TYPICAL PERFORMANCE CHARACTERISTICS
Sense Voltage (VIN – VLED
)
Switching Current Limit
vs Duty Cycle
Switching Current Limit
vs Temperature
vs VCTRL
150
140
130
120
110
100
90
150
140
130
0.25
0.20
0.15
0.10
0.05
0
V
= 48V
T = 25°C
A
IN
I
= 50mA
LED
T
= 25°C
A
120
110
100
90
80
80
–25
0
50
75 100 125
–50
25
20
40
60
100
1
0
80
0
0.5
2
1.5
TEMPERATURE (°C)
DUTY CYCLE (ꢀ)
V
(V)
CTRL
3590 G11
3590 G10
3590 G09
Sense Voltage (VIN – VLED
)
Sense Voltage (VIN – VLED
)
Switching Frequency over
Temperature
vs VIN
vs Temperature
206
204
202
200
198
196
194
206
204
202
1000
950
900
850
800
750
700
I
= 50mA
V
= 48V
IN
LED
10 WHITE LEDs
= 25°C
T
A
200
198
196
194
40
60
–25
0
50
75 100 125
0
10
20
30
(V)
50
–25
0
50
75 100 125
–50
25
–50
25
V
TEMPERATURE (°C)
TEMPERATURE (°C)
IN
3590 G14
3590 G13
3590 G12
Internal Regulator
Line Regulation
Internal Regulator
Load Regulation
Internal Regulator
VREG vs Temperature
3.40
3.35
3.30
3.25
3.20
3.40
3.35
3.30
3.25
3.20
3.40
3.35
3.30
3.25
T
= 25°C
V
I
= 3.3V
= 1mA
T
= 25°C
A
CTRL
LOAD
A
V
= 0V
= 0V
CTRL
LOAD
I
V
LED
= 0V
CTRL
I
= 0V
V
I
= 3.3V
V
I
= 3.3V
= 1mA
CTRL
LED
CTRL
LOAD
= 50mA
3.20
–50 –25
0
25
50
75 100 125
40
50
60
0.8
1
0
10
20
30
(V)
0
0.2
0.4
I
LOAD
0.6
(mA)
TEMPERATURE (°C)
V
IN
3590 G15
3590 G16
3590 G17
3590f
5
Linear [ Linear ]
