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