Datasheet

LT3590
5
3590f
TYPICAL PERFORMANCE CHARACTERISTICS
Sense Voltage (V
IN
– V
LED
)
vs V
CTRL
Switching Current Limit
vs Duty Cycle
Switching Current Limit
vs Temperature
Sense Voltage (V
IN
– V
LED
)
vs V
IN
Sense Voltage (V
IN
– V
LED
)
vs Temperature
Switching Frequency over
Temperature
Internal Regulator
Line Regulation
Internal Regulator
Load Regulation
Internal Regulator
V
REG
vs Temperature
V
CTRL
(V)
0
SENSE VOLTAGE (V
IN
-V
LED
)
0.20
2
0.15
0.10
0
0.5
1
1.5
0.05
0.25
3590 G09
V
IN
= 48V
I
LED
= 50mA
T
A
= 25°C
DUTY CYCLE (%)
0
120
130
140
80
110
100
20 40 60 100
90
80
150
SWITCHING CURRENT LIMIT (mA)
3590 G10
T
A
= 25°C
TEMPERATURE (°C)
–50
SWITCHING CURRENT LIMIT (mA)
25
110
90
–25 0 50
80
150
140
130
120
100
75 100 125
3590 G11
V
IN
(V)
0
206
204
202
200
198
196
194
30 50
10 20
40 60
V
IN
-V
LED
(mV)
3590 G12
I
LED
= 50mA
10 WHITE LEDs
T
A
= 25°C
TEMPERATURE (°C)
–50
V
IN
-V
LED
(mV)
206
25
200
196
–25 0 50
194
204
202
198
75 100 125
3590 G13
TEMPERATURE (°C)
–50
SWITCHING FREQUENCY (KHz)
25
900
800
–25 0 50
750
700
1000
950
850
75 100 125
3590 G14
V
IN
= 48V
V
IN
(V)
0
3.40
3.35
3.30
3.25
3.20
30
10 20
40 6050
V
REG
(V)
3590 G15
V
CTRL
= 3.3V
I
LOAD
= 1mA
V
CTRL
= 0V
I
LOAD
= 0V
T
A
= 25°C
I
LOAD
(mA)
0
3.40
3.35
3.30
3.25
3.20
0.6
0.2 0.4
0.8 1
V
REG
(V)
3590 G16
V
CTRL
= 0V
I
LED
= 0V
V
CTRL
= 3.3V
I
LED
= 50mA
T
A
= 25°C
TEMPERATURE (°C)
–50
3.20
T
REG
(V)
3.25
3.30
3.35
3.40
–25 0 25 50
3590 G17
75 100 125
V
CTRL
= 3.3V
I
LOAD
= 1mA