EUP2539
Typical Operating Characteristics (continued)
LED Current Regulation (10mA)
Efficiency vs. Load Current (10 LED)
100
1
90
80
70
60
0.5
0
-0.5
-1
VIN=3.6V
VIN=5V
3
3.5
4
4.5
5
5.5
5
10
15
20
25
30
LED Current mA
（
）
Input Voltage (V)
Efficiency vs. Input Voltage (10LED)
Switch On Resistance vs. Input Voltage
100
2
90
80
70
60
1.5
1
0.5
0
ILED=15mA
ILED=20mA
3
3.5
4
4.5
5
5.5
3
3.5
4
4.5
5
5.5
Input Voltage
V
（ ）
Input Voltage (V)
Maximum Output Current vs. Input Voltage
120
Shutdown Voltage vs. Input Voltage
1
100
80
60
40
20
0
0.8
0.6
0.4
0.2
-40
-25
85
℃
℃
℃
125
℃
3
3.5
4
4.5
5
5.5
3
3.5
4
4.5
5
Input Voltage (V)
Input Voltage (V)
DS2539 Ver1.1 Apr. 2009
6
EUTECH [ EUTECH MICROELECTRONICS INC ]
