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Electrical Specifications
90
5 LEDs
L = 10μH
C OUT = 1.0μF
90
5 LEDs
L = 4.7μH
C OUT = 1.0μF
80
70
60
I LED = 25mA
VIN=2.7V
VIN=3.6V
VIN=4.2V
80
70
60
I LED = 25mA
VIN=2.8V
VIN=3.6V
VIN=4.2V
50
50
5
10
15
20
25
5
10
15
20
25
90
LED Current (mA)
Figure 4. 5 LEDs: Efficiency vs. LED Current
vs. Input Voltage
4 LEDs
L = 10μH
C OUT = 1.0μF
LED Current (mA)
Figure 5. 5 LEDs: Efficiency vs. LED Current
vs. Input Voltage
0.8
0.6
80
I LED = 25mA
0.4
0.2
70
0
60
50
VIN=2.7V
VIN=3.6V
VIN=4.2V
-0.2
-0.4
-0.6
-40°C
+25°C
+85°C
5
10
15
20
25
2.7
3
3.3
3.6
3.9
4.2
LED Current (mA)
Figure 6. 4 LEDs: Efficiency vs. LED Current
vs. Input Voltage
Input Voltage (V)
Figure 7. Delta of V FB Over Input Voltage and
Temperature for 4 LEDs with L=10μH and
C OUT =1.0μF at I LED =25mA
90
3 LEDs
20.0
80
L = 10μH
C OUT = 1.0μF
I LED = 25mA
19.5
4 LEDs
L = 10μH
C OUT = 1.0μF
I LED = 25mA
19.0
70
60
VIN=2.8V
18.5
18.0
50
VIN=3.6V
VIN=4.2V
17.5
17.0
5
10
15
20
25
2.7
3
3.3
3.6
3.9
4.2
LED Current (mA)
Figure 8. 3 LEDs: Efficiency vs. LED Current
vs. Input Voltage
? 2009 Fairchild Semiconductor Corporation
FAN5341 ? Rev. 1.0.1
6
Input Voltage (V)
Figure 9. Over-Voltage Protection vs. Input Voltage
www.fairchildsemi.com
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