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Typical Characteristics
V IN = 3.6V, T A = 25 ° C, I LED = 25mA, L = 10μH, C OUT = 1.0μF, and C IN = 10.0μF.
90%
80%
70%
VIN=2.5V
90%
80%
70%
VIN=2.5V
60%
VIN=2.7V
VIN=3.6V
60%
VIN=2.7V
VIN=3.6V
50%
VIN=4.2V
VIN=4.5V
50%
VIN=4.2V
VIN=4.5V
5
10
15
20
25
5
10
15
20
25
LED Current (mA)
Figure 4. 3 LEDs: Efficiency vs. LED Current
vs. Input Voltage
90%
80%
70%
VIN=2.5V
LED Current (mA)
Figure 5. 4 LEDs: Efficiency vs. LED Current
vs. Input Voltage
90%
80%
70%
VIN=2.5V
60%
VIN=2.7V
VIN=3.6V
VIN=4.2V
VIN=4.5V
60%
VIN=2.7V
VIN=3.6V
VIN=4.2V
VIN=4.5V
50%
5
10
15
20
25
50%
5
10
15
20
25
LED Current (mA)
Figure 6. 5 LEDs: Efficiency vs. LED Current
vs. Input Voltage
90%
80%
70%
LED Current (mA)
Figure 7. 6 LEDs: Efficiency vs. LED Current
vs. Input Voltage
90%
80%
70%
60%
VIN=2.5V
VIN=2.7V
VIN=3.6V
60%
VIN=2.9V
VIN=3.6V
50%
VIN=4.2V
VIN=4.5V
50%
VIN=4.2V
VIN=4.5V
5
10
15
20
25
5
10
15
20
25
LED Current (mA)
Figure 8. 7 LEDs: Efficiency vs. LED Current
vs. Input Voltage
? 2011 Fairchild Semiconductor Corporation
FAN5346 ? Rev. 1.0.1
6
LED Current (mA)
Figure 9. 8 LEDs: Efficiency vs. LED Current
vs. Input Voltage
www.fairchildsemi.com
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