FAN5346 データシートの表示（PDF） - Fairchild Semiconductor
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FAN5346 Datasheet PDF : 14 Pages
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Typical Characteristics
VIN = 3.6V, TA = 25°C, ILED = 25mA, L = 10µH, COUT = 1.0µF, and CIN = 10.0µF.
90%
90%
80%
80%
70%
70%
60%
-40C
+25C
+85C
50%
2.5
3.0
3.5
4.0
4.5
Input Voltage (V)
Figure 10. Efficiency vs. Input Voltage vs. Temperature
for 5 LEDs in Series
60%
-40C
+25C
50%
+85C
2.5
3.0
3.5
4.0
4.5
Input Voltage (V)
Figure 11. Efficiency vs. Input Voltage vs. Temperature
for 7 LEDs in Series
0.2
0.1
0.0
-0.1
-0.2
-40°C
-0.3
+25°C
+85°C
-0.4
2.5
3.0
3.5
4.0
4.5
Input Voltage (V)
Figure 12. Delta of VFB Over Input Voltage and
Temperature for 7 LEDs with L=10µH and COUT=1.0µF
1250
1200
1150
1100
1050
-40°C
+25°C
+85°C
1000
2.5
3.0
3.5
4.0
4.5
Input Voltage (V)
Figure 13. Frequency vs. Input Voltage vs. Temperature
21.0
20.5
5 LEDs
L = 10µH
COUT = 1.0µF
ILED = 25mA
20.0
31.5
31.0
7 LEDs
L = 10µH
COUT = 1.0µF
ILED = 25mA
30.5
19.5
30.0
19.0
29.5
18.5
2.5
3.0
3.5
4.0
4.5
Input Voltage (V)
Figure 14. OVP vs. Input Voltage: FAN5346S20X
29.0
2.5
3.0
3.5
4.0
4.5
Input Voltage (V)
Figure 15. OVP vs. Input Voltage: FAN5346S30X
© 2011 Fairchild Semiconductor Corporation
FAN5346 • Rev. 1.0.1
7
www.fairchildsemi.com
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