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NCP5050
TYPICAL OPERATING CHARACTERISTICS
1000
800
1200
1000
600
400
200
V in = 4.2 V
V in = 3.3 V
V in = 3.8 V
800
600
400
200
2 LEDs
3 LEDs
4 LEDs
5 LEDs
Operating Area
0
5
10
15
20
25
0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
90
V out (V)
Figure 4. Maximum Output Current Available
vs. V out
90
V in (V)
Figure 5. Typical Maximum Output Current vs.
Input Voltage, L = TDK VLF5014A ? 2R7M1R5
(Note 13)
80
70
V in = 5.0 V
V in = 4.2 V
80
70
V in = 5.0 V
V in = 4.2 V
60
V in = 3.7 V
V in = 3.3 V
60
V in = 3.7 V
V in = 3.3 V
50
10
100
1000
50
10
100
1000
90
80
I out (mA)
Figure 6. Efficiency vs. Current @ 2 LEDs
(7.0 V @ 350 mA),
L = TDK VLF5014A ? 2R7M1R5, (Notes 13 and 14)
V in = 5.0 V
90
80
I out (mA)
Figure 7. Efficiency vs. Current @ 3 LEDs
(10.5 V @ 350 mA),
L = TDK VLF5014A ? 2R7M1R5, (Notes 13 and 14)
V in = 5.0 V
70
V in = 4.2 V
70
V in = 4.2 V
60
V in = 3.7 V
V in = 3.3 V
60
V in = 3.7 V
V in = 3.3 V
50
10
100
1000
50
10
100
1000
I out (mA)
Figure 8. Efficiency vs. Current @ 4 LEDs
(14 V @ 350 mA),
L = TDK VLF5014A ? 2R7M1R5, (Notes 13 and 14)
Figure 9. Efficiency vs. Current @ 5 LEDs
(17.5 V @ 350 mA),
L = TDK VLF5014A ? 2R7M1R5 (Notes 13 and 14)
13. Pulse of 500 ms every 3 s in Flash Mode (Current following through HCS pin).
14. Efficiency = 100 x (Number of LED stacked x V LED x I LED )/P in .
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