NCP5007
TYPICAL OPERATING CHARACTERISTICS
(All curve conditions: L = 22 mH, Cin = 4.7 mF, C = 1.0 mF, Typical curve @ T = +25°C)
out
a
100
90
80
70
60
50
40
30
20
10
0
30
25
20
2 LED/40 mA
3 LED/40 mA
I
= 20 mA Nom
OUT
5 LED/40 mA
4 LED/40 mA
15
10
5
I
= 10 mA Nom
OUT
L = 22 mH
T = 25°C
A
0
2.5
3.0
3.5
4.0
(V)
4.5
5.0
5.5
2.50
3.00
3.50
4.00
(V)
4.50
5.00
5.50
V
bat
V
BAT
Figure 14. Overall Efficiency vs. Power Supply −
Figure 15. Current Variation vs. Power Supply with
3 Series LED’s
Iout = 40 mA, L = 22 mH
25
20
15
10
25
20
15
10
I
= 20 mA Nom
I
= 20 mA Nom
OUT
OUT
I
= 10 mA Nom
I
= 10 mA Nom
OUT
OUT
5
0
5
0
L = 22 mH
T = 25°C
A
L = 22 mH
T = 25°C
A
2.5
3.0
3.5
4.0
(V)
4.5
5.0
5.5
2.5
3.0
3.5
4.0
(V)
4.5
5.0
5.5
V
V
BAT
BAT
Figure 16. Current Variation vs. Power Supply with
4 Series LED’s
Figure 17. Current Variation vs. Power Supply with
5 Series LED’s
205
5
4
3
2
204
203
202
201
200
199
198
197
V
bat
= 3.1 V thru 5.5 V
1
0
V
bat
= 3.1V thru 5.5V
−1
−2
−3
196
195
−40
−4
−5
−40
−20
0
20
40
60
80
100
−20
0
20
40
60
80
100
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 18. Feedback Voltage Stability
Figure 19. Feedback Voltage Variation
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