NCP5008 データシートの表示（PDF） - ON Semiconductor
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NCP5008 Datasheet PDF : 17 Pages
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NCP5008, NCP5009
TYPICAL OPERATING CHARACTERISTICS
Condition: Typical Application: L = 22 mH, Cin = 10 mF, Cout = 2.2 mF, R1 = 30 kW
50
20
45
Vload = 10 V
18
40
16
35
14
30
12
25
Vload = 15 V
10
20
8
15
6
10
4
5
2
0
0
10
20 30
40 50
60 70
0
0 50 100 150 200 250 300 350 400
Iref (mA)
THEORETICAL Ipeak (mA)
Figure 9. Load Current (Iled) vs. Iref
@ Vbat = 3.6 V, Vload = 15 V and 10 V
Figure 10. Inductor Peak Current Error vs.
Theoretical Inductor Peak Current
200
7.0
180
6.5
160
Theoretical
6.0
140
Measured
120
5.5
100
5.0
80
60
40
20
0
0
4.5
4.0
3.5
3.0
10
20
30
40
2.4 2.8 3.2 3.6 4.0 4.4 4.8 5.2 5.6 6.0
Iphoto (mA)
Figure 11. Inductor Peak Current vs. Iphoto @ Iref = 34 mA
Vbat (V)
Figure 12. Stand by Current vs. Vbat @ T = 20°C
80
75
Vbat = 4.2 V
70
65
60
Vbat = 3.6 V
55
Vbat = 3.0 V
50
0
5
10
15 20
25 30
35
ILED (mA)
Figure 13. Efficiency vs. Load Current @ 4 LEDS
(Vload = 4*Vf ⇒ 14.2 V)
85
80
Vbat = 4.2 V
75
Vbat = 3.6 V
70
65
60
55
Vbat = 3.0 V
50
0
5
10
15
20
25
30
35
ILED (mA)
Figure 14. Efficiency vs. Load Current @ 3 LEDS
(Vload = 3*Vf ⇒ 10.5 V)
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