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NCP5008, NCP5009
TYPICAL OPERATING CHARACTERISTICS
Condition: Typical Application: L = 22 m H, Cin = 10 m F, Cout = 2.2 m F, R1 = 30 k W
80
80
75
V bat = 4.2 V
75
V bat = 4.2 V
V bat = 3.6 V
70
70
65
60
V bat = 3.6 V
65
60
55
50
V bat = 3.0 V
55
50
V bat = 3.0 V
0
5
10
15
20
25
30
35
0
5
10
15
20
25
30
35
85
I LED (mA)
Figure 3. Efficiency vs. Load Current @ 4 LEDS
(V load = 4*Vf ? 14.2 V )
V bat = 4.2 V
100
I LED (mA)
Figure 4. Efficiency vs. Load Current @ 3 LEDS
(V load = 3*Vf ? 10.5 V )
80
75
70
65
60
V bat = 3.6 V
V bat = 3.0 V
90
80
70
60
50
V out =7.5 V
I led = 40 mA
V out = 15 V
I led = 20 mA
0
5
10
15
20
25
30
35
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
I LED (mA)
Figure 5. Efficiency vs. Load Current @ 2 LEDS
(V load = 2*Vf ? 7.1 V)
V bat (V)
Figure 6. Efficiency vs. V bat @
V out = 15 V/I led = 20mA and
V out = 7.5 V/I led = 40 mA
100
95
90
85
80
V bat = 6.0 V
5.0 V
4.2 V
3.6 V
400
350
300
250
200
150
100
50
Bn
7
6
5
4
3
2
1
3.0 V
75
0
10
20
30
40
50
60
70
0
0
20
40
60
80
I LED (mA)
Figure 7. Efficiency vs. Load Current @ 4 LEDS
(V load = 2 strings of 2 LEDs in series = 7.1V)
http://onsemi.com
6
I ref ( m A)
Figure 8. Inductor peak Current vs.
I ref @ Bn = {1, 2, 3, 4, 5, 6, 7}
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