SC4539(2007) データシートの表示（PDF） - Semtech Corporation
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SC4539 Datasheet PDF : 14 Pages
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SC4539
Typical Characteristics
All data taken with V = 20V (6 white LEDs), R = 5.76kΩ (I = 20mA), V = 3.6V, L = 22μH, and efficiency (η) = P /P unless otherwise noted.
OUT
ISET
BL
IN
LED IN
Efficiency vs. I
BL
100
3.6VIN
Efficiency vs. Output Voltage
90
80
86
5.5VIN
2.8VIN
60
82
5.5VIN
40
3.3VIN
78
2.8VIN
20
74
0
0
6
12
18
24
30
I (mA)
BL
Efficiency vs. Input Voltage
90
86
70
0
5
10
15
20
25
VOUT (V)
Efficiency vs. Input Voltage
90
6 LED
86
82
VOUT
78
LED
82
4 LED
78
74
70
2.8
3.3
3.9
4.4
5.0
5.5
VIN (V)
Efficiency vs. Input Voltage
90
20mA
86
82
78
10mA
74
30mA
70
2.8
3.3
3.9
4.4
5.0
5.5
V (V)
IN
74
70
2.8
6.0
4.0
2.0
0.0
-2.0
-4.0
-6.0
0
3.3
3.9
4.4
5.0
5.5
VIN (V)
Normalized I vs. Output Voltage
BL
5
10
15
20
25
V (V)
OUT
5
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