SC4538 データシートの表示（PDF） - Semtech Corporation
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SC4538 Datasheet PDF : 14 Pages
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SC4538
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
Efficiency vs. Output Voltage
100
90
3.6VIN
80
60
5.5VIN
40
86
2.8VIN
82
78
5.5VIN
2.8VIN
3.6VIN
20
74
0
0
6
12
18
24
30
I (mA)
BL
Efficiency vs. Input Voltage
90
86
70
0
8
16
24
32
40
V (V)
OUT
Efficiency vs. Input Voltage
90
6 LEDs
4 LEDs
86
82
VOUT
78
LED
82
10 LEDs
78
74
74
70
2.8
3.3
3.9
4.4
5.0
5.5
V (V)
IN
70
2.8
3.3
3.9
4.4
5.0
5.5
V (V)
IN
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
VIN (V)
Normalized I vs. Output Voltage
BL
6
4
2
0
-2
-4
-6
0
8
16
24
32
40
VOUT (V)
5
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