SC4540 データシートの表示（PDF） - Semtech Corporation
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SC4540 Datasheet PDF : 15 Pages
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SC4540
Typical Characteristics
All data taken with V = 26.5V (8 white LEDs), R = 5.76kΩ (I = 20mA), V = 7.2V, L = 56μH, and efficiency (η) = P /P unless otherwise noted.
OUT
ISET
OUT
IN
LED IN
Efficiency vs. I
BL
Efficiency versus Output Voltage
90
86 VIN = 8.4V
VIN = 7.2V
82
VIN = 12V
90
86
VIN = 5.0V
82
VIN = 12V
VIN = 8.4V
VIN = 5.0V
VIN = 7.2V
78
78
74
74
70
10
15
20
25
30
IBL (m A)
Efficiency versus Input Voltage
90
30 mA
88
20 mA
86
84
10 mA
82
70
20
22
24
26
28
30
VOUT (V)
Efficiency versus Input Voltage
90
88
6 LEDs
86
10 LEDs
8 LEDs
84
82
80
4.5
6.0
7.5
9.0
10.5
12.0
VIN (V)
80
4.5
6.0
7.5
9.0
10.5
12.0
VIN (V)
Efficiency versus Input Voltage
90
88
VOUT Efficiency
LED Efficiency
86
84
82
80
4.5
6.0
7.5
9.0
10.5
12.0
VIN (V)
Normalized IBL versus Output Voltage
3.5
2.5
1.5
0.5
VIN = 12V
VIN = 8.4V
-0.5
-1.5
VIN = 7.2V
VIN = 5.0V
-2.5
-3.5
20
22
24
26
28
30
VOUT (V)
5
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