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SC4540 Datasheet(PDF) 5 Page - Semtech Corporation

Part # SC4540
Description  High Effi ciency Boost Converter for up to 10 LEDs
PDF  15 Pages
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Manufacturer  SEMTECH [Semtech Corporation]
Direct Link  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC4540 Datasheet(HTML) 5 Page - Semtech Corporation

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5
Typical Characteristics
SC4540
Efficiency vs. I
BL
Efficiency versus Input Voltage
Efficiency versus Input Voltage
Efficiency versus Output Voltage
Efficiency versus Input Voltage
Normalized I
BL versus Output Voltage
70
74
78
82
86
90
10
15
20
25
30
IBL (m A )
V IN = 8.4V
V IN = 12V
V IN = 7.2V
V IN = 5.0V
70
74
78
82
86
90
20
22
24
26
28
30
V OUT (V )
V IN = 12V
V IN = 5.0V
V IN = 7.2V
V IN = 8.4V
80
82
84
86
88
90
4.5
6.0
7.5
9.0
10.5
12.0
V IN (V )
8 LE D s
10 LE D s
6 LE D s
-3.5
-2.5
-1.5
-0.5
0.5
1.5
2.5
3.5
20
22
24
26
28
30
V OUT (V)
V IN = 12V
V IN = 8.4V
V IN = 7.2V
V IN = 5.0V
80
82
84
86
88
90
4.5
6.0
7.5
9.0
10.5
12.0
V IN (V )
LE D E fficiency
V OUT E fficiency
80
82
84
86
88
90
4.5
6.0
7.5
9.0
10.5
12.0
V IN (V)
30 m A
10 m A
20 m A
All data taken with V
OUT
= 26.5V (8 white LEDs), R
ISET
= 5.76kΩ (I
OUT
= 20mA), V
IN
= 7.2V, L = 56μH, and efficiency (η) = P
LED
/P
IN
unless otherwise noted.



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