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SC4539
Typical Characteristics
All data taken with V OUT = 20V (6 white LEDs), R ISET = 5.76kΩ (I BL = 20mA), V IN = 3.6V, L = 22μH, and effi ciency (η) = P LED /P IN unless otherwise noted.
100
Effi ciency vs. I BL
3.6V IN
90
Effi ciency vs. Output Voltage
80
2.8V IN
86
5.5V IN
60
5.5V IN
82
3.3V IN
40
20
0
78
74
70
2.8V IN
0
6
12
18
24
30
0
5
10
15
20
25
90
I BL (mA)
Effi ciency vs. Input Voltage
90
V OUT (V)
Effi ciency vs. Input Voltage
86
82
78
74
V OUT
LED
86
82
78
74
6 LED
4 LED
70
2.8
3.3
3.9
4.4
5.0
5.5
70
2.8
3.3
3.9
4.4
5.0
5.5
90
86
V IN (V)
Effi ciency vs. Input Voltage
20mA
6.0
4.0
V IN (V)
Normalized I BL vs. Output Voltage
2.0
82
0.0
78
74
70
10mA
30mA
-2.0
-4.0
-6.0
2.8
3.3
3.9
4.4
5.0
5.5
0
5
10
15
20
25
V IN (V)
V OUT (V)
5
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