Diodes AL8805 - Manual (Page 6)

AL8805
Document number: DS35030 Rev. 4 - 2
6 of 16
www.diodes.com
July 2012
© Diodes Incorporated
AL8805
Typical Performance Characteristics
(cont.) (@T
A
= +25°C, unless otherwise specified.)
80%
82%
84%
86%
88%
90%
92%
94%
96%
98%
100%
6 9 12 15 18 21 24 27 33
INPUT VOLTAGE (V)
Figure 13 Efficiency vs. Input Voltage
EF
FI
C
IE
N
C
Y
30 36
1 LED
2 LEDs
3 LEDs
4 LEDs
5 LEDs
6 LEDs 7 LEDs
8 LEDs
L = 100µH
R = 150m
T = 25°C
S
A
Ω
2 LEDs
4 LEDs
5 LEDs 6 LEDs
8 LEDs
INPUT VOLTAGE (V)
Figure 14 330mA LED Current vs. Input Voltage
LE
D
C
U
R
R
ENT
(
A
)
0.30
0.31
0.32
0.33
0.34
0.35
0.36
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1 LED
3 LEDs
L = 68 H
R = 300m
T = 25 C µ
°
S
A
Ω
7 LEDs
0
50
100
150
200
250
300
350
INPUT VOLTAGE (V)
Figure 15 Switching Frequency vs. Input Voltage
L = 100 H
R = 150m
T = 25 C µ
°
S
A
Ω
S
W
IT
CH
IN
G F
R
E
QU
E
NC
Y
(
k
H
z
)
6 9 12 15 18 21 24 27 30 33 36
1 LED
2 LEDs
3 LEDs 4 LEDs
5 LEDs
6 LEDs
7 LEDs
8 LEDs
6 9 12 15 18 21 24 27 36
INPUT VOLTAGE (V)
Figure 16 670mA LED Current vs. Input Voltage
L
E
D
CU
RR
E
NT
(
A
)
0.720
30 33
0.710
0.700
0.690
0.680
0.670
0.660
0.650
0.640
0.630
0.620
INPUT VOLTAGE (V)
Figure 17 1A LED Current vs. Input Voltage
L
E
D
C
U
R
R
E
N
T
(
A
)
0.90
0.95
1.00
1.05
1.10
6 9 12 15 18 21 24 27 30 33 36