Instruction Manual

AL8807A
Document number: DS35990 Rev. 2 - 2
7 of 20
www.diodes.com
March 2013
© Diodes Incorporated
A
L8807A
Typical Performance Characteristics (cont.) (@T
A
= +25°C, unless otherwise specified.)
Figure 14 Efficiency vs. Input Voltage
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
6 9 12 15 18 21 24 27 30 33 36
INPUT VOLTAGE (V)
Figure 13 Duty Cycle vs. Input Voltage
R = 150m
L = 33µH
T = 25°C
2 LEDs
CTRL Open
S
A

D
U
T
Y
C
Y
C
LE (%)
0
100
200
300
400
500
600
700
800
6 9 12 15 18 21 24 27 30 33 36
INPUT VOLTAGE (V)
Figure 15 Switching Frequency vs. Input Voltage
2 LEDs
3 LEDs
4 LEDs
5 LEDs 6 LEDs
7 LEDs
8 LEDs
R = 300m
L = 68µH
T = 25°C
CTRL Open
S
A

1 LED
SWI
T
C
H
IN
G
F
R
E
Q
U
EN
C
Y
(
k
H
z)
0.3
0.31
0.32
0.33
0.34
0.35
0.36
6 9 12 15 18 21 24 27 30 33 36
INPUT VOLTAGE (V)
Figure 16 330mA LED Current vs. Input Voltage
LED CURRENT (A)
0.60
0.62
0.64
0.66
0.68
0.70
0.72
0.74
6 9 12 15 18 21 24 27 30 33 36
INPUT VOLTAGE (V)
Figure 17 670mA LED Current vs. Input Voltage
1 LED
2 LEDs
3 LEDs
4 LEDs
5 LEDs
6 LEDs
7 LEDs
8 LEDs
R = 150m
L = 68µH
T = 25°C
CTRL Open
S
A

LED
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
INPUT VOLTAGE (V)
Figure 18 1A LED Current vs. Input Voltage
1 LED
2 LEDs
3 LEDs
4 LEDs
5 LEDs
6 LEDs
7 LEDs
8 LEDs
R = 100m
L = 68µH
T = 25°C
V = Open
S
A
CTRL

LED
C
U
R
R
E
N
T
(A)