Diodes AL8807A - Manual (Page 8)

AL8807A
Document number: DS35990 Rev. 2 - 2
8 of 20
www.diodes.com
March 2013
© Diodes Incorporated
AL8807A
Typical Performance Characteristics
(670mA LED Current) (@T
A
= +25°C, unless otherwise specified.)
6 9 12 15 18 21 24 27 30 33 36
INPUT VOLTAGE (V)
Figure 19 LED Current Deviation vs. Input Voltage
10
8
2
0
-8
-10
LE
D
C
U
R
R
E
N
T
E
R
R
O
R
(%)
4
-4
-6
-2
6
5 LEDs
6 LEDs
7 LEDs 8 LEDs
L = 100µH
R = 150m
T = 25°C
V = Open
S
A
CTRL

2 LEDs
3 LEDs4 LEDs
6 9 12 15 18 21 24 27 30 33 36
INPUT VOLTAGE (V)
Figure 20 Switching Frequency vs. Input Voltage
350
300
200
50
0
SW
IT
C
H
IN
G
F
R
E
Q
U
EN
C
Y
(k
H
z)
250
100
150
1 LED
6 9 12 15 18 21 24 27 30 33 36
INPUT VOLTAGE (V)
Figure 21 LED Current Deviation vs. Input Voltage
10
8
2
0
-8
-10
LE
D
C
U
R
R
EN
T
E
R
R
O
R
(%) 4
-4
-6
-2
6
5 LEDs
6 LEDs
7 LEDs
8 LEDs
L = 68µH
R = 150m
T = 25°C
V = Open
S
A
CTRL

2 LEDs
3 LEDs
4 LEDs
6 9 12 15 18 21 24 27 30 33 36
INPUT VOLTAGE (V)
Figure 22 Switching Frequency vs. Input Voltage
500
450
300
250
50
0
SW
IT
C
H
IN
G
F
R
E
Q
U
EN
C
Y
(k
H
z)
350
150
100
200
400
1 LED
6 9 12 15 18 21 24 27 30 33 36
INPUT VOLTAGE (V)
Figure 23 LED Current Deviation vs. Input Voltage
10
8
4
2
0
-4
-8
-10
LE
D
C
U
R
R
EN
T
E
R
R
O
R
(%
)
6
-2
-6
6 9 12 15 18 21 24 27 30 33 36
INPUT VOLTAGE (V)
Figure 24 Switching Frequency vs. Input Voltage
800
700
500
400
100
0
SW
IT
C
H
IN
G
F
R
E
Q
U
EN
C
Y
(k
H
z)
1 LED
2 LEDs
3 LEDs
4 LEDs
5 LEDs
6 LEDs
7 LEDs 8 LEDs
L = 33µH
R = 150m
T = 25°C
V = Open
S
A
CTRL

600
300
200