Diodes AL8807A - Manual (Page 9)

AL8807A
Document number: DS35990 Rev. 2 - 2
9 of 20
www.diodes.com
March 2013
© Diodes Incorporated
AL8807A
Typical Performance Characteristics
(1A LED Current) (@T
A
= +25°C, unless otherwise specified.)
5 LEDs
6 LEDs
7 LEDs
8 LEDs
L = 100µH
R = 100m
T = 25°C
V = Open
S
A
CTRL

1 LED
2 LEDs
3 LEDs
4 LEDs
6 9 12 15 18 21 24 27 30 33 36
INPUT VOLTAGE (V)
Figure 25 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 = 100µH
R = 100m
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 26 Switching Frequency vs. Input Voltage
350
300
200
0
SW
IT
C
H
IN
G
F
R
E
Q
U
EN
C
Y
(k
H
z)
250
50
150
1 LED
100
6 9 12 15 18 21 24 27 30 33 36
INPUT VOLTAGE (V)
Figure 27 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 = 100m
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 28 Switching Frequency vs. Input Voltage
350
300
200
0
SW
IT
C
H
IN
G
F
R
E
Q
U
E
N
C
Y
(k
H
z)
250
50
150
1 LED
100
6 9 12 15 18 21 24 27 30 33 36
INPUT VOLTAGE (V)
Figure 29 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
6 9 12 15 18 21 24 27 30 33 36
INPUT VOLTAGE (V)
Figure 30. Switching Frequency vs. Input Voltage
600
500
300
0
SW
IT
C
H
IN
G
F
R
E
Q
U
EN
C
Y
(k
H
z)
400
100
200