Diodes AL8805 - Manual (Page 7)

AL8805
Document number: DS35030 Rev. 4 - 2
7 of 16
www.diodes.com
July 2012
© Diodes Incorporated
AL8805
Typical Performance Characteristics
(cont.) (670mA LED Current) (@T
A
= +25°C, unless otherwise specified.)
5%
INPUT VOLTAGE (V)
Figure 18 LED Current Deviation vs. Input Voltage
% E
R
R
O
R
6 9 12 15 18 21 24 27 30 33 36
4%
3%
2%
1%
0%
-1%
-2%
-3%
-4%
-5% 0
50
100
150
200
250
300
350
INPUT VOLTAGE (V)
Figure 19 Switching Frequency vs. Input Voltage
F
R
E
Q
U
E
N
C
Y
(k
Hz
)
L = 100 H
R = 150m
T = 25 C µ
°
S
A
Ω
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
INPUT VOLTAGE (V)
Figure 20 LED Current Deviation vs. Input Voltage
-10%
-8%
-6%
-4%
-2%
0%
2%
4%
6%
8%
10%
%
E
R
R
O
R
6 9 12 15 18 21 24 27 30 33 36
0
50
100
150
200
250
300
350
400
450
500
INPUT VOLTAGE (V)
Figure 21 Switching Frequency vs. Input Voltage
S
W
ITCHI
NG
FRE
Q
UE
NCY (k
Hz
)
6 9 12 15 18 21 24 27 30 33 36
-10%
-8%
-6%
-4%
-2%
0%
2%
4%
6%
8%
10%
INPUT VOLTAGE (V)
Figure 22 LED Current Deviation vs. Input Voltage
%
E
R
R
O
R
6 9 12 15 18 21 24 27 30 33 36
INPUT VOLTAGE (V)
Figure 23 Switching Frequency vs. Input Voltage
0
100
200
300
400
500
600
700
800
F
R
E
Q
UE
NCY
(k
Hz
)
6 9 12 15 18 21 24 27 30 33 36
900