Data Sheet

AL8805
Document number: DS35030 Rev. 4 - 2
4 of 16
www.diodes.com
July 2012
© Diodes Incorporated
A
L8805
Typical Performance Characteristics (@T
A
= +25°C, unless otherwise specified.)
0
50
100
150
200
250
300
350
400
V (V)
Figure 1 Supply Current (not switching) vs. Input Voltage
IN
I (µA)
IN
V = 0V
V = V
T = 25°C
CRTL
SET IN
A
06
12
18
24
30 36
0
100
200
300
400
500
600
700
800
900
012345
V(V)
Figure 2 Switching Frequency vs. V
CTRL
CTRL
F
R
E
Q
U
E
N
C
Y
(kHz)
V = 12V
1 LED
R = 150m
T = 25°C
IN
SET
A
Ω
L = 33µH
L = 68µH
L = 100µH
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
012345
V (V)
Figure 3 LED Current vs. V
CTRL
CTRL
I (A)
LED
V = 12V
1 LED
T = 25°C
IN
A
L = 68µH
R = 100m
SET
Ω
R = 150m
SET
Ω
R = 300m
SET
Ω
-60
-40
-20
0
20
40
60
80
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
V (V)
Figure 4 I vs. V
CTRL
CTRL CTRL
I (µ
A
)
CTRL
V = V = 12V
T = 25°C
SET IN
A
3
2.5
2
1.5
0.5
0
V (V)
CTRL
1
V = Open
V = V
CTRL
SET IN
T = 25°C
A
0 3 6 9 12 18 21 24 27 30 36
V (V)
Figure 5. V vs. Input Voltage
(CTRL Pin Open Circuit)
IN
CTRL
15 33
2.48
2.49
2.50
2.51
2.52
-40 -15 10 35 60 85 110
AMBIENT TEMPERATURE (°C)
Figure 6 V vs. Temperature
CTRL
V (V)
CTRL
V = Open
V = V = 12V
CTRL
SET IN