Typical performance characteristics, Al8807 – Diodes AL8807 User Manual
Page 5
AL8807
Document number: DS35281 Rev. 5 - 2
5 of 20
March 2013
© Diodes Incorporated
AL8807
Typical Performance Characteristics
(cont.)
LED Current
LED Current
Error
L = 68H, R = 150m
T = 25C, V = 12V
CTRL = PWM, f
= 500Hz
1 LED
S
A
IN
PWM
0
20
40
60
80
100
PWM DUTY CYCLE
Figure 7. I
vs. PWM Duty Cycle
LED
9
8
7
6
4
3
2
0
L
E
D CURRE
NT
ERROR (
%
)
5
1
0.8
L
E
D CURRENT
(
A
)
0.7
0.6
0.5
0
0.4
0.3
0.2
0.1
6
9
12
18 21
24
27 30
36
V (V)
Figure 8. SW R
vs. Input Voltage
IN
DS(ON)
15
33
300
270
210
150
30
0
R
(m
)
DS
(O
N)
90
240
180
120
60
V
= Open
V
= V
CTRL
SET
IN
T = 25°C
A
-40
-15
35
60
110
10
85
Ambient Temperature ( C)
Figure 9. SW R
vs. Temperature
DS(ON)
V
= Open
V
= V
= 12V
CTRL
SET
IN
400
250
150
100
R
(m
)
DS
(O
N)
350
300
200
6
9
12 15 18 21
24 27 30 33 36
INPUT VOLTAGE (V)
Figure 10. Duty Cycle vs. Input Voltage
100
90
80
70
60
40
30
20
10
0
50
D
U
T
Y
C
Y
C
LE
(
%
)
2 LEDS
3 LEDS
L = 68µH
R = 100m
T = 25°C
V
= Open
S
A
CTRL
Figure. 11 SW Output Rise Time
Figure. 12 SW Output Fall Time