Diodes AP2502 - Manual (Page 7)

Data Sheet
4-CH Linear Constant Current Sink With Matching AP2502
Oct. 2010 Rev 1. 1 BCD Semiconductor Manufacturing Limited
7
-40 -20 0 20 40 60 80 100 120 140
20
30
40
50
60
70
80
90
100
110
120
Dropout Voltage
(m
V)
Case Temperature ( o C)
-40 -20 0 20 40 60 80 100 120 140
-1.0
-0.8
-0.6
-0.4
-0.2
0.0
0.2
0.4
0.6
0.8
1.0
V
EN
=3V
V
LED
=300mV
Current
M
a
tc
hing
(%)
Case Temperature ( o C)
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
16.0
16.5
17.0
17.5
18.0
18.5
19.0
19.5
20.0
20.5
21.0
21.5
22.0
22.5
23.0
23.5
24.0
V
LED
=300mV
T
C
=25 o C
I LE
D
(m
A)
Enable Voltage (V)
0 10 20 30 40 50 60 70 80 90
-10
0
10
20
30
40
50
60
70
80
90
100
110
f=100Hz
f=10kHz
f=100kHz
f=150kHz
T
C
=25 o C
L
E
D
Cur
rent Ef
ficiency (%)
Duty Cycle (%)
99
Typical Performance Characteristics (Continued)
Figure 8. Dropout Voltage vs. Case Temperature Figure 9. Current Matching vs. Case Temperature
Figure 10. LED Current vs. Enable Voltage Figure 11. LED Current Efficiency vs. Duty Cycle