5
Figure 4. Relative eciency (luminous intensity
per unit current) vs. LED peak current. hv
(300 mA) for AlGaAs Red = 0.7.
Figure 2. Forward current vs. forward voltage
characteristics. V
F
(300 mA) for AlGaAs Red = 2.6
volts typical.
Figure 3. Relative luminous intensity vs. DC
forward current.
Figure 5. Maximum tolerable peak current vs. peak duration.
(I
PEAK
MAX determined from temperature derated I
DC
MAX).
Figure 6. Relative luminous intensity vs. angular displacement.
I
F
– FORWARD CURRENT – mA
1.0
V
F
– FORWARD VOLTAGE – V
0
20
40
60
2.0 3.0
90
70
GREEN
YELLOW
RED
AlGaAs
RED
10
30
50
80
4.0 5.0
RELATIVE LUMINOUS INTENSITY
(NORMALIZED AT 20 mA)
0
I
DC
– DC CURRENT PER LED – mA
0
305 15
2.5
2.0
AlGaAs RED
0.5
1.0
1.5
10 20 25
HER, YELLOW,
GREEN
η
PEAK
– RELATIVE EFFICIENCY
(NORMALIZED AT 20 mA)
0
I
PEAK
– PEAK SEGMENT CURRENT – mA
0.4
0.6
0.8
1.0
9020 705040
1.3
1.1
GREEN
YELLOW
RED/ORANGE
AlGaAs RED
0.5
0.7
0.9
1.2
30 60 8010
RATIO OF MAXIMUM TOLERABLE
PEAK CURRENT TO MAXIMUM
TOLERABLE DC CURRENT
1
t
P
– PULSE DURATION – s
HER, ORANGE, YELLOW, and GREEN
1.0
2.0
3.0
10,0001000
4.0
1.5
10010
I
PEAK
MAX.
I
DC
MAX.
100 KHz
30 KHz
10 KHz
3 KHz
1 KHz
300 Hz
100 Hz
t
p
– PULSE DURATION – s
AlGaAs RED
3
1
10
10 1000010001001
3 KHz
10 KHz
1 KHz
300 Hz
f – REFRESH RATE – 100 Hz
2
9
8
7
6
5
4
RATIO OF MAXIMUM PEAK CURRENT
TO TEMPERATURE DERATED
MAXIMUM DC CURRENT
I
PEAK
MAX.
I
DC
MAX.
10 10040 7020 60 8030 50 90
0
10
20
30
40
50
60
70
80
90
1.0
0.6
0.8
0.2
0.4
