Datasheet

5–2
IL256A
Figure 1. LED forward current versus forward voltage
Figure 2. Forward voltage versus forward current
Figure 3. Peak LED current versus duty factor, Tau
Figure 4. Normalized CTR versus If and Ta
-1.5 -1.0 -0.5 0.0 0.5 1.0 1.5
-60
-40
-20
0
20
40
60
25°C
85°C
-55°C
VF - LED Forward Voltage - V
IF - LED Forward Current - mA
.1 1 10 100
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
If - Forward Current - mA
Vf-Forward Voltage - V
Ta = -55°C
Ta = 25°C
Ta = 100°C
10
-6
10
-5
10
-4
10
-3
10
-2
10
-1
10
0
10
1
10
100
1000
10000
t - LED Pulse Duration - s
If(pk) - Peak LED Current - mA
.005
.05
.02
.01
.1
.2
.5
Duty Factor
t
τ
DF = /t
τ
.1 1 10 100
0.0
0.5
1.0
1.5
2.0
Ta = 25°C
Ta = 50°C
Ta = 70°C
Ta = 100°C
If - LED Current - mA
Normalized CTR
Normalized to :
If = 10 mA, Vce =10V
Ta = 25°C
Figure 5. Normalized saturated CTR
Figure 6. Normalized CTRcb
Figure 7. Photocurrent versus LED current
Figure 8. Base current versus If and HFE
.1 1 10 100
0.0
0.2
0.4
0.6
0.8
1.0
Ta = 25°C
Ta = 50°C
Ta = 70°C
Ta = 100°C
If - LED Current - mA
Normalized CTR
Normalized to:
If = 10 mA. Vce =10V
Ta = 25°C
Vce(sat) = 0.4V
.1 1 10 100
0.0
0.5
1.0
1.5
25°C
50°C
70°C
If - LED Current -mA
Normalized CTRcb
Normalized to:
If=10mA, Ta=25°C
.1 1 10 100
.1
1
10
100
1000
25°C
70°C
If - LED Current - mA
Icb - Photocurrent - µA
1 10 100 1000
100
200
300
400
500
600
700
.1
1
10
100
Ib - Base Current - µA
HFE - Transistor Gain
If- LED Current-mA
Vce=0.4V, Ta=25°C