Datasheet

VISHAY
IL410/ IL4108
Document Number 83627
Rev. 1.4, 26-Apr-04
Vishay Semiconductors
www.vishay.com
5
The hold-off condition also can be eliminated by pro-
viding a higher level of LED drive current. The higher
LED drive provides a larger photocurrent which
causes the phototransistor to turn-on before the com-
mutating spike has activated the zero cross network.
Figure 2 shows the relationship of the LED drive for
power factors of less than 1.0. The curve shows that
if a device requires 1.5 mA for a resistive load, then
1.8 times (2.7 mA) that amount would be required to
control an inductive load whose power factor is less
than 0.3.
Typical Characteristics (T
amb
= 25 °C unless otherwise specified)
Fig. 2 Normalized LED Trigger Current vs. Power Factor
Fig. 3 Forward Voltage vs. Forward Current
iil410_02
1.21.00.80.60.40.20.0
0.8
1.0
1.2
1.4
1.6
1.8
2.0
PF - Power Factor
NIFth - Normalized LED
Trigger Current
Ta = 25°C
IFth Normalized to IFth @ PF = 1.0
iil410_03
100101.1
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 = 85°C
Fig. 4 Peak LED Current vs. Duty Factor, Tau
Fig. 5 Maximum LED Power Dissipation
iil410_04
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
iil410_05
100806040200-20-40-60
0
50
100
150
Ta - Ambient Temperature - °C
LED - LED Power - mW