IL410 데이터 시트보기 (PDF) - Siemens AG
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IL410 Datasheet PDF : 6 Pages
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Power Factor Considerations
A snubber isn’t needed to eliminate false operation of the
TRIAC driver because of the IL410’s high static and commu-
tating dv/dt with loads between 1 and 0.8 power factors.
When inductive loads with power factors less than 0.8 are
being driven, include a RC snubber or a single capacitor
directly across the device to damp the peak commutating
dv/dt spike. Normally a commutating dv/dt causes a turning-
off device to stay on due to the stored energy remaining in
the turning-off device.
But in the case of a zero voltage crossing optotriac, the
commutating dv/dt spikes can inhibit one half of the TRIAC
from turning on. If the spike potential exceeds the inhibit
voltage of the zero cross detection circuit, half of the TRIAC
will be held-off and not turn-on. This hold-off condition can
be eliminated by using a snubber or capacitor placed
directly across the optotriac as shown in Figure 1. Note that
the value of the capacitor increases as a function of the load
current.
Figure 1. Shunt capacitance versus load current
1
Cs(µF)= 0.0032(µF)* 10^(0.0066IL(mA))
.1
Ta = 25°C, PF = 0.3
.01
IF = 2.0mA
.001
0
50 100 150 200 250 300 350 400
IL - Load Current - mA(RMS)
The hold-off condition also can be eliminated by providing a
higher level of LED drive current. The higher LED drive pro-
vides a larger photocurrent which causes the phototransis-
tor to turn-on before the commutating 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.
Figure 2. Normalized LED trigger current versus
power factor
2.0
IFth Normalized to IFth @ PF = 1.0
Ta = 25°C
1.8
1.6
1.4
1.2
1.0
0.8
0.0
0.2
0.4
0.6
0.8
1.0
1.2
PF - Power Factor
Figure 3. Forward voltage versus forward current
1.4
1.3
Ta = -55°C
1.2
1.1
Ta = 25°C
1.0
0.9
Ta = 85°C
0.8
0.7
.1
1
10
100
IF - Forward Current - mA
Figure 4. Peak LED current versus duty factor, Tau
10000
1000
100
Duty Factor
.005
.01
.02
.05
.1
.2
.5
τ
t
DF = τ/t
10
10-6 10-5 10-4 10-3 10-2 10-1 10 0 10 1
t - LED Pulse Duration - s
IL410
5–3
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