IL4108-X007T Vishay, IL4108-X007T Datasheet - Page 6

• Manufacturer Part Number: IL4108-X007T
• Description: OPTOCPLR 6PIN TRIAC OPT.7 -e3
• Manufacturer: Vishay

Specifications of IL4108-X007T

• Number Of Elements: 1
• Forward Voltage: 1.35V
• Repetitive Peak Off-state Volt: 800V
• Operating Temp Range: -55C to 100C
• Output Current: 300mA
• Package Type: PDIP SMD
• Reverse Breakdown Voltage: 6V
• Mounting: Surface Mount
• Pin Count: 6
• Zero Crossing Circuit: Yes
• Operating Temperature Classification: Industrial
• Forward Current: 60mA
• Power Dissipation: 500mW
• Output Device: Triac
• Isolation Voltage: 5300Vrms
• Lead Free Status / RoHS Status: Supplier Unconfirmed

IL410, IL4108
Vishay Semiconductors
INDUCTIVE AND RESISTIVE LOADS
For inductive loads, there is phase shift between voltage and current, shown in the fig. 12.
The voltage across the triac will rise rapidly at the time the
current through the power handling triac falls below the
holding current and the triac ceases to conduct. The rise
rate of voltage at the current commutation is called
commutating dV/dt. There would be two potential problems
for ZC phototriac control if the commutating dV/dt is too
high. One is lost control to turn off, another is failed to keep
the triac on.
Lost control to turn off
If the commutating dV/dt is too high, more than its critical
rate (dV/dt
LED drive current I
In order to achieve control with certain inductive loads of
power factors is less than 0.8, the rate of rise in voltage
(dV/dt) must be limited by a series RC network placed in
parallel with the power handling triac. The RC network is
called snubber circuit. Note that the value of the capacitor
increases as a function of the load current as shown in fig. 13.
Failed to keep on
As a zero-crossing phototriac, the commutating dV/dt
spikes can inhibit one half of the TRIAC from keeping on If
the spike potential exceeds the inhibit voltage of the zero
cross detection circuit, even if the LED drive current I
This hold-off condition can be eliminated by using a snubber
and also by providing a higher level of LED drive current. The
higher LED drive provides a larger photocurrent which
causes the triac to turn-on before the commutating spike
has activated the zero cross detection circuit. Fig. 14 shows
the relationship of the LED current 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 without the snubber to dump the
spike.
www.vishay.com
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crq
21607
), the triac may resume conduction even if the
F
is off and control is lost.
Resistive load
For technical questions, contact:
Commutating dV/dt
I
F(on)
Fig. 12 - Waveforms of Resistive and Inductive Loads
Crossing, High dV/dt, Low Input Current
Optocoupler, Phototriac Output, Zero
F
I
F(off)
AC line
voltage
Voltage
across triac
AC current
through
triac
is on.
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Fig. 11 - Normalized LED Trigger Current vs. Power Factor
iil410_02
Fig. 10 - Shunt Capacitance vs. Load Current
iil410_01
0.001
Inductive load
0.01
0.8
2.0
1.8
1.6
1.4
1.2
1.0
0.1
1
0.0
0
C
Commutating dV/dt
s
(µF) = 0.0032 (µF)*10^0.0066 I
50
0.2
I
I
Fth
L
100
- Load Current (mA
Normalized to I
PF - Power Factor
0.4
I
150
F(on)
T A = 25 °C, PF = 0.3
I F = 2.0 mA
200
0.6
T
A
Document Number: 83627
250
Fth
= 25 °C
0.8
I
F(off)
AC line
voltage
Voltage
across triac
AC current
through
triac
at PF = 1.0
300
RMS
Rev. 1.9, 29-Oct-10
1.0
)
L
350
(mA)
400
1.2