IL4116-X007 查看數據表（PDF） - Vishay Semiconductors

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IL4116-X007

Optocoupler, Phototriac Output, Zero Crossing, High dV/dt, Very Low Input Current

Vishay Semiconductors 

IL4116/IL4117/IL4118

Optocoupler, Phototriac Output, Vishay Semiconductors

Zero Crossing, High dV/dt, Very Low

Power Factor Considerations

Input Current

A snubber isn’t needed to eliminate false operation of the

2.0

TRIAC driver because of the IL4116/IL4117/IL4118 high

static and commutating dV/dt with loads between 1 and 0.8

1.8

power factors. When inductive loads with power factors less

than 0.8 are being driven, include an RC snubber or a single

1.6

capacitor directly across the device to damp the peak

commutating dV/dt spike. Normally a commutating dV/dt

1.4

causes a turning-off device to stay on due to the stored

energy remaining in the turn-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 7. Note that the value

of the capacitor increases as a function of the load current.

The hold-off condition also can be eliminated by providing a

higher level of LED drive current. The higher LED drive

provides a larger photocurrent which causes. The

phototransistor to turn-on before the commutating spike has

1.2

IFth Normalized to IFth at PF = 1.0

1.0

0.8

0

0.2 0.4 0.6 0.8 1.0 1.2

iil4116_08

PF - Power Factor

Fig. 8 - Normalized LED Trigger Current

activated the zero cross network. Figure 8 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.

1

CS (µF) = 0.0032 (µF) x 10 ^ (0.0066 IL(mA))

0.1

0.01

PF = 0.3

IF = 2.0 mA

0.001

0

iil4116_07

50 100 150 200 250 300 350 400

IL - Load Current (mA)

Fig. 7 - Shunt Capacitance vs. Load Current vs. Power Factor

Document Number: 83628

Rev. 1.6, 09-Jan-08

For technical questions, contact: optocoupler.answers@vishay.com

www.vishay.com

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