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IL4116-X009 Datasheet(PDF) 5 Page - Vishay Siliconix |
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IL4116-X009 Datasheet(HTML) 5 Page - Vishay Siliconix |
5 / 8 page Document Number: 83628 For technical questions, contact: optocoupler.answers@vishay.com www.vishay.com Rev. 1.6, 09-Jan-08 5 IL4116/IL4117/IL4118 Optocoupler, Phototriac Output, Zero Crossing, High dV/dt, Very Low Input Current Vishay Semiconductors Power Factor Considerations A snubber isn’t needed to eliminate false operation of the TRIAC driver because of the IL4116/IL4117/IL4118 high static and commutating 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 an 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 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 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. Fig. 7 - Shunt Capacitance vs. Load Current vs. Power Factor Fig. 8 - Normalized LED Trigger Current iil4116_07 400 350 300 250 200 150 100 50 0 I - Load Current (mA) L 0.001 0.01 0.1 1 C (µF) = 0.0032 (µF) x 10 ^ (0.0066 I (mA)) S L PF = 0.3 IF = 2.0 mA iil4116_08 1.2 1.0 0.8 0.6 0.4 0.2 0 PF - Power Factor 0.8 1.2 1.6 2.0 1.0 1.4 1.8 I Normalized to I at PF = 1.0 Fth Fth |
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