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IL4118 Datasheet(PDF) 3 Page - Siemens Semiconductor Group |
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IL4118 Datasheet(HTML) 3 Page - Siemens Semiconductor Group |
3 / 3 page 5–3 IL4116/4117/4118 Figure 3. Peak LED current vs. duty factor, Tau Figure 4. Maximum LED power dissipation Figure 5. On-state terminal voltage vs. terminal current Figure 6. Maximum output power dissipation Power Factor Considerations A snubber isn’t needed to eliminate false operation of the TRIAC driver because of the IL411’s high static and commutat- ing 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 com- mutating 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 optot- riac 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 pro- vides a larger photocurrent which causer. 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. Figure 7. Shunt capacitance versus load current versus power factor Figure 8. Normalized LED trigger current |
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