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BRT23H-X006 Datasheet(PDF) 4 Page - Vishay Siliconix |
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BRT23H-X006 Datasheet(HTML) 4 Page - Vishay Siliconix |
4 / 9 page www.vishay.com For technical questions, contact: optocouplers.answers@vishay.com Document Number: 83690 196 Rev. 1.5, 07-May-08 BRT21/BRT22/BRT23 Vishay Semiconductors Optocoupler, Phototriac Output, Zero Crossing Note As per IEC 60747-5-2, § 7.4.3.8.1, this optocoupler is suitable for "safe electrical insulation" only within the safety ratings. Compliance with the safety ratings shall be ensured by means of protective circuits. POWER FACTOR CONSIDERATIONS A snubber is not needed to eliminate false operation of the TRIAC driver because of the high static and commutating dV/dt with loads between 1.0 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 heldoff 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. 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 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. Fig. 1 - Shunt Capacitance vs. Load Current SAFETY AND INSULATION RATINGS PARAMETER TEST CONDITION SYMBOL MIN. TYP. MAX. UNIT Climatic classification (according to IEC 68 part 1) 40/100/21 Comparative tracking index CTI 175 399 VIOTM 6000 V VIORM 630 V PSO 200 mW ISI 400 mA TSI 175 °C Creepage distance standard DIP-6 7 mm Clearance distance standard DIP-6 7 mm Creepage distance 400 mil DIP-6 8 mm Clearance distance 400 mil DIP-6 8 mm iil410_01 400 350 300 250 200 150 100 50 0 0.001 0.01 0.1 1 IL - Load Current (mA) (RMS) Cs (µF) = 0.0032 (µF)*10^0.0066 IL (mA) Ta = 25 °C, PF = 0.3 IF = 2.0 mA |
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