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BRT22M Datasheet(PDF) 4 Page - Vishay Siliconix |
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BRT22M Datasheet(HTML) 4 Page - Vishay Siliconix |
4 / 9 page www.vishay.com 4 Document Number 83690 Rev. 1.4, 10-Jan-05 BRT21/ 22/ 23 Vishay Semiconductors Coupler Power Factor Considerations A snubber isn’t needed to eliminate false operation of the TRIAC driver because of the high static and com- mutating 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 com- mutating 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 cur- rent. The hold-off condition also can be eliminated by pro- viding a higher level of LED drive current. The higher LED drive provides a larger photocurrent which causes the phototransistor to turn-on before the com- mutating 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. Parameter Test condition Symbol Min Typ. Max Unit Critical rate of rise of coupled input/output voltage IT = 0 A, VRM = VDM = VD(RMS) dvIO/dt 10000 V/ µs Common mode coupling capacitance CCM 0.01 pF Capacitance (input-output) f = 1.0 MHz, VIO = 0 V CIO 0.8 pF Isolation resistance VIO = 500 V, Tamb = 25 °C Ris ≥ 1012 Ω VIO = 500 V, Tamb = 100 °C Ris ≥ 1011 Ω Trigger current VD = 5.0 V, F - Versions IFT 1.2 mA VD = 5.0 V, H - Versions IFT 2.0 mA VD = 5.0 V, M - Versions IFT 3.0 mA Figure 1. Shunt Capacitance vs. Load Current iil410_01 400 350 300 250 200 150 100 50 0 .001 .01 .1 1 IL - Load Current - mA(RMS) Cs( µF) = 0.0032 (µF)* 10^(0.0066IL (mA) Ta = 25°C, PF = 0.3 IF = 2.0 mA |
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