Datasheet BRT21, BRT22, BRT23 (Vishay) - 4

BRT21, BRT22, BRT23
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SAFETY AND INSULATION RATINGS PARAMETER TEST CONDITION SYMBOL VALUE UNIT
Climatic classification According to IEC 68 part 1 40 / 100 / 21 Pollution degree According to DIN VDE 0109 2 Comparative tracking index Insulation group IIIa CTI 175 Maximum rated withstanding isolation voltage According to UL1577, t = 1 min VISO 4420 VRMS Tested withstanding isolation voltage According to UL1577, t = 1 s VISO 5300 VRMS Maximum transient isolation voltage According to DIN EN 60747-5-5 VIOTM 6000 Vpeak Maximum repetitive peak isolation voltage According to DIN EN 60747-5-5 VIORM 630 Vpeak VIO = 500 V, Tamb = 25 °C RIO ≥ 1012 Ω Isolation resistance VIO = 500 V, Tamb = 100 °C RIO ≥ 1011 Ω Output safety power PSO 200 mW Input safety current ISI 400 mA Input safety temperature TS 175 °C Creepage distance DIP-6; SMD-6, option 7; ≥ 7 mm SMD-6 option 9 Clearance distance ≥ 7 mm Creepage distance ≥ 8 mm DIP-6, option 6; SMD-6, option 8 Clearance distance ≥ 8 mm Insulation thickness DTI ≥ 0.4 mm
Note
• As per IEC 60747-5-5, § 7.4.3.8.2, 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 1 C dV/dt with loads between 1.0 and 0.8 power factors. When s (µF) = 0.0032 (µF) x 100.0066 IL (mA) inductive loads with power factors less than 0.8 are being driven, include a RC snubber or a single capacitor directly 0.1 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. 0.01 But in the case of a zero voltage crossing optotriac, the - Shunt Capacitance (µF) s T = 25 °C, PF = 0.3, commutating dV/dt spikes can inhibit one half of the TRIAC C amb I = 2.0 mA F from turning on. If the spike potential exceeds the inhibit 0.001 voltage of the zero cross detection circuit, half of the TRIAC 0 50 100 150 200 250 300 350 400 will be heldoff and not turn-on. This hold-off condition can iil410_01 IL - Load Current (mA ) RMS be eliminated by using a snubber or capacitor placed directly across the optotriac as shown in figure 1. Note that Fig. 1 - Shunt Capacitance vs. Load Current 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. Rev. 2.1, 21-Jun-2023
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