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MOC3083M Datasheet(PDF) 7 Page - Fairchild Semiconductor |
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MOC3083M Datasheet(HTML) 7 Page - Fairchild Semiconductor |
7 / 11 page ©2005 Fairchild Semiconductor Corporation www.fairchildsemi.com MOC3081M, MOC3082M, MOC3083M Rev. 1.0.3 7 1. The mercury wetted relay provides a high speed repeated pulse to the D.U.T. 2. 100x scope probes are used, to allow high speeds and voltages. 3. The worst-case condition for static dv/dt is established by triggering the D.U.T. with a normal LED input current, then removing the current. The variable RTEST allows the dv/dt to be gradually increased until the D.U.T. continues to trigger in response to the applied voltage pulse, even after the LED current has been removed. The dv/dt is then decreased until the D.U.T. stops triggering. τ RC is measured at this point and recorded. Typical circuit for use when hot line switching is required. In this circuit the “hot” side of the line is switched and the load connected to the cold or neutral side. The load may be connected to either the neutral or hot line. Rin is calculated so that IF is equal to the rated IFT of the part, 15mA for the MOC3081M, 10mA for the MOC3082M, and 5mA for the MOC3083M. The 39 Ω resistor and 0.01µF capacitor are for snubbing of the triac and may or may not be necessary depending upon the particular triac and load use. Suggested method of firing two, back-to-back SCR’s with a Fairchild triac driver. Diodes can be 1N4001; resistors, R1 and R2, are optional 330 Ω. Note: This optoisolator should not be used to drive a load directly. It is intended to be a trigger device only. Figure 11. Hot-Line Switching Application Circuit 0.01 VCC Rin 1 2 3 6 5 4 240 VAC HOT FKPF12N80 NEUTRAL 360 Ω * For highly inductive loads (power factor < 0.5), change this value to 360 Ω. 330 Ω MOC3081M MOC3082M MOC3083M 39* LOAD Figure 12. Inverse-Parallel SCR Driver Circuit VCC Rin 1 2 3 6 5 4 240 VAC SCR 360 Ω R1 D1 SCR MOC3081M MOC3082M MOC3083M R2 D2 LOAD Figure 9. Static dv/dt Test Circuit Vdc 800V 10 k Ω CTEST X100 SCOPE PROBE PULSE INPUT MERCURY WETTED RELAY RTEST D.U.T. D.U.T. Figure 10. Static dv/dt Test Waveform 504 V 0 VOLTS APPLIED VOLTAGE WAVEFORM Vmax = 800 V dv/dt = 0.63 Vmax = 504 tRC tRC tRC |
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