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MOC3052SM Datasheet(PDF) 7 Page - Fairchild Semiconductor |
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MOC3052SM Datasheet(HTML) 7 Page - Fairchild Semiconductor |
7 / 11 page 6/15/05 Page 7 of 11 © 2005 Fairchild Semiconductor Corporation 6-PIN DIP RANDOM-PHASE OPTOISOLATORS TRIAC DRIVERS (600 VOLT PEAK) MOC3051-M MOC3052-M APPLICATIONS GUIDE Basic Triac Driver Circuit The new random phase triac driver family MOC3052-M and MOC3051-M are very immune to static dv/dt which allows snubberless operations in all applications where external generated noise in the AC line is below its guaranteed dv/dt withstand capability. For these applications a snubber circuit is not necessary when a noise insensitive power triac is used. Figure 11 shows the circuit diagram. The triac driver is directly connected to the triac main terminal 2 and a series Resistor R which limits the current to the triac driver. Current limiting resistor R must have a minimum value which restricts the current into the driver to maximum 1A. R = Vp AC/ITM max rep. = Vp AC/1A The power dissipation of this current limiting resistor and the triac driver is very small because the power triac carries the load current as soon as the current through driver and current limiting resistor reaches the trigger current of the power triac. The switching transition times for the driver is only one micro second and for power triacs typical four micro seconds. Triac Driver Circuit for Noisy Environments When the transient rate of rise and amplitude are expected to exceed the power triacs and triac drivers maximum ratings a snubber circuit as shown in Figure 12 is recommended. Fast transients are slowed by the R-C snubber and excessive amplitudes are clipped by the Metal Oxide Varistor MOV. Triac Driver Circuit for Extremely Noisy Environments, as specified in the noise standards IEEE472 and IEC255-4. Industrial control applications do specify a maximum transient noise dv/dt and peak voltage which is superimposed onto the AC line voltage. In order to pass this environment noise test a modified snubber network as shown in Figure 13 is recom- mended. Figure 11. Basic Driver Circuit Figure 12. Triac Driver Circuit for Noisy Environments Figure 13. Triac Driver Circuit for Extremely Noisy Environments VCC RET. RLED TRIAC DRIVER POWER TRIAC AC LINE LOAD R Q CONTROL R TRIAC DRIVER POWER TRIAC RLED VCC RET. CONTROL RS CS MOV LOAD AC LINE R TRIAC DRIVER POWER TRIAC RS CS MOV LOAD AC LINE VCC RET. CONTROL RLED RLED = (VCC - V F LED - V sat Q)/IFT R = Vp AC line/ITSM Typical Snubber values RS = 33 Ω, CS = 0.01 µF MOV (Metal Oxide Varistor) protects triac and driver from transient overvoltages >VDRM max. Recommended snubber to pass IEEE472 and IEC255-4 noise tests RS = 47 W, CS = 0.01 mF |
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