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MOC3051TV-M Datasheet(PDF) 5 Page - Fairchild Semiconductor |
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MOC3051TV-M Datasheet(HTML) 5 Page - Fairchild Semiconductor |
5 / 11 page 6/15/05 Page 5 of 11 © 2005 Fairchild Semiconductor Corporation 6-PIN DIP RANDOM-PHASE OPTOISOLATORS TRIAC DRIVERS (600 VOLT PEAK) MOC3051-M MOC3052-M Minimum LED Off Time in Phase Control Applications In Phase control applications one intends to be able to control each AC sine half wave from 0 to 180 degrees. Turn on at zero degrees means full power and turn on at 180 degree means zero power. This is not quite possible in reality because triac driver and triac have a fixed turn on time when activated at zero degrees. At a phase control angle close to 180 degrees the driver’s turn on pulse at the trailing edge of the AC sine wave must be limited to end 200 ms before AC zero cross as shown in Figure 5. This assures that the triac driver has time to switch off. Shorter times may cause loss of control at the following half cycle. IFT versus dv/dt Triac drivers with good noise immunity (dv/dt static) have inter- nal noise rejection circuits which prevent false triggering of the device in the event of fast raising line voltage transients. Induc- tive loads generate a commutating dv/dt that may activate the triac drivers noise suppression circuits. This prevents the device from turning on at its specified trigger current. It will in this case go into the mode of “half waving” of the load. Half waving of the load may destroy the power triac and the load. Figure 8 shows the dependency of the triac drivers IFT versus the reapplied voltage rise with a Vp of 400 V. This dv/dt condi- tion simulates a worst case commutating dv/dt amplitude. It can be seen that the IFT does not change until a commutat- ing dv/dt reaches 1000 V/ms. The data sheet specified IFT is therefore applicable for all practical inductive loads and load factors. Figure. 7 Leakage Current, I DRM vs. Temperature TA , AMBIENT TEMPERATURE ( oC) -40 -20 0 20 40 60 80 100 0.1 1 10 100 1000 10000 Figure 5. Minimum Time for LED Turn–Off to Zero Cross of AC Trailing Edge AC SINE 0 ϒ 180 ° LED PW LED CURRENT LED TURN OFF MIN 200 µs Figure. 6 Holding Current, I H vs. Temperature TA, AMBIENT TEMPERATURE ( oC) -40 1 0.9 0 -30 - 20 -10 0 10 20 30 4050607080 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 dv/dt (V/ µs) 0.001 1.5 0.5 10000 NORMALIZED TO: IFT at 3 V 1.4 1.3 1.2 1.1 1 0.9 0.8 0.7 0.6 0.01 0.1 1 10 100 1000 Figure. 8 LED Trigger Current, I FT vs. dv/dt |
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