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MOC3081M Datasheet(PDF) 6 Page - Fairchild Semiconductor

Part No. MOC3081M
Description  6-PIN DIP ZERO-CROSS OPTOISOLATORS TRIAC DRIVER OUTPUT (800 VOLT PEAK)
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Maker  FAIRCHILD [Fairchild Semiconductor]
Homepage  http://www.fairchildsemi.com
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 6 page
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4/14/03
Page 6 of 11
© 2003 Fairchild Semiconductor Corporation
6-PIN DIP ZERO-CROSS
OPTOISOLATORS TRIAC DRIVER OUTPUT
(800 VOLT PEAK)
MOC3081M
MOC3082M
MOC3083M
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.
τRC 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, 15 mA for the MOC3081M, 10 mA for the MOC3082M, and 5 mA for
the MOC3083M. The 39 ohm resistor and 0.01 µF capacitor are for snubbing of the triac and may or may not be necessary
depending upon the particular triac and load use.
Figure 9. Static dv/dt Test Circuit
Vdc
800V
10 k
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
τRC
τRC
τRC
Figure 11. Hot-Line Switching Application Circuit
0.01
VCC
Rin
1
2
3
6
5
4
240 VAC
HOT
FKPF12N80
NEUTRAL
360
* For highly inductive loads (power factor < 0.5), change this value to 360 ohms.
330
MOC3081M
MOC3082M
MOC3083M
39*
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