Data Sheet

©2005 Fairchild Semiconductor Corporation www.fairchildsemi.com
MOC303XM, MOC304XM Rev. 1.6 7
MOC303XM, MOC304XM — 6-Pin DIP Zero-Cross Triac Driver Output Optocoupler (250/400 Volt Peak)
Typical circuit (Fig 14, 15) 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.
R
in
is calculated so that I
F
is equal to the rated I
FT
of the part, 5mA for the MOC3033M and MOC3043M, 10mA for the
MOC3032M and MOC3042M, or 15mA for the MOC3031M and MOC3041M. The 39 ohm 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
used.
Figure 11. Static dv/dt Test Circuit
Figure 12. Static dv/dt Test Waveform
(MOC3031M, MOC3032M, MOC3033M)
Vdc
+400 for MOC304XM
+250 for MOC303XM
R = 10 kΩ
C
TEST
X100
SCOPE
PROBE
PULSE
INPUT
MERCURY
WETTED
RELAY
158 V
0 VOLTS
APPLIED VOLTAGE
WAVEFORM
V
max
= 250 V
dv/dt =
0.63 V
max
=
158
R
TEST
D.U.T.D.U.T.
τ
τ
τ
τ
RC
RC
RC
Figure 13. Static dv/dt Test Waveform
(MOC3041M, MOC3042M, MOC3043M)
252 V
0 VOLTS
APPLIED VOLTAGE
WAVEFORM
V
max
= 400 V
dv/dt =
0.63 V
max
=
252
RC
τ
RC
RC
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 R
TEST
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.
Figure 14. Hot-Line Switching Application Circuit
(MOC3031M, MOC3032M, MOC3033M)
0.01
V
CC
R
in
1
2
3
6
5
4
115 VAC
HOT
NEUTRAL
180Ω
*
For highly inductive loads (power factor < 0.5), change this value to 360 ohms.
1 k
MOC3031M
MOC3032M
MOC3033M
39Ω
*
LOAD
Figure 15. Hot-Line Switching Application Circuit
(MOC3041M, MOC3042M, MOC3043M)
0.01
V
CC
R
in
1
2
3
6
5
4
240 VAC
HOT
NEUTRAL
360Ω
*
For highly inductive loads (power factor < 0.5), change this value to 360 ohms.
330
MOC3041M
MOC3042M
MOC3043M
39Ω
*
LOAD