MOC3051SM View Datasheet(PDF) - Fairchild Semiconductor
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MOC3051SM Datasheet PDF : 11 Pages
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6-PIN DIP RANDOM-PHASE
OPTOISOLATORS TRIAC DRIVERS
(600 VOLT PEAK)
MOC3051-M
MOC3052-M
Figure. 1 LED Forward Voltage vs. Forward Current
1.8
1.7
1.6
1.5
1.4
TA = -55oC
1.3
TA = 25oC
1.2
TA = 100oC
1.1
1.0
1
10
100
IF - LED FORWARD CURRENT (mA)
Figure. 2 On-State Characteristics
800
600
400
200
0
-200
-400
-600
-800
-3
-2
-1
0
1
2
3
ON-STATE VOLTAGE - VTM (V)
Figure. 3 Trigger Current vs. Ambient Temperature
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
NORMALIZED TO TA = 25°C
0.6
-40
-20
0
20
40
60
80
100
AMBIENT TEMPERATURE - TA (oC)
IF versus Temperature (normalized)
This graph (figure 3) shows the increase of the trigger current
when the device is expected to operate at an ambient tempera-
ture below 25°C. Multiply the normalized IFT shown this graph
with the data sheet guaranteed IFT.
Example:
TA = -40°C, IFT = 10 mA
IFT @ -40°C = 10 mA x 1.4 = 14 mA
Phase Control Considerations
LED Trigger Current versus PW (normalized)
Random Phase Triac drivers are designed to be phase control-
lable. They may be triggered at any phase angle within the AC
Figure. 4 LED Current Required to Trigger vs. LED Pulse Width
25
NORMALIZED TO:
20
PWin ≥ 100 µs
15
10
5
0
1
2
5
10
20
50
100
PWin, LED TRIGGER PULSE WIDTH (µs)
sine wave. Phase control may be accomplished by an AC line
zero cross detector and a variable pulse delay generator which
is synchronized to the zero cross detector. The same task can
be accomplished by a microprocessor which is synchronized
to the AC zero crossing. The phase controlled trigger current
may be a very short pulse which saves energy delivered to the
input LED. LED trigger pulse currents shorter than 100 µs must
have an increased amplitude as shown on Figure 4. This graph
shows the dependency of the trigger current IFT versus the
pulse width can be seen on the chart delay t(d) versus the LED
trigger current.
IFT in the graph IFT versus (PW) is normalized in respect to the
minimum specified IFT for static condition, which is specified in
the device characteristic. The normalized IFT has to be multi-
plied with the devices guaranteed static trigger current.
Example:
Guaranteed IFT = 10 mA, Trigger pulse width PW = 3 µs
IFT (pulsed) = 10 mA x 5 = 50 mA
© 2004 Fairchild Semiconductor Corporation
Page 4 of 11
9/2/04
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