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MOC3051 Datasheet(PDF) 5 Page - Motorola, Inc

Part No. MOC3051
Description  6-Pin DIP Random-Phase Optoisolators Triac Drivers
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Manufacturer  MOTOROLA [Motorola, Inc]
Direct Link  http://www.freescale.com
Logo MOTOROLA - Motorola, Inc

MOC3051 Datasheet(HTML) 5 Page - Motorola, Inc

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MOC3051 MOC3052
5
Motorola Optoelectronics Device Data
TYPICAL ELECTRICAL CHARACTERISTICS
TA = 25°C
Figure 9. Delay Time, t(d), and Fall Time, t(f),
versus LED Trigger Current
IFT, LED TRIGGER CURRENT (mA)
100
0.1
10
20
30
40
50
60
10
1
t(f)
t(d)
t(delay), t(f) versus IFT
The triac driver’s turn on switching speed consists of a turn
on delay time t(d) and a fall time t(f). Figure 9 shows that the
delay time depends on the LED trigger current, while the ac-
tual trigger transition time t(f) stays constant with about one
micro second.
The delay time is important in very short pulsed operation
because it demands a higher trigger current at very short trig-
ger pulses. This dependency is shown in the graph IFT ver-
sus LED PW.
The turn on transition time t(f) combined with the power
triac’s turn on time is important to the power dissipation of
this device.
Switching Time Test Circuit
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.
Figure 10. Static dv/dt Test Circuit
+400
Vdc
PULSE
INPUT
RTEST
CTEST
R = 1 k
MERCURY
WETTED
RELAY
D.U.T.
X100
SCOPE
PROBE
APPLIED VOLTAGE
WAVEFORM
Vmax = 400 V
dv/dt =
0.63 Vmax
τRC
252
τRC
=
τRC
252 V
0 VOLTS
SCOPE
IFT
VTM
t(d)
t(f)
ZERO CROSS
DETECTOR
EXT. SYNC
Vout
FUNCTION
GENERATOR
PHASE CTRL.
PW CTRL.
PERIOD CTRL.
Vo AMPL. CTRL.
IFT
VTM
10 k
DUT
100
ISOL. TRANSF.
AC
115 VAC


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