AT404 Datasheet, PDF (1/2 Pages) List of Unclassifed Manufacturers – EZYTRIGGER

AT404 EZYTRIGGER
The AT404 EasyTrigger in combination with a fibre optic
cable replaces pulse transformers including all associated
circuitry in phase controlled thyristor equipment. It is
intended for applications where high insulation voltages or
long transmitting distances are important. Because of the
small control current, the unit serves as an ideal link
between the control intelligence and the thyristor. Each unit
triggers a single thyristor and is intended for 115 -
690Vrms supplies.
The operation of the AT404 is based on a controlled
current source connected between anode and gate of the
thyristor to be triggered. The large gate current is initiated
by the output current from a fibre optic receiver diode. With
a suitable transmitter, small and large thyristors can be
triggered directly from standard logic circuits without the
need of a gate drive power supply. The receiver diode is
not part of the unit.
Among the many possible applications, it is specifically
useful in electrostatic precipitators.
AT404
Actual Size
ABSOLUTE MAXIMUM RATINGS
Parameter
Symbol
AT404-22
Peak voltage - positive and negative
Vp
2200
Nominal mains voltage
Vm
690
Continuous DC voltage
V=
690
Turn-on delay for gate current = 1A
tdg
5
Transient immunity
(dv/dt)d
2000
Ambient temperature
Ta
External gate cathode short circuit during operation can be destructive
AT404-24
2400
690
690
5
2000
-25 to +85
TECHNICAL DATA at 25°C
Parameter
200mA Gate current threshold
1.2A gate current threshold
Gate current rise time at anode
100V
voltage of
200V
400V
800V
1200V
Peak gate current (typical)
Anode - cathode current at Vp
Maximum off state gate current
Minimum output current of receiver diode
Minimum voltage rating of receiver diode
Turn-on delay with receiver current = 30uA
Symbol
Vgtl
Vgtm
(di/dt)g
Ip
In
Io
Icm
Vcm
tdi
AT404-22
16
36
1.2
2
2.5
3
4
1.3
5.1
2
15
30
35
AT404-24
16
36
1.2
2
2.5
3
4
1.3
5.8
2
15
30
35
Unit
V
Vrms
Vdc
s
V/ s
ºC
Unit
V
V
A/ s
A
mA
A
A
V
s
APPLICATION INFORMATION
The sensitivity of the fibre optic system is important if it is desirable to drive the AT404 directly from the
control logic. For a receiver diode output above 30µA the turn-on delay is approximately inversely
proportional to the current and therefore pulse shaping can reduce the turn-on delay down to a
April 2002
Data subject to change without notice
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