AT404 ETC2 [List of Unclassifed Manufacturers], AT404 Datasheet

AT404

Manufacturer Part Number

AT404

Description

EZYTRIGGER

Manufacturer

ETC2 [List of Unclassifed Manufacturers]

Datasheet

1.AT404.pdf (2 pages)

Current page: 1 of 2
Download datasheet (117Kb)

AT404 E

April 2002

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.

ABSOLUTE MAXIMUM RATINGS

TECHNICAL DATA

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

Peak voltage - positive and negative

Nominal mains voltage

Continuous DC voltage

Turn-on delay for gate current = 1A

Transient immunity

Ambient temperature

External gate cathode short circuit during operation can be destructive

200mA Gate current threshold

1.2A gate current threshold

Gate current rise time at anode

voltage of

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

Parameter

at 25°C

RIGGER

1200V

100V

200V

400V

800V

Data subject to change without notice

Symbol

(di/dt)g

Vgtm

Vcm

Vgtl

Icm

(dv/dt)d

tdi

tdg

AT404-22

1.2

2.5

1.3

5.1

2200

2000

690

-25 to +85

AT404

AT404-24

1.2

2.5

1.3

5.8

2400

2000

690

Actual Size

Page 1 of 2

Vrms

V/ s

A/ s

Unit

Vdc

ºC

Related parts for AT404

AT404 Summary of contents

Page 1

... Turn-on delay with receiver current = 30uA APPLICATION INFORMATION The sensitivity of the fibre optic system is important 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 ...

Page 2

... T ZY RIGGER minimum of about 5µS. The printed circuit board tracks from the fibre optic receiver to the AT404 EasyTrigger need short as possible. Furthermore the (+) track should preferably surround the (-) track to minimize capacitive interference from fast rising voltages in the vicinity. Since the gate current is derived from the anode of the thyristor no gate drive power supply is required ...

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