PSTT PC / PSTT SC / PSTT ZC

POWERSEM GmbH, Walpersdorfer Str. 53

91126 D- Schwabach

Phone: 09122 - 9764-0 Fax.: 09122 - 9764-20

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 2006 POWERSEM reserves the right to change limits, test conditions and dimensions

Type

PSTT PC/12

PSTT PC/20

PSTT SC/12

PSTT SC/20

Parameter

Symbol

PSTT ZC/12

PSTT ZC/20

Unit

200mA gate current threshold

Vgtl

10

16

V

1.2A gate current threshold

Vgth

24

36

V

100V

2.5

1.2

A/µs

200V

3

2

A/µs

400V

4

2.5

A/µs

800V

6

3

A/µs

Gate current rise time at anode

Voltage of

1200V

(di/dt)g

4

A/µs

Peak gate current (typical)

Ip

1.3

1.3

A

Anode-cathode current at Vp

In

4.4

5.1

mA

Maximum off state gate current

Io

2*

2*

µA

Minimum control current

Icm

7

7

mA

Recommended control current

Ic

12

12

mA

Control input voltage drop at 12mA

Vin

typ. 1.2<1.5

typ. 1.2<1.5

V

Maximum reverse control input voltage

Vinr

6

6

V

Turn-on delay time at Ic=12mA

tdi

25

25

µs

Zero crossing threshold for PSTT ZC

Vzt

<20

<20

V

*PSTT ZC < 40µA

HIGHLIGHTS

Economic – very easy to use – small size – powerful gate pulse triggers large and small

thyristors. Eliminates gate drive power supply – proven reliability in harsh industrial

environment.

APPLICATION INFORMATIONS

As the gate current is derived from the anode of the thyristor, the control circuit only

needs to supply the recommended control current which can be supplied directly from

the output of many logic devices. It is advisable to maintain the control current over the

entire conduction period of the thyristor. Once the thyristor is triggered, the gate current

ceases to flow because the anode voltage drops below the threshold voltage.

The control input consists of the light emitting diode of an optocoupler. Any such optical

component is subject to aging at elevated temperatures. Although the minimum control

current Icm is well below 7mA, a 12mA control signal is recommended to ensure reliable

operation beyond 100’000 hours in a worst case design. The turn-on delay tdi can be

reduced by pulse shaping, because it is inversely proportional to the control current.

Because the device derives its power from the anode of the thyristor, a minimum

operating voltage is required before any current can flow from the anode to the gate.

This threshold voltage limits the minimum regulated output voltage. For example for a

single-phase 115V ac controller triggered by a 1200V unit it is below 0.12%. For a 400V

supply it is much less and can safely be neglected in most applications.