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TISP61089AS

DUAL FORWARD-CONDUCTING P-GATE THYRISTORS PROGRAMMABLE OVERVOLTAGE PROTECTORS

Power Innovations 

TISP61089AS

DUAL FORWARD-CONDUCTING P-GATE THYRISTORS

PROGRAMMABLE OVERVOLTAGE PROTECTORS

OCTOBER 1999

THERMAL INFORMATION

PEAK NON-REPETITIVE ON-STATE CURRENT

vs

CURRENT DURATION

TI6LAE

20

RING AND TIP TERMINALS:

15

ITSM values applied simultaneously

10

GROUND TERMINAL:

8

Current twice ITSM value

7

EIA /JESD51

6

Environment and

5

4

PCB, TA = 25 °C

3

VGG = -80 V

2

VGG = -60 V

1.5

1

0.8

0.7

0.6

0.5

0.01

VGG = -100 V

0.1

1

10

100

t — Current Duration — s

1000

Figure 2. NON-REPETITIVE PEAK ON-STATE CURRENT AGAINST DURATION

APPLICATIONS INFORMATION

gated protectors

This section covers three topics. Firstly, it is explained why gated protectors are needed. Second, the voltage

limiting action of the protector is described. Third, an example application circuit is described.

purpose of gated protectors

Fixed voltage thyristor overvoltage protectors have been used since the early 1980s to protect monolithic

SLICs (Subscriber Line Interface Circuits) against overvoltages on the telephone line caused by lightning, a.c.

power contact and induction. As the SLIC was usually powered from a fixed voltage negative supply rail, the

limiting voltage of the protector could also be a fixed value. The TISP1072F3 is a typical example of a fixed

voltage SLIC protector.

SLICs have become more sophisticated. To minimise power consumption, some designs automatically adjust

the supply voltage, VBAT, to a value that is just sufficient to drive the required line current. For short lines the

supply voltage would be set low, but for long lines, a higher supply voltage would be generated to drive

sufficient line current. The optimum protection for this type of SLIC would be given by a protection voltage

which tracks the SLIC supply voltage. This can be achieved by connecting the protection thyristor gate to the

SLIC supply, Figure 3. This gated (programmable) protection arrangement minimises the voltage stress on

the SLIC, no matter what value of supply voltage.

PRODUCT INFORMATION

5

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