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61089B

High Voltage Ringing SLIC Protector

Unspecified 

TISP61089B High Voltage Ringing SLIC Protector

SLIC Parameter Values

The table below shows some details of HV SLICs using multiple negative supply rails.

Manufacturer

INFINEON‡

LEGERITY™‡

Unit

SLIC Series

SLIC-P‡

ISLIC™‡

SLIC #

PEB 4266

79R241

79R101

79R100

Data Sheet Issue

14/02/2001

-/08/2000

-/07/2000

-/07/2000

Short Circuit Current

110

150

150

150

mA

VBATH max.

VBATL max.

AC Ringing for:

-155

-150

85

-104

-104

45†

-104

V BATH

50†

-104

VBATH

55†

V

V

V rms

Crest Factor

1.4

1.4

1.4

1.25

VBATH

-70

-90

-99

-99

V

VBATR

-150

-36

-24

-24

V

R or T Power Max. < 10 ms

10

W

R or T Overshoot < 10 ms TBD

TBD

-5

5

-10

5

-10

5

V

R or T Overshoot < 1 ms -10

+10

V

R or T Overshoot < 1 µs

-10

+30

-10

10

-15

8

-15

8

V

R or T Overshoot < 250 ns

-15

15

-20

12

-20

12

V

Line Feed Resistance

20 + 30

50

50

50

Ω

† Assumes -20 V battery voltage during ringing.

‡ Legerity, the Legerity logo and ISLIC are the trademarks of Legerity, Inc. (formerly AMD’s Communication Products Division).

Other product names used in this publication are for identification purposes only and may be trademarks of their respective

companies.

From the table, the maximum supply voltage, VBATH, is -155 V. In terms of minimum voltage overshoot limits, -10 V and +8 V are needed for

1 µs and -15 V, +12 V are needed for 250 ns. To maintain these voltage limits over the temperature range, 25 °C values of -12 V, +10 V are

needed for 250 ns.

It is important to define the protector overshoot under the actual circuit current conditions. For example, if the series line feed resistor was

40 Ω, R1 in Figure 12, and Telcordia GR-1089-CORE 2/10 and 10/1000 first-level impulses were applied, the peak protector currents would be

56 A and 20 A. At the second-level, the 2/10 impulse current would be 100 A. Therefore, the protector voltage overshoot should be guaranteed

to not exceed the SLIC voltage ratings at 100 A, 2/10 and 20 A, 10/1000. In practice, as the 2/10 waveshape has the highest current (100 A)

and fastest di/dt (80 A/µs) the overshoot level testing can restricted to the be 2/10 waveshape.

Using the table values for maximum battery voltage and minimum overshoot gives a protection device requirement of -170 V and +12 V from

the output to ground. There needs to be temperature guard banding for the change in protector characteristics with temperature. To cover

down to -40 °C, the 25 °C protector minimum values become -185 V (VDRM) on the cathode and -182 V (VGKS) on the gate.

Gated Protectors

This section covers four topics. First, it is explained why gated protectors are needed. Second, the voltage limiting action of the protector is

described. Third, how the withstand voltages of the TISP61089B junctions are set. Fourth, 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.

OCTOBER 2000 - REVISED FEBRUARY 2005

Specifications are subject to change without notice.

Customers should verify actual device performance in their specific applications.

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