TISP61089BSD Bourns, Inc., TISP61089BSD Datasheet - Page 6

• Manufacturer Part Number: TISP61089BSD
• Description: Dual Forward-conducting P-gate Thyristors Programmable Overvoltage Protectors
• Manufacturer: Bourns, Inc.

Figure 4 shows a typical powering arrangement for a multi-supply rail SLIC. V
switch S1 in the position shown, the line driver amplifiers are powered between 0 V and V
for short loop transmission. For long loops and to generate ringing, the driver voltage is increased by operating S1 to connect V
conditions are shown in Figure 5.
Conventional ringing is typically unbalanced ground or battery backed. To minimize the supply voltage required, most multi-rail SLICs use
balanced ringing as shown in Figure 5. The ringing has d.c., V
has a peak value, V
internal losses in the SLIC from ground, V
10 V. This makes a total, V
In some cases a trapezoidal a.c. ring signal is used. This would have a peak to r.m.s ratio (crest factor) of about 1.25, increasing the r.m.s. a.c.
ring level by 13 %. The d.c. ring voltge may be lowered for short loop applications.
Operation of Ringing SLICs using Multiple Negative Voltage Supply Rails
TISP61089BSD High Voltage Ringing SLIC Protector
SHORT LOOP
PKRING
BATH
, of 99 V. If the d.c. component was 20 V, then the total voltage swing needed would be 99 + 20 = 119 V. There are
, supply rail value of 119 + 10 = 129 V.
0 V
V
BATL
SLICG
Figure 4. SLIC with Voltage Supply Switching
LONG LOOP
LINE
, and the negative supply, V
Figure 5. Driver Supply Voltage Levels
APPLICATIONS INFORMATION
DRIVERS
LINE
DCRING
0 V
V
BATH
SLIC
, and a.c., V
SLICH
V
SUPPLY
SWITCH
DCRING
BATL
S1
. The sum of these two losses generally amounts to a total of
PKRING
Customers should verify actual device performance in their specific applications.
is a lower (smaller) voltage supply than V
V
V
, components. A 70 V r.m.s. a.c. sinusoidal ring signal
BATL
PKRING
PKRING
AI6XCC
0 V
V
V
BATL
BATH
. This mode minimizes the power consumption
/2
/2
RINGING
V
Specifications are subject to change without notice.
V
SLICH
SLICG
V
V
PKRING
PKRING
/2
/2
SEPTEMBER 2005 - REVISED MAY 2007
BATH
AI6XCD
BATH
. With supply
V
BATH
. These
0 V
V
BATH