Analog Line Cards
Figure 3.25 shows protection of a SLIC using 20 ꢂ series resistors on both Tip and Ring in
addition to Teccor’s Battrax (B1100CC) and a diode bridge (General Semiconductor part
number EDF1BS). However, the overshoot caused by the diode bridge must be considered.
The series resistance (a minimum of 20 ꢂ on Tip and 20 ꢂ on Ring) limits the simultaneous
surge currents of 100 A from Tip to Ground and 100 A from Ring to Ground (200 A total) to
within the surge current rating of the SA-rated SIDACtor device and Battrax. The diode
bridge shunts all positive voltages to Ground, and the B1100CC shunts all negative
voltages greater than |-VREF -1.2 V| to Ground.
-V
REF
0.1 µF
F0500T
20 Ω
Tip
P3100SA
R
E
L
S
L
I
EDF1BS
A
Y
B1100CC
C
P3100SA
Ring
20 Ω
F0500T
Figure 3.25 SLIC Protection with a Single Battrax Device
© 2002 Teccor Electronics
3 - 21
http://www.teccor.com
+1 972-580-7777
®
SIDACtor Data Book and Design Guide
TECCOR [ TECCOR ELECTRONICS ]
