Analog Line Cards
In Figure 3.26 an application that requires 50 ꢂ Line Feed Resistors (LFR) uses one
B1160CC and two EDF1BS diode bridges in place of multiple SLIC protectors. The
overshoot caused by the diode bridge must be considered; however, with this approach it is
imperative that the sum of the loop currents does not exceed the Battrax’s holding current.
In the application shown in Figure 3.26, each loop current would have to be limited to
80 mA. For applications requiring the protection of four twisted pair with one Battrax, use
the B1200CC and limit each individual loop current to 50 mA.
50 Ω LFR
Tip
P3100SA
R
S
L
I
C
E
L
A
EDF1BS
Y
P3100SA
Ring
B1160CC
50 Ω LFR
50 Ω LFR
-V
REF
0.1 µF
Tip
P3100SA
P3100SA
R
E
L
A
Y
S
L
I
EDF1BS
C
Ring
50 Ω LFR
Figure 3.26 SLIC Protection with a Single Battrax Device
Figure 3.27 and Figure 3.28 show circuits that use negative Battrax devices containing an
internal diode for positive surge protection. This obviates using the discrete diodes shown in
Figure 3.24.
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© 2002 Teccor Electronics
SIDACtor Data Book and Design Guide
®
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