PP0901SA(1998) データシートの表示（PDF） - ProTek Devices.
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PP0901SA Datasheet PDF : 4 Pages
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Fuse
TIP
RING
Application Notes for Thyristor Surge Suppressors
used in Telecommunication Circuits
FIGURE 8 - UL 1459 & FCC Part 68 Metallic Protection
RTip
The TSS device is located across the tip-to-ring line after a limiting
resistor and fuse combination. RTIP and RRING resistors are optional
depending upon the TSS device selection. Without the resistors, the
To
Protected
Equipment
PP3100SB/SC is recommended. However, with a resistance value of
7.5 ohms for tip and ring, the PP3100SA is recommended. Digital
signals may use a lower TSS device depending upon the total tip to
ring voltage range. Selection of the TSS device, either PPxxxxSA or
SB/SC is based upon the value of the tip and ring resistors. For the
RRing
National Electronic Code (NEC) article 800, it is recommended that at
least one fuse be used in the tip or ring line for metallic surges. Fuses
may be replaced with a suitable Positive Temperature Coefficient
(PTC) automatic resettable current limiting device.
FIGURE 9 - UL 1459 & FCC Part 68 - Longitudinal Protection
RTip
There are two TSS devices, one located from tip-to-ground and one ring- TIP
to-ground. For standard analog signals, the PP3100SA is recommended
with a typical resistor value for tip and ring of 15 ohms. The PP3100SB/
SC is recommended for resistor values of 7.5 ohms each. The National
Electric Code (NEC) article 800 requires two fuse elements when
connecting to ground. Fuses or a suitable Positive Temperature Coeffi-
cient (PTC) automatic resettable current limiting device may be used.
The purpose of this circuit is to limit AC power current from getting on the
ground line causing any safety hazard.
RING
RRing
To
Protected
Equipment
FIGURE 10 - UL 1459 & FCC Part 68 - Metallic and Longitudinal Protection
RTip
TIP
To
Protected
Equipment
Three equal TSS devices are used in this application for metallic (tip-
to-ring) and longitudinal (tip-to-ground and ring-to-ground) protection.
For analog signals, the PP3100SB/SC is recommended. With a
resistance value of 15 ohms for the tip and ring resistors, the
PP3100SA may be used. The National Electric Code (NEC) article
800 requires two fuse elements when connecting to ground. Fuses or
a suitable Positive Temperature Coefficient (PTC) automatic resettable
current limiting device may be used. This is circuit is recommended
for protection against the Bellcore requirement: First Level Lightning
Surge Tests (Telecommunications Port), document # GR-1089-CORE.
RING
RRing
®
4
5081.R1 9/98
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