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Introduction to SLIC Overvoltage
Protection Devices
2
Version01_100407
Outline
Littelfuse SLIC Protection– The SLIC & Ringing Functions– Fixed Negative Solutions
P0641SC Family
– LCAS Solutions P1200CC / P2000CC / A1220
– Negative Tracking B1101UC Family
– VoIP Solutions P0641DF-1E Family
– Positive / Negative Tracking B3104UC Family
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SLIC Overvoltage Protection SLIC & Ringing Functions
POTS (Plain Old Telephone Service) requires two distinct signal types for telephones:
Subscriber Line Interface Circuit
-48V
H.V. Ring∿∿∿∿∿
∿ Generato
r
Ring Relay
TelephoneLine
SLIC Protection
POTS Protection
SLIC provides “Off-Hook” services. Ring Generator provides high voltage
ringing signal.
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SLIC Overvoltage Protection Fixed Negative Solutions
POTS (Plain Old Telephone Service) requires two distinct signal types for telephones:
Positive Surges Taken to Ground by the Diode. Negative Surges (beyond VBO) Taken to Ground by the SIDACtor.
Subscriber Line Interface Circuit
-48V
SLIC Protection
Subscriber Line Interface Circuit
-48V
SLIC Protection
-48V
Positive Surge Pulse
Negative Surge Pulse
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SLIC Overvoltage Protection Fixed Negative Solutions – P0641SC Family
The P0641SC Family of Fixed Negative SIDACtor Solutions:
P0641CA2
VBO
SLIC A: TO-220C: CompakS: SMB PkgQ22: QFNU: MS-013
A: ITU SurgeC: GR-1089 Surge
SIDACtor
Optional Circuit Count
e.g. P0641SC
e.g. P1701AC2
e.g. P1101CA2
e.g. P0901UC
e.g. P0641Q22C
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LCAS (Solid-State Relay) Protection
LCAS (Line Circuit Access Switch) is a solid-state relay that replaces the mechanical ring relay.
Subscriber Line Interface Circuit
-48V
H.V. Ring∿∿∿∿∿
∿ Generato
r
TelephoneLine
SLIC Protection
LCAS Protection
LCAS Relays are more delicate than mechanical ring relays.
LCAS Relays require specialized VBO protection devices.
LCASTip
Ring
120V
200V or 250V
Tip
Ring
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VBO#2 10
VBO#1 10
SLIC Overvoltage Protection LCAS Solutions
Littelfuse Fixed Voltage SIDACtor Solutions:
P2500SC
VBO
Bidirectional
SMB Pkg
A: ITU SurgeB: TIA-968-A SurgeC: GR-1089 Surge
SIDACtor
e.g. P1200SC e.g. A1220UC4
A1220UC
MS-013 Pkg
A: ITU SurgeB: TIA-968-A SurgeC: GR-1089 Surge
Asymmetric SIDACtor
·l·
·l·
2 Ports per Device2 Devices per Port
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Self-Ringing SLICsBattrax® Negative Tracking Devices
Self-Ringing SLICs require protection that tracks the variable DC supply voltage:
-VVariable
DC Supply
+
TelephoneLine
Battrax Protection
Self-Ringing
SLIC
-V
Positive Surge Pulse
Negative Surge Pulse
Gate Current
Positive Surges Taken to Ground by the Diode. Negative Surges (beyond -V) Taken to Ground by the SCR.
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SLIC Overvoltage Protection Negative Tracking Battrax® Solutions
The B1101UC Family of Fixed Negative SIDACtor Solutions:
B1101UC4
SLIC MS-013
C: GR-1089 Surge
Battrax®Optional Circuit Counte.g. B1161UC
e.g. B1201UC4
IH 10
·l·
Neg Tracking
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VoIP SLICs
VoIP (Voice over Internet Protocol) SLICs create telephone lines at the customer’s premises but connect to the PSTN via an internet connection.
Subscriber Line Interface Circuit
8 – 40V
TelephoneLine
Fixed Voltage
SLIC Protection
The SLIC provides ringing signal from a low voltage battery using an integrated DC-DC converter.
The ring voltage may be software controlled, but is usually fixed for any particular application.
Therefore, fixed voltage protection is the best solution.
Integrated DC-DC
Converter
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SLIC Overvoltage Protection VoIP SLICs - P0641DF-1E Family
The P0641DF Family of Fixed Negative SIDACtor Solutions:
P0641DF-1E
VBO
SLIC
MS012 (SO-8) Package
ITU K.20 / K.21 & GR-1089 Intra-Building Surge Rating
SIDACtor
Single
Optional Enhanced Diode Performance
Pin-to-Pin compatible with industry standard SO-8 tracking devices.
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Positive / Negative Ringing SLICsFor Long Telephone Lines
Ringing long telephone lines requires extra voltage.
Sometimes a positive / negative ringing SLIC is used:
-48V
+VPositive
DC Supply
-
TelephoneLine
Battrax Protection
Self-Ringing
SLIC-V
Positive Surge Pulse
Negative Surge Pulse
Gate Current+Negative
DC Supply
-V
Gate Current
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SLIC Overvoltage Protection Positive / Negative Tracking Solutions
The B3000 Family of Pos / Neg Tracking Battrax® Solutions
B3104UC
SCR Count
MS-013
A: ITU SurgeC: GR-1089 Surge
Battrax®
e.g. B3164UCIH 10
·l·Pos / Neg Tracking
Discrete Pos / Neg Tracking Battrax® Solutions
B2050CC
SingleA: ITU SurgeC: GR-1089 Surge
Battrax®
IH 10
·l·
Pos Tracking
B1100CC
SingleA: ITU SurgeC: GR-1089 Surge
Battrax®
IH 10·l·Neg TrackingCompak Compak
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Thank You!
Introduction toSLIC Overvoltage Protection