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CLP200M-TR
OVERVOLTAGE AND OVERCURRENT PROTECTION FOR TELECOM LINE
CLP200MOVERVOLTAGE AND OVERCURRENT
PROTECTION FOR TELECOM LINE
Application Specific Discretes
A.S.D.
SCHEMATIC DIAGRAMAny telecom equipment submittedto transient
overvoltages and lightning strikes suchas: Analog and ISDNline cards PABX Main Distribution Frames Primary protection modules
MAIN APPLICATIONSThe CLP200Mis designedto protect telecommu-
nication equipment.It provides botha transient
overvoltage protection andan overcurrent protec-
tion.is housedina PowerSO-10TM package.
DESCRIPTION Dual bidirectional protection device. High peak pulse current:
ipp= 100a (10/1000μs surge) Max. voltageat switching-on: 290v Min. currentat switching-off: 150ma Failure status outputpin
FEATURES Both primary and secondary protection levelsin
one device. Voltage and current controlled suppression. Surface Mounting with PowerSO-10TM
package. Line card cost reduction thankstothe verylow
power ratingof external components required:
balanced resistors, ring relay,low voltage SLIC
protection
BENEFITS
CLP200M
BLOCK DIAGRAM
CLP200M
Fig.1: Subscriberline protection topology
Fig.2: Line card protection
APPLICATION NOTE INTRODUCTIONThe aimofthis sectionisto showthe behaviorof
our new telecom line protection device. Thisde-
vice includesa primary protection level andis suit-
able for main distribution frames and line
cardsThis protection conceptis explained and,in
addition, the CLP200M performances are ana-
lysed when facing different surgesas describedin
the CCITT recommendations.
Figure1isa simplified block diagramofa sub-
scriberline protection thatis mainly usedsofar.
This shows two different things:A “primary protection” locatedonthe Main Distri-
bution Frame (MDF) eliminates coarsely the
high energy environmental disturbances (light-
ning transients and AC power mains
disturbances)A “secondary protection” locatedonthe line card
includesa primary protection level (first stage) and residual protection (second stage) which elimi-
nates finelythe remaining transientsthat havenot
been totally suppressedbythefirst stage.
The CLP200M canbe used bothin MDFs andin
line cards.In that case, any line card maybe
swapped from one MDFto another one withoutre-
ducingthe efficiencyofthe whole system protec-
tion.
The CCITT requirements are differentfor these
two protection locations (MDFs and line cards).
Concerningthe “primary protection”,the CCITTre-
quiresa 4kV, 10/700μs surge test whereasthe
“secondary protection” hasto withstanda 1kV,
10/700μs surge test.
The explanations which follow are basically
coveringthe line card application.
STMicroelectronics CLP200M CONCEPT
2.1 Evolutionofthe SLIC protectionOver the years, the silicon protection perfor-
mances have considerably changed.
The first generationof products like SMTHBTxx
and SMTHDTxx offered fixed overvoltage protec-
tion against surgeson either TIPor RING linein
four packages.
The following generation like THBTxx and
THDTxxstill offered fixed overvoltage protection
against surgeson bothTIP and RING linesintwo
packages.
The next step was the introductionof the
LCP1511D which brought the advantageoffull
programmable voltage.
Today,the CLP200M combinesthe featuresofall
the previous generations.In additionto that,itof-
fersan overcurrent detection when operatingin
speech mode and alsoa Failure Status outputsig-
nal.
The figure2 summarizesthe performanceofthe
CLP200M which basically holdsthe SLIC insideits
correct voltage and current values.
CLP200M
APPLICATION CIRCUIT: CLP200Min line card
Fig.3: CLP200Minline card
Figure3 above showsthe topologyofa protected
analog subscriber lineatthe exchange side. The
CLP200Mis connectedtothe ring relayvia two
balancedRp resistors, andtothe Subscriber Line
Interface Circuit.A second deviceis located near
the SLIC:it canbe eithera LCP1511Dora THDT
series.
These two devicesare complementary and their
functionsare explained below: The first stage basedon CLP200M manages
the high power issued from the external
surges. When usedin ringing mode, the
CLP200M operatesin voltage mode and pro-
videsa symmetrical and bidirectional
overvoltage protectionat +/-215Von both TIP
and RING lines. When usedin speech mode,
the CLP200M operatesin current mode and
the activation currentof the CLP200Mis ad-
justedby RSENSE. The second stageisthe external voltage refer-
ence device which definesthe firing threshold
voltage duringthe speech mode and also as-
sumes a residual power overvoltage
suppression. This protection stagecanbe either fixedor programmable breakover device. The
THDTxx family actsasa fixed breakover device
whilethe LCP1511D operatesasa programma-
ble protection.
Thanksto this topology, the surge currentinthe
lineis reduced afterthe CLP200M. Becausethe
remaining surge energyis low,the power ratingsof
Rp,the ring relay contactsandthe external voltage
reference circuit maybe downsized. This resultsin significant cost reduction.
CLP200M
2.3 Ringing mode
Fig.4: Switchingby voltage during ringing mode.
Fig.5a: Methodto adjustthe reference voltage. ringing mode (Ring relayin position2),the only
protection device involvedisthe CLP200M. normal conditions,the CLP200M operatesinre-
gion1of
A1 curve, andis idle.an overvoltage occuring betweenTIP(or RING)
and GND reaches the internal overvoltage
refe-rence (+/- 215V),the CLP200M acts andthe
lineis short-circuitedto GND.Atthis timethe oper-
ating point movesto region2for positive surges
(region3for negative surges). Oncethe surge cur-
rent disappears, the device returnstoits initial
state (region1).
For surges occuring between TIP and RING,the
CLP200M actsinthe same way. This means that
the CLP200M ensuresa tripolar protection.
When used alone,the CLP200M actsatthe inter-
nal overvoltage reference level (+/- 215V). Fur-
thermore,it ispossibleto adjustthis threshold levela lower voltageby using:.upto4 fixed external voltage reference (VZ1to
VZ4) (see fig.5a).
CLP200M external reference supplies,Vb1 andVb2 (see fig.5b)..
Fig.5b: Methodto adjustthe reference voltage.
2.4 Speech mode
Fig.6: Switchingby current during speech mode. speech mode (Ring relayin position1),the pro-
tectionis providedby the combinationof both
CLP200M andthe external voltage referencede-
vice. normal conditions,the working pointofthiscir-
cuitis locatedin region4of
A2 curve: the
CLP200Mis idle.
Whena surge occursonthe line,the external volt-
age reference device clampsat GNDor -Vbatre-
spectivelyfor positive and negative surges.
This generatesa current whichis detectedby
RSENSE and causes theprotectiontoact:thelineis
short-circuitedto GND.
The operating point movesto region5for positive
surgesor region6for negative surges.
Once the surge current falls below the switch-
ing-off current ISWOFF,the CLP200M returnstoits
initial state (region4).
Furthermore, the CLP200M switches whenan
overvoltage, either positiveor negative, occursei-
ther: simultaneouslyon bothTIP and RING lines ver-
sus GND. betweenTIP and RING. onTIP(or RING) versus GND.
CLP200M
Fig.7a and7b: Switching-on current versus
RSENSE.
Fig.9: Operation limits and destruction zoneof
the CLP200M.
Fig.8: Failure Status circuit and diagnostic.
The choiceofthe switching-on currentis functionthe RSENSE resistors. normal operating condition, onlythe negative
currentofthe signalisof interest. This current (typ-
ically below -150 mA) shouldnot activatethe pro-
tection device CLP200M. Thereforethe levelof
activationistobe chosenjust abovethis limit (typi-
cally -200 mA). This levelis adjusted through
RSENSE.
Figures7a and7b enablethe designersto choose
the right RSENSE value.
EXAMPLE:The choiceof RSENSE =4Ω ensuresa negative
triggeringof -220mAmin and -320mA max.Inthis
case,the positive triggeringwillbe 180mAmin and
280mA max.
2.5. Failure StatusThe CLP200M hasan internal feature that allows
the usertogeta Failure Status (FS) indication.
Whenthe CLP200Mis short-circuitingthe lineto
GND,a signalcanbe managed throughpin1. This
signalcanbe usedto turna LEDonin orderto pro-
videa surge indication.It may alsobe used witha
logic circuitryto countthe numberof disturbances
appearingonthe lines.a surge exceedingthe maximum ratingsofthe
CLP200M occurs onthe line, thedevicewillfailina
short-circuit state.
The figure9 showstwo different curves: The lower one indicates the maximum
guaranted working limitsofthe CLP200M. The upper curve showsthe limit above whichthe
CLP200Mis completely destructed.Inthis case,
the Fail Diagnosticpinison.
CLP200M
Fig.10: Transversal and longitudinal test
topologies.
Fig.12: Power contacttest circuit.
Fig.11: Power inductiontest circuit.
3. CLP200M TESTS RESULTS ACCORDINGTO
CCITT K20 RECOMMENDATIONS
3.1 CCITT K20 Recommendations respect withthe CCITT recommendations,the
CLP200M hasto withstand three kindsof distur-
bances.
3.1.1. Lightning simulation
(Test2, table 2/K20)Thistest shallbe donein transversal and longitudi-
nal modesas shownin figure10.
The test generatoris the 10/700μs with 4kVof
peak voltage.
3.1.2. Power induction
(Test3a and3b, table 2/K20)Two kindsof tests usingthe same circuit topology
(see fig.11)are definedinthe CCITT K20.
Vac(max)= 300VRMS,R1=R2=600Ω operating andtest duration= 200 ms. Test3b:
Vac(max)= 300VRMS(*),R1=R2= 200Ω operating andtest durationnot defined.
(*) Recommended value.
3.1.3. Power contact (Test3, table 1/K20)This test shallbe done withthe test circuitof figure
Vac(max)= 220VRMS, with switchSin each posi-
tion and duration15 min.
3.1.4. Acceptance criteria and numberof testsForthe testsdescribed inchapter 3.1.1., 3.1.2.and
3.1.3.two criteriaare defined: Equipment shall withstandthetest without dam-
age and shall operate properly withinthe specified
limits.Afire hazard shouldnot occurinthe equipmenta resultofthe tests.
The criteriaare affectedtothe different testsas
mentionedinthe table1.
CLP200M
Table1: Acceptance criteriaand numberof tests.
Fig.13: Lightning simulation test.
Fig.14: CLP200M responsetoa positive surge.
Fig.15: CLP200M responsetoa negative surge.
Fig.16: Power inductance test.
3.2. Ringing mode
3.2.1. Lightning simulation testLightning phenomenaarethe most common surge
causes. The purposeofthis testisto checkthero-
bustnessofthe CLP200M against these lightning
strikes.
Figures14 and15 show that the remaining
overvoltage does not exceed +/- 260V. The
CLP200M switcheson within 0.7μs and with-
standsthe 100A givenbythe CCITT K20 genera-
tor.
Consequently,the CLP200M totally fulfillsthis test.
3.2.2 Power induction
(Test3a and3b table 2/K20)Surgesof long duration with medium voltage value
are mainly producedbythe proximityofa sub-
scriber line withanAC mains lineor equipment.
The purposeof thistestisto checkthe robustnessthe CLP200M against these capacitive coupling
disturbances.
CLP200M
Fig.17: CLP200M responsetothe induction test
(Test 3a).
Fig.18: CLP200M reponsetothe induction test
(Test 3b).
Fig.19: Power contact test.
Fig.20: Power contact test3 (With 10Ω series).
Fig.21: Lightning testin speech mode.
Figures17 and18 show thatthe remaining voltage
doesnot exceed 270V.
Consequently,the CLP200M totally fulfillsthis test.
The test durationisnot specifiedin test3b.Ifthe
duration exceeds5swedo suggestto followthe
soldering and mounting recommendations given page17ofthis document.
3.2.3 Power contact (Test3 table 1/K20)This long duration surgeis produced when con-
nectinga subscriber linetoanAC mains lineor
equipment. The purposeof thistestisto checkthe
robustnessof the CLP200M against these distur-
bances.
The test3of CCITT K20 requiresa serial PTC(or
fuse) whichis insertedinthe test circuitto limitthe
current rate. This PTC actslikean open-circuitina
non-instantaneous way whena surge occurson
the line. Meanwhile,the CLP200M hasto with-
standthe surge.
Figure20 shows thatthe remaining overvoltage
doesnot exceed 250V and shows thatthe PTC
actslikean open-circuit after60 ms.
Consequently,the CLP200M totally fulfillsthis test.
3.3. Speech mode
3.3.1. Lightning simulation test
(Test2, table 2/K20)
CLP200M
Fig.22: CLP200M responsetoa positive surge.
Fig.23: CLP200M responsetoa negative surge.
Fig.24: Power induction test.
Fig.25: Induction test behavior (Test 3a).
Figures22 and23 givethe voltage and currentbe-
havior during positiveand negative 4kV, 10/700μs,
surge tests usinga LCP1511Das second stage
protection device. The firing threshold valuesare
now adjustedto GND andto -Vbat (-48V)bythe
actionof thesecond stage protection whichactsas external voltage reference. shownon these figures,the maximum remain-
ing voltage does not exceed +2.5Vfor positive
surges and -60Vfor negative surges.
Consequently,the CLP200M totally fulfillsthis test.
3.3.2 Power induction test
(Test3a and3b, table 2/K20)Figures25 and26 show thatthe maximum remain-
ing voltage does not exceed +2Vfor positive
surges and -55Vfor negative surges.
Consequently,the CLP200M totally fulfillsthis test.
The test durationisnot specifiedin test3b.Ifthe
duration exceeds5swedo suggestto followthe
soldering and mounting recommendations given page17ofthis document.
