SGS Thomson Microelectronics CLP30-200B1 Datasheet
®
CLP30-200B1
Application Specific Discretes
A.S.D™
OVERVOLTAGE & OVERCURRENT
PROTECTION FOR TELECOM LINE
MAIN APPLICATIONS
Any telecom equipment submitted to transient
overvoltages and lightning strikes such as :
Analog and ISDN line cards
■
PABX
■
DESCRIPTION
The CLP30-200B1 is designed to protect
telecommunication equipment. It provides both a
transient overvoltage protection and an
overcurrent protection.
The externalcomponents(balanced resistors, ring
relays contact, ...) needed by the CLP30-200B1
protection concept require very low power rating.
This results in a very cost effective protection
solution.
FEATURES
■
Dual bidirectional protection device.
■ High peak pulse current :
= 40A (5/310 µs SURGE)
I
PP
= 30A (10/1000 µs SURGE)
I
PP
■
Max. voltage at switching-on : 290V
■
Min. current at switching-off : 150mA
SO8
SCHEMATIC DIAGRAM (Top view)
TIPL
GND
1
TIPS
GND
BENEFITS
■
Voltage and current controlled suppression.
■
Surface Mounting with SO8 package.
■
Very low power rating of external components
on line card : balanced resistors, ring relay, low
voltage SLIC protection.
July 1999 - Ed: 4
GND
RINGL
GND
RINGS
1/11
CLP30-200B1
Standard
Bellcore TR-NWT-1089
First level
Bellcore TR-NWT-1089
Second level
ITU-T-K20 / K21
ITU-T-K20
(IEC61000-4-2)
VDE0433
VDE0878
IEC61000-4-5
FCC Part 68, lightning
surge type A
Peak surge
voltage
(V)
2500
1000
Voltage
waveform
2/10µs
10/100µs
Required peak
current (A)
500
100
Current
waveform
2/10 µs
10/1000 µs
serial resistor to
5000 2/10 µs 500 2/10 µs 40
4000
1000
6000
8000
4000
2000
4000
2000
4000
2000
4000
1500
800
10/700 µs 100
5/310 µs 50
25
1/60 ns ESD contact discharge
ESD air discharge
10/700 µs 100
5/310 µs 50
50
1.2/50 µs 100
1/20 µs 22
50
10/700 µs
1.2/50 µs
1.2/50 µs
10/160 µs
10/560 µs
100
50
100
200
100
5/310 µs
8/20 µs
8/20 µs
10/160 µs
10/560 µs
Minimum
meet
standard (
20
25
0
0
0
5
0
50
0
22
17.5
12
)
FCC Part 68, lightning
surge type B
BLOCK DIAGRAM
1000 9/720 µs 25 5/320 µs 0
TIPL TIPS
Overcurrent
detector
OR
SW1
SW2
OR
Overcurrent
detector
RINGL RINGS
Overvoltage
detector
Overvoltage
detector
Overvoltage
reference
(> 200 V)
Overvoltage
reference
(> 200 V)
GND
2/11
Pin Symbol Description
1 TIPL TIP (Line side)
2/3/6/7 GND Ground
4 RINGL RING(Line side)
5 RINGS RING(SLIC side)
8 TIPS TIP (SLIC side)
APPLICATION NOTE
CLP30-200B1
1.INTRODUCTION
The aim of this section is to show the behavior of
our new telecom line protection device.
Fig.1 : Suscriber line protection topology
telecommunication
"PRIMARY PROTECTION"
line
MDF LINE CARD
"SECONDARYPROTECTION"
CLP30200B1
EXCHANGE
VOLTAGE
REFERENCE
SLIC
Figure 1 is a simplified block diagram of a
subscriber line protection that is mainly used so
far.
This shows two different things :
■
A “primary protection” located on the Main Distribution Frame (MDF) eliminates coarsely the
high energy environmental disturbances (lightning transients and AC power mains disturbances) for which theITU-T-K20 requires a 4kV
10/700 µs test. This can be assumed either by
gas-tubes or silicon protection such as the
TLPxxM.
■
A “secondary protection” located on the line
card eliminates finely the remaining transients
that have not been totally suppressed by the
first stage. The ITU-T-K20 requires a 1 kV
10/700 µs test. At this stage, the protection is
managed by the CLP30-200B1.
2.STMicroelectronics CLP30-200B1CONCEPT
2.1 Evolution of the SLIC protection
Over the years, the performances of the SLICs
considerably increased and therefore the need of
the protection has also evolved.
The CLP30-200B1 is especially designed for the
protection of this new generation of SLIC. For this,
it is based on both overvoltage and overcurrent
protection modes.
Fig.2 : Line card protection
I
Programmable thanksto
an external resistor
+I
Programmable thanksto
any external voltage reference
-V
SWON
SWON
+V
-I
SWON
V
SWON
Line Card operating conditions
The figure 2 summarises the performance of the
CLP30-200B1 which basically holds the SLIC
inside its correct voltage and current values.
3/11
CLP30-200B1
APPLICATION CIRCUIT : CLP30-200B1 in line card
Fig.3 : CLP30-200B1 in line card
PTC
TIP
R
GND
PTC
RING
R
R sense
R sense
TIPL TIPS
Overcurrent
detector
Overvoltage
detector
Overvoltage
detector
SW1
SW2
RINGL
OR
OR
Overcurrent
R sense
detector
RINGS
Overvoltage
reference
(> 200 V)
Overvoltage
reference
(> 200 V)
Figure above shows the topology of a protected
analog subscriber line at the line card side.
■ A first stage based on CLP30-200B1 manages
the high power issued from the external surges.
When used in ringing mode, the CLP30-200B1
operates in voltage mode and provides a
symmetrical and bidirectional overvoltage
protection above 200 V on both TIP and RING
lines. When used in speech mode, the
CLP30-200B1 operates in current mode and
the activation current of the CLP30-200B1 is
adjusted by R
■
A second stage which is the external voltage
SENSE
.
reference device defines the firing threshold
voltage during the speech mode and also
assumes a residual power overvoltage
suppression. This stage can be either a fixed or
programmable device such as LCP1511D.
I
External
voltage
reference
-Vbat
TIP
-Vbat
SLIC
RING
1
2
1
2
Ring
Generator
Rp
Rp
4/11
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