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LCP1531RL
Protection for single voltage SLICs
August 2013 DocID13397 Rev 5 1/10
LCP1531Programmable transient voltage suppressor for SLIC protection
Datasheet - production data
Figure 1. LCP1531 functional diagram
Features Dual programmable transient suppressor Wide negative firing voltage range:
VGn = -175 V max. Low dynamic switching voltages:
VFP and VDGL Low gate triggering current: IGT = 5 mA max Peak pulse current: IPP = 37.5 A (5/310 µs) Holding current: IH = 150 mA min. Low space consuming package
Benefits A Trisil™ is not subject to ageing and provides
a fail-safe mode in short circuit for better
protection. Trisils are used to help equipment to meet
various standards such as YDT695, GR-1089
and ITU-T K20/21. Trisils are UL94 V0 resin approved and are
UL497B approved [file: E136224]).
DescriptionThese devices are ideally suited to meet the
protection requirement of VoIP SLICs located in
next generation residential gateways. They can
be used for protecting any ringing SLIC since they
meet the protection standard requirements.
Positive overvoltages are clamped by 2 diodes.
Negative surges are suppressed by 2 thyristors,
their breakdown voltage being referenced to -VBAT
through the gate.
These components present a very low gate
triggering current (IGT) to reduce the current
consumption on printed circuit board during the
firing phase.
TM: Trisil is a trademark of STMicroelectronics
Characteristics LCP15312/10 DocID13397 Rev 5
1 Characteristics
Table 1. Standards compliance
Table 2. Thermal resistance
DocID13397 Rev 5 3/10
LCP1531 Characteristics
Figure 2. Electrical characteristics (definitions)
Figure 3. Pulse waveform
Table 3. Absolute ratings (Tamb = 25 °C, unless otherwise specified)
Characteristics LCP15314/10 DocID13397 Rev 5
Table 4. Parameters related to the diode LINE / GND (Tamb = 25 °C)
Symbol Test conditions Max. Unit IF = 5 A t = 500 µs 3 V
VFP 10/700 µs VPP = 1.5 kV RS = 15 Ω 5V
Table 5. Parameters related to the protection thyristors (Tamb = 25 °C)
Symbol Test conditions Min. Max. UnitIGT VLINE = -48 V 0.1 5 mA VGn = -48 V 150 mA
IRG VRG = -75 V 5 µA DGL
VGn = -48 V(1) The oscillations with a time duration lower than 50 ns are not taken into account.
10/700 µs VPP = 1.5 kV RS = 15 Ω IPP = 27.5 A 7 V
Table 6. Parameters related to diode and protection thyristors (T amb = 25 °C,)
Symbol Test conditions Typ. Max. Unit VGn / LINE = -1 V VRM = -75 V Tj = 25 °C 5 µA VLINE = -50 V, VRMS = 1 V, F = 1 MHz
VLINE = -2 V, VRMS = 1 V, F = 1 MHz pF
Table 7. Recommended gate capacitance
DocID13397 Rev 5 5/10
LCP1531 Technical information
2 Technical information
Figure 4. LCP1531 concept behaviorFigure 4. shows the classical protection circuit using the LCP1531 crowbar concept. This
topology has been developed to protect the new high voltage SLICs. It allows to program
the negative firing threshold while the positive clamping value is fixed at GND.
When a negative surge occurs on one wire (L1 for example) a current IG flows through the
base of the transistor T1 and then injects a current in the gate of the thyristor Th1. Th1 fires
and all the surge current flows through the ground. After the surge when the current flowing
through Th1 becomes less negative than the holding current IH , then Th1 switches off.
When a positive surge occurs on one wire (L1 for example) the diode D1 conducts and the
surge current flows through the ground.
Figure 5. Example of PCB layout based on LCP1531 protectionFigure 5. shows the classical PCB layout used to optimize line protection.
The capacitor C is used to speed up the crowbar structure firing during the fast surge edges.
This allows minimization of the dynamic breakover voltage at the SLIC Tip and Ring inputs
during fast strikes. Note that this capacitor is generally present around the SLIC - Vbat pin.
So to be efficient it has to be as close as possible from the LCP1531 Gate pin and from the
reference ground track (or plan) (see Figure 5.). The optimized value for C is 100 nF.
Technical information LCP1531 DocID13397 Rev 5
The series resistors Rs1 and Rs2 designed in Figure 4. represent the fuse resistors or the
PTC which are mandatory to withstand the power contact or the power induction tests
imposed by the various country standards. Taking into account this fact the actual lightning
surge current flowing through the LCP1531 is equal to: surge = V surge / (Rg + Rs)
With:
V surge = peak surge voltage imposed by the standard.g = series resistor of the surge generator
Rs = series resistor of the line card (e.g. PTC)
The LCP1531 is particularly optimized for the new telecom applications such as the fiber in
the loop, the WLL, the remote central office. In this case, the operating voltages are smaller
than in the classical system. This makes the high voltage SLICs particularly suitable.
The schematics of Figure 6. gives the most frequent topology used for these applications.
Figure 6. Protection of high voltage SLIC
Figure 7. Surge peak current versus
overload duration
Figure 8. Relative variation of holding current
versus junction temperature
