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PDF LCP12 Data sheet ( Hoja de datos )

Número de pieza LCP12
Descripción Protection IC for ringing SLICs
Fabricantes ST Microelectronics 
Logotipo ST Microelectronics Logotipo



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LCP12
Protection IC for ringing SLICs
SO-8 wide
LCP12
Features
Protection IC recommended for ringing SLICs
Wide firing voltage range: -120 V to +120 V
Low gate triggering current: IG = 5 mA max
Peak pulse current: IPP = 50 A (10/1000 µs)
Holding current: IH = 150 mA min.
Applications
Dual battery supply voltage SLICs
Central office (CO)
Private branch exchange (PBX)
Digital loop carrier (DLC)
Digital subscriber line access multiplexer
(DSLAM)
Fiber in the loop (FITL)
Wireless local loop (WLL)
Hybrid fiber coax (HFC)
ISDN terminal adapter
Cable modem
TM: Trisil is a trademark of STMicroelectronics
Datasheet production data
Description
The LCP12 has been developed to protect SLICs
operating on both negative and positive battery
supplies, as well as high voltage SLICs. It
provides crowbar mode protection for both TIP
and RING lines. The surge suppression is
assumed for each wire by two thyristor structures,
one dedicated to positive surges the second one
for negative surges. Both positive and negative
threshold levels are programmable by two gates.
LCP12 can be used to help equipment to meet
various standards such as UL1950, IEC 60950 /
CSAC22.2, UL1459 and TIA-968-A. LCP12
pinout and clearance is compatible with UL60950.
Resin meets UL94 V0.
LCP12 is UL497B approved - file: E136224.
The LCP12 associated with Epcos PTC model
B59173C1130A151 is compliant with
ITU TK20/K21 (4 kV lightning and AC power fault
tests).
Figure 1. Functional diagram
TIP
Gn Gp
GND
RING
Figure 2. Pin-out configuration
TIP
Gn
Gp
RING
NC
GND
GND
NC
March 2014
This is information on a product in full production.
DocID17500 Rev 4
1/10
www.st.com

1 page




LCP12 pdf
LCP12
2 Technical information
Technical information
L1
GND
L2
Figure 7. LCP12 concept behavior
Rs1
IGn
-Vbat Gn
TIP
T1 Th1
Th2
Cn
Rs2
RING
GND
V Tip
T2
IGp
Gp +Vb
Cp
V Ring
Figure 7 shows the classical protection circuit using the LCP12 crowbar concept. This
topology has been developed to protect two-battery voltage SLICs. It allows both positive
and negative firing thresholds to be programmed. The LCP12 has two gates (Gn and Gp).
Gn is biased to negative battery voltage -Vbat, while Gp is biased to the positive battery
voltage +Vb.
When a negative surge occurs on one wire (L1 for example), a current IGn flows through the
base of the transistor T1 and then injects a current in the gate of the thyristor Th1 which
turns-on. All the surge current flows through the ground. After the surge, when the current
flowing through Th1 becomes less negative than the negative holding current IH-, Th1
switches off. This holding current IH- is temperature dependent as per Figure 4
When a positive surge occurs on one wire (L1 for example), a current IGp flows through the
base of the transistor T2 and then injects a current in the gate of the thyristor Th2 which
fires. All the surge current flows through the ground. After the surge, when the current
flowing through Th2 becomes less positive than the positive holding current IH+, Th2
switches off. This holding current IH+, typically 20 mA at 25 °C, is temperature dependent
and the same Figure 4 also applies.
The capacitors Cn and Cp are used to speed up the crowbar structure firing during the fast
rise or fall edges. This allows minimization of the dynamic breakover voltage at the SLIC TIP
and RING inputs during fast surges. Please note that these capacitors are generally
available around the SLIC. To be efficient they have to be as close as possible to the LCP12
gate pins (Gn and Gp) and to the reference ground track (or plan). The optimized value for
Cn and Cp is 220 nF.
The series resistors Rs shown in Figure 7 represent the fuse resistors or the PTCs which
are needed to withstand the power contact or the power induction tests imposed by the
country standards. Taking this factor into account, the actual lightning surge current flowing
through the LCP12 is equal to:
I surge = Vsurge / (Rg + Rs)
With
V surge = peak surge voltage imposed by the standard.
Rg = series resistor of the surge generator
Rs = series resistor of the line card (e.g. PTC)
DocID17500 Rev 4
5/10
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