LCP02-150M STMicroelectronics, LCP02-150M Datasheet - Page 6

• Manufacturer Part Number: LCP02-150M
• Description: IC PROTECTION SLIC POWERSO-10
• Manufacturer: STMicroelectronics

Specifications of LCP02-150M

• Technology: Mixed Technology
• Number Of Circuits: 1
• Applications: SLIC
• Package / Case: PowerSO-10 Exposed Bottom Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power (watts): -
• Voltage - Working: -
• Voltage - Clamping: -

Technical information
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Technical information
Figure 5.
Figure 5.
This topology has been developped to protect the new two-battery voltage SLICs. It allows
both positive and negative firing thresholds to be programmed. The LCP02-150M has two
gates (G
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
fires. The entire surge current flows through the ground. After the surge, when the current
flowing through Th1 becomes less negative than the negative holding current, Th1 switches
off. This holding current I
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. The entire surge current flows through the ground. After the surge, when the current
flowing through Th2 becomes less positive than the positive holding current I
switches off. This holding current I
25° C.
The capacitors C
surge rise or falling edges. This allows to minimize the dynamical 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 LCP02-
150M gate pins (G
value for C
The series resistors Rs1 and Rs2 represent the fuse, 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 LCP02-150M is equal to:
Where:
The LCP02-150M topology is particularly optimized for the new telecom applications such
as cable modem, fiber in the loop, WLL systems, and decentralized central office for
example. The schematics of
used for these emergent applications.
I surge = Vsurge / (Rg + Rs)
Vsurge = peak surge voltage imposed by the standard.
Rg = series resistor of the surge generator
Rs = series resistor of the line card (e.g. PTC)
N
shows the classical protection circuit using the LCP02-150M crowbar concept.
and G
N
GND
and C
LCP02 concept behavior
L 1
L 2
P
N
). Gn is biased to negative battery voltage -Vbat, while G
N
P
and C
and G
is 220 nF.
H-
P
P
are used to speed up the crowbar structure firing during the fast
is temperature dependant as per
) and to the reference ground track (or plan). The optimized
Figure 6.
-Vbat
Rs2
Rs1
Cn
H+
Ign
is temperature dependant and is equal to 30 mA at
Gn
and
Figure 7.
T1
RING
give the 2 most frequent topologies
Th1
TIP
GND
Figure 2.
Th2
T2
Gp
V Ring
P
Igp
V Tip
+Vb
is biased to the
Cp
H+
LCP02-150M
, Th2