LCP02-150B1 STMicroelectronics, LCP02-150B1 Datasheet - Page 6

• Manufacturer Part Number: LCP02-150B1
• Description: SURGE SUPPRES IC FOR SLICS 8SOIC
• Manufacturer: STMicroelectronics

Specifications of LCP02-150B1

• Technology: Mixed Technology
• Number Of Circuits: 1
• Applications: SLIC
• Package / Case: 8-SOIC (5.3mm Width), 8-SOP, 8-SOEIAJ
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power (watts): -
• Voltage - Working: -
• Voltage - Clamping: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 497-2558-5

Technical information
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Technical information
Figure 7.
Figure 7
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 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
fires. 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 dependant as per
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 20mA at 25°C, is temperature dependant
and the same
The capacitors Cn and Cp are used to speed up the crowbar structure firing during the fast
rise or fall 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 gate pins
(Gn and Gp) and to the reference ground track (or plan). The optimized value for Cn and Cp
is 220nF.
shows the classical protection circuit using the LCP02 crowbar concept. This
GND
LCP02 concept behavior
L 1
L 2
Figure 4
also applies.
-Vbat
Rs2
Doc ID 7275 Rev 6
Rs1
Cn
Ign
Gn
T1
RING
Th1
TIP
GND
Th2
T2
Figure 4
Gp
V Ring
Igp
V Tip
+Vb
Cp
LCP02-150B1