LCDP1521SRL ,Dual line programmable transient voltage suppressor for SLIC protectionFeatures■ Dual line programmable transient voltage suppressor with separated gates■ Wide negative f ..
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LCDP1521SRL
Dual line programmable transient voltage suppressor for SLIC protection
February 2012 Doc ID 16268 Rev 2 1/10
LCDP1521SDual line programmable transient voltage suppressor for
SLIC protection
Features Dual line programmable transient voltage
suppressor with separated gates 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 = 40 A (5/310 µs) Holding current: IH = 150 mA min.
Benefits A Trisil™ is not subject to ageing and provides
a fail safe mode in short circuit for a better
protection. Trisils are used to help equipment to meet
various standards such as UL1950, IEC 60950
/ CSA C22.2, UL1459 and TIA-968-A (formerly
FCC part 68). Trisils have UL94 V0 resin approved (Trisils
are UL497B approved - file: E136224).
DescriptionThis device has been especially designed to
protect 2 new high voltage, as well as classical
SLICs, against transient overvoltages.
Positive overvoltages are clamped by 2 diodes.
Negative surges are suppressed by 2 thyristors,
their breakdown voltage being referenced to
-VBAT through the gate. Separated gates allow the
SLICs to be supplied by two different voltages.
TM: Trisil ,is a trademark of STMicroelectronics
Figure 1. Functional diagram
Characteristics LCDP1521S2/10 Doc ID 16268 Rev 2
1 Characteristics
Table 1. Compliant with the following standards
Table 2. Thermal resistance
LCDP1521S CharacteristicsDoc ID 16268 Rev 2 3/10
.
Figure 2. Electrical characteristics - definitions (Tamb = 25 °C)
Figure 3. Repetitive peak pulse current
Table 3. Absolute ratings (0 °C < Tj < 70 °C, unless otherwise specified)
Characteristics LCDP1521S4/10 Doc ID 16268 Rev 2
Table 4. Parameters (Tj = 25°C unless otherwise specified)
Table 5. Recommended gate capacitance
LCDP1521S Technical informationDoc ID 16268 Rev 2 5/10
2 Technical informationThe LCDP1521S 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 4 shows the topologies most frequently used for these
applications.
Figure 4. Protection of high voltage SLICs
Figure 5. Non repetitive surge peak on-state current versus pulse duration
Technical information LCDP1521S6/10 Doc ID 16268 Rev 2
Figure 6. Relative variation of holding current versus junction temperature
