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October 2010 Doc ID 8627 Rev 4 1/12
12
LCDP1521
Dual-line programmable transient voltage suppressor for
SLIC protection
Features
■ dual-line programmable transient voltage
suppressor
■ wide negative firing voltage range
■ V
MGL
= -150 V max.
■ low dynamic switching voltages:
V
FP
and V
DGL
■
low gate triggering current: I
GT
= 5 mA max.
■ peak pulse current: I
PP
= 20 A (10/1000 µs)
■ holding current: I
H
= 150 mA min.
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 meet various
standards such as UL1950, IEC 950 / CSA
C22.2, UL1459 and FCC part68.
■ Trisils have UL94 V0 approved resin.
■ Trisils are UL497B approved (file: E136224).
Description
This device has been 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
-V
BAT
through the gate.
This component presents a very low gate
triggering current (I
GT
) to reduce the current
consumption on printed circuit boards during the
firing phase.
TM: Trisil is a trademark of STMicroelectronics
Figure 1. Functional diagram
SO-8
TIP 1 RING 1
TIP 2
RING 2
GATE
GATE
GND
GND
1
2
3
4
8
7
6
5
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