THDT58S1 Datasheet, PDF (6/7 Pages) STMicroelectronics – TRANSIENT VOLTAGE SUPPRESSOR FOR SLIC PROTECTION

THDT58S / THDT58S1
APPLICATION CIRCUIT
Typical SLIC protection concept
RING
GENERATOR
LINE A
T
E
S
T
R
E
L
A
Y
S
LINE B
PTC
PTC
THBTXXX
FUNCTIONAL DESCRIPTION
RING
RELAY
-V
bat
TIP
SLIC
THDT58S
THDT58S1
RING
Line A
D1
D2
Line B
Tip
P1
P2
Ring
Line A Protection =
- For positive Surges versus GND, the
diode D1 will conduct
- For negative Surges versus GND, the
Protection device P1 will trigger at a
maximum voltage equal to the VBO.
Line B Protection =
- For Surges on line B, the operatingmode
is the same, D2 or P2 is activated.
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