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AN574 Datasheet(PDF) 2 Page - STMicroelectronics

No. de Pieza. AN574
Descripción  TRANSIL TRISIL COMPARISON
Descarga  4 Pages
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Fabricante  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
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AN574 Datasheet(HTML) 2 Page - STMicroelectronics

   
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2.3. Electrical Schematics.
Figure 2 : Electrical Schematics
The Transil may be unidirectional (Fig. 2 (A)) or
bidirectional (Fig. 2 (B)). In unidirectional form, it
operates as a clamping device in one sense and
like a rectifier in the other.
The Trisil may be designed to function with a
fixed breakover value (fig. 2 (c)) or a value which
can be programmed by the gate (fig.2(D)).
Figure 3 : Electrical behaviour in a Transil and a Trisil
For the same surge (A), figure 3 shows the
electrical behaviour of a Transil and a Trisil.
The parts (B) and (C) of figure 3 give the voltage
across the Transil and the current through it. It is
important to note that the current flows through
the protection device only during the clamping
phase. This
fact has to be taken into account
when the protector is chosen, because the
current duration is always shorter than that of
the overvoltage surge.
The parts (D) and (E) of figure 3 relate to the
Trisil behaviour. In this case the device fires
when
the
voltage
across
it
reaches
the
breakdown voltage VBO and remains in the
on-state until the current falls under the holding
value IH. The current flows through the Trisil
during all of the on-state phase.
2.3. Electrical Behaviour.
(A)
(B)
TRANSIL
GATE
(C)
(D)
TRISIL
(A)
(B)
(C)
(D)
(E)
t
t
t
t
t
V
CL
V
BO
I
P1
I
P2
I
H
Surge
Voltage across the
TRANSIL
Current through the
TRANSIL
Voltage across the
TRISIL
Current through the
TRISIL
®
APPLICATION NOTE
2/4


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