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AN2689 Datasheet(PDF) 18 Page - STMicroelectronics

Part # AN2689
Description  Protection of automotive electronics from electrical hazards
PDF  42 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2689 Datasheet(HTML) 18 Page - STMicroelectronics

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Data line protection
AN2689
18/42
Doc ID 14310 Rev 3
Figure 21.
ESD ISO 10605 equivalent circuit
Considering the generator circuit sown in Figure 21, which respects the ESD surge
standard, the following equations apply:
And
Hence the equation
Vc(t) can also be expressed as:
where
 is a coefficient and Y
0 a constant. Thus:
For the initial conditions the limit of VC when t tends to 0 is given by:
This reduces to
Then
and thus
To determine the current, it is necessary to evaluate the voltage equation which is:
High voltage
supply
R (M
Ω)
2 k
Ω
330 pf
Vc
Ic
Rd
Rs
Vbr
t
Vc
t
Ic
+
-
=
)
(
)
(
dt
t
CdVc
t
Ic
)
(
)
(
-
=
Rd
Rs
Vbr
Rd
Rs
t
Vc
dt
t
-CdVc
+
-
+
=
)
(
)
(
()
0
exp
)
(Y
t
Vc
Rd
Rs
C
t
+
=
+
-
λ
dt
t
dVc
=
)
(
()
()+
+
-
+
-
0
exp
1
Rd
Rs
C
t
Rd
Rs
C
λ
()
()
⎥
⎥
⎦
⎤
⎢
⎢
⎣
⎡
+
+
-
-
=
+
-
+
-
0
exp
1
0
Rd
Rs
C
t
Rd
Rs
C
C
Rd
Rs
Vbr
Vc
λ
Rd
Rs
Rd
Rs
Vbr
Vc
+
=
+
-
λ
0
()
Vbr
Vc -
=
0
λ
()
Vbr
Y
Vbr
Vc
Vc
Y=
⇒
-
-
=
0
0
0
0
()
()
Vbr
Vbr
Vc
t
Vc
Rd
Rs
C
t
+
-
=
+
-
0
exp
)
(



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