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AN2689 Datasheet(PDF) 36 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) 36 Page - STMicroelectronics

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PCB layout recommendations
AN2689
36/42
Doc ID 14310 Rev 3
Then
Therefore, for L1, the over voltage is
and for L2 the over voltage is
That means the total over voltage seen by the module would be something close to Vcl +
100 V! This shows that whatever the protection device, if the routing is not optimized there
will be a big impact of the track inductance to the protection device on the remaining voltage
in case of fast transient discharge. Figure 53. illustrates the recommended Transil wiring to
prevent this phenomenon.
Figure 53.
Recommended Transil wiring
The equivalent schematic diagram for the recommended wiring layout is shown in Figure 54.
Figure 54.
Details of the remaining voltage at the module to protect
In this layout the remaining voltage at the module to protect is:,
So, in the worst case (when L3 = L4 = 0), V is equal to VCL.
1
9
9
10
5
.
12
10
5
.
12
-
-
*
*
⇒
=s
A
dt
di
V
dt
di
L5
.
62
1
≈
V
dt
di
L5
.
37
2
≈
Module to protect
Vnom
Vmax
Transil in
SMA package
L1di/dt
+25kV ESD ISO10605
L2di/dt
Vcl
Module to protect
Vnom
Vmax
L3di’/dt
L4di’/dt
L1=L3 & L2=L4
I
I’
dt
dI
L
dt
dI
L
Vcl
V
'
4
'
3-
-
=



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