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AN2689 Datasheet(PDF) 22 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) 22 Page - STMicroelectronics

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Supply rail protection
AN2689
22/42
Doc ID 14310 Rev 3
Figure 26.
ISO 7637-2, pulse 2 waveform characteristics
Figure 27.
ISO 7637-2, pulse 2 test set up
As for the examples in Section 3, it is necessary to check if the residual voltage after the
protection device is safe for the electronic module and if the protection device itself can
handle the power dissipated in the protection device during the suppression.
Let’s consider an SM15T33AY protection device (Figure 28). Its specifications are given in
Table 5 and Table 6.
Figure 28.
SM15T33AY package
V
a
0V
t
d
t
r
V
s
t
1
0.1 Vs
0.9 Vs
1/F
Module to protect
Vnom =13.5 V
Vmax = 45 V
Tmax = 85 °C
Transil
Vcl
Surge
Generator
Vs = 50 V
Rs = 2
Ω
td = 50 µs
Tr = 1 µs
F = 0.2 Hz to 5 Hz
K
A
Unidirectional



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