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AN2689 датащи(PDF) 28 Page - STMicroelectronics

номер детали AN2689
подробное описание детали  Protection of automotive electronics from electrical hazards
PDF  42 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2689 датащи(HTML) 28 Page - STMicroelectronics

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Supply rail protection
AN2689
28/42
Doc ID 14310 Rev 3
4.4
Supply rail protection example 2: pulse 5a load dump
ISO 7637-2
The load dump is caused by the discharged battery being disconnected from the alternator
while the alternator is generating charging current
Parameters are:
●
Pulse width -td [40 to 400 ms]
●
Pulse amplitude -Vs [65 to 87 V]
●
Impedance is Rs [0.5  to 4 
●
Vbat = 13.5 V
Figure 37.
ISO 7637-2, pulse 5a waveform characteristics
Figure 38.
Load dump protection test set up
In the same manner as for the last case (ISO pulse 2), we have to determine if the residual
voltage after the protection device is safe for the electronic module and if the power
dissipation involved in the protection device during the suppression is supported by the
protection device itself.
Consider now the RBO40-40 device (see Figure 39) which offers a surge protection
capability and a reverse battery protection.
V
bat
0V
t
d
t
r
V
s
0.1Vs
0.9Vs
t
Module to protect
Vnom =13.5 V
Vmax =45 V
Tmax = 85 °C
Vcl
Surge
Generator
Vs = 87 V
Rs =2
Ω
td = 100 ms
Tr = 10 ms
Vbat = 13.5 V
Transil



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