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AN2689 датащи(PDF) 21 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) 21 Page - STMicroelectronics

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AN2689
Supply rail protection
Doc ID 14310 Rev 3
21/42
4
Supply rail protection
4.1
Protection topology
4.1.1
Clamping topology
For supply rail protection the recommended topology is the “clamping topology”.
Figure 25 shows a schematic of the supply rail protection topology.
Figure 25.
Supply rail protection using a Transil
The choice of the protection device depends on the surge that is applied. To illustrate the
possible device selection, two protection examples are given below.
4.2
Supply rail protection example 1: pulse 2 ISO 7637-2
Pulse 2 from ISO 7637-2 standard corresponds to a surge, which is produced by a sudden
interruption of current in a device connected in parallel with the Transil, due to inductance in
the wiring harness. The pulse is directly applied to the battery and is a positive pulse. See
Figure 26 for the pulse characteristics.
The typical parameters are:
●
Rise time (10-90%) - approximately 10 µs (tr)
●
Pulse width (10-90%) - typically 50 µs (td)
●
Pulse amplitudes from +37 V to +50 V (Vs)
●
Pulse repetition from 0.2 Hz to 5 Hz (F)
●
Output impedance 2
Module to protect
Vnom
Vmax
Transil
Vbat



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