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AN2689 bảng dữ liệu(PDF) 38 Page - STMicroelectronics

tên linh kiện AN2689
Giải thích chi tiết về linh kiện  Protection of automotive electronics from electrical hazards
PDF  42 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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AN2689 bảng dữ liệu(HTML) 38 Page - STMicroelectronics

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PCB layout recommendations
AN2689
38/42
Doc ID 14310 Rev 3
Inductive coupling is also present on the PCB. This is sometime also called “inductive cross-
talk”. When over voltage occurs, a current crosses the track and makes this track radiate.
This coupling depends on the current variation rate (di/dt). The parasitic inductance coupling
is shown in Figure 58.
Figure 58.
Inductive coupling representation
Like capacitive coupling, the longer the tracks to the protection device the larger will be the
electromagnetic field.
The solution to minimize the capacitive and inductive coupling consists of placing the
protection device as close as possible to the accessories connector, where the surge impact
is the most probable. (Figure 59)
Figure 59.
Where to place the protection device
Vsurge
Isu
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Module to protect
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