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AN2689 датащи(PDF) 29 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
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AN2689 датащи(HTML) 29 Page - STMicroelectronics

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AN2689
Supply rail protection
Doc ID 14310 Rev 3
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Figure 39.
Package and internal schematic of the RBO40-40
Its specifications are the following:
4.5
Calculations for example 2
The voltage and current across the Transil are:
As with the previous example, the internal elements of the surge generator are not known.
So, the easiest way to proceed is to refer to the voltage and current curves of the generator.
With voltage and current curves produced from a SCHAFFNER NSG5500, LD5505 module,
(see Figure 40 and Figure 41), we can measure the duration tp which corresponds to the
duration between Ip and Ip/2
Table 7.
RBO40-40G electrical characteristics, Transil T2 (-40 °C < Tamb < +85 °C)
Symbol
Test conditions
Min.
Typ.
Max.
Unit
VBR 32
IR = 1 mA
22
35
V
VBR 32
IR = 1 mA, Tamb = 25°C
24
28
32
V
IRM 32
VRM = 20 V
100
µA
IRM 32
VRM = 20 V, Tamb = 25°C
10
µA
VCL 32
IPP = 20 A
(1)
1.
One pulse
tp = 10/1000µs
40
V
T
Temperature coefficient of VBR
910-4/°C
C32
F = 1MHz VR = 0 V
8000
pF
1
2
3
D2PAK
RBO40-40G
Ipp
Rd
Vbr
Vcl
*
+
=
max
Rd
Rs
Vbr
Vs
Ipp
+
-
=



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