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AN2689 датащи(PDF) 31 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) 31 Page - STMicroelectronics

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AN2689
Supply rail protection
Doc ID 14310 Rev 3
31/42
So, C = 20.35 mF.
Hence:
Then, thanks to the test curves from the load dump generator, the result is tp = 33.6 ms and
Rd = 0.22 .
From the equations in Section 4.5 on page 29, Vcl = 33.8 V and Ipp = 26.6 A, which means
the residual over voltage will be consistent with the admissible maximum voltage of the
module to protect.
4.5.2
Power dissipation determination
The peak power dissipation in the Transil will be:
Figure 42, shows that for 33.6 ms exponential surge duration the maximum admissible
power the RBO40-40 can withstand is approximately 900 W.
Figure 42.
Peak pulse versus exponential surge duration
Figure 43. shows the derating factor for the ambient temperature effect.
Figure 43.
Relative variation of peak power versus junction temperature
()
3
40
40
2
ln
2
10
35
.
20
RBO
Rd
tp
+
*
=
-
-
2
63
.
0
120
4
28
1
60
10
9
nom
tp
tp
e
Rd
⎟⎟⎠
⎞
⎜⎜⎝
⎛
-
=
*
*
-
-
Ppp
Ipp
Vcl
Ppp
549.25 W
=
⇒
*
=
1
2
5
10
20
50
100
0.1
0.2
0.5
1.0
2.0
5.0
10.0
Transil T1
Transil T2
tp(ms)
Ppp(kW)
0
25
50
75
100
125
150
175
0.00
0.20
0.40
0.60
0.80
1.00
1.20
Tj initial (°C)
Ppp[Tj]/Ppp[Tj initial=85°C]



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