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AN2689 датащи(PDF) 25 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) 25 Page - STMicroelectronics

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AN2689
Supply rail protection
Doc ID 14310 Rev 3
25/42
where Rs is the serial resistor of the generator. In this case Rs = 2 
So the surge generator capacitor is C = 2.7 µF. Therefore, when considering the use of an
SM15T33AY, the current duration at Ip/2 is:
(tp is the current duration through the SM15T33AY measured between Ip and Ip/2)
It is now possible to compare this current duration with the curve given in Figure 31.
For a current duration of 4 µs, the peak pulse power the SM15T33AY can dissipate is
approximately 20 kW.
Figure 31.
Peak pulse power versus exponential pulse duration
In the same way as for the previous examples, a derating factor needs to be considered
regarding the ambient temperature. For 85 °C ambient temperature the derating is close to
70% (see Figure 32). So the maximum peak power the SM15T33AY can withstand for a 4
µs is instead 14 kW.
Figure 32.
Peak power dissipation versus initial junction temperature
()
tp
A
T
SM
2
ln
14
.
0
2
10
7
.
2
6
33
15
+
*
=
-
µs
tp
A
T
SM
4
33
15
=
0.1
1.0
10.0
100.0
1.E-03
1.E-02
1.E-01
1.E+00
1.E+01
P
(kW)
PP
t (ms)
p
0
500
1000
1500
2000
0
25
50
75
100
125
150
175
P (W)
PP
T (°C)
j



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