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AN2689 Folha de dados(PDF) 23 Page - STMicroelectronics

Nome de Peças AN2689
Descrição Electrónicos  Protection of automotive electronics from electrical hazards
PDF  42 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2689 Folha de dados(HTML) 23 Page - STMicroelectronics

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AN2689
Supply rail protection
Doc ID 14310 Rev 3
23/42
4.3
Calculations for example 1
4.3.1
Determination of Rd
The voltage and current across the Transil are:
Because Rd is dependent on the surge current duration and because its value for
ISO 7637-2 pulse 2 is not given in the datasheet, it is necessary to determine it to solve the
equations. But this time the generator internal schematic is not provided and none of the
internal elements are known. So the easiest way to determine the current duration is to refer
to the generator characteristics that are given in Figure 29 and Figure 30. These curves
were produced from a SCHAFFNER NSG5500, MT5510 module. The voltage curve is for
open circuit and the current curve produced when terminations were short circuited.
Figure 29.
MT5510 output voltage in open circuit
Table 5.
SM15T33AY electrical characteristics (extract from datasheet)
Order code
IRM @ VRM
max
VBR @ IR
(1)
1.
Pulse test: tp < 50 ms.
VCL @ IPP
10/1000 µs
VCL @ IPP
8/20 µs
T
max(2)
2.
V
BR = T * (Tamb - 25) * VBR (25°C)
C
typ(3)
3.
VR = 0 V, F = 1 MHz.
min. typ. max
max
max
µA
V
V
V
V
mA
V
A
V
A
10-4/°C
pF
SM15T33AY
1
28.2
31.4
33
34.7
1
45.7
33
59.0
169
9.8
2700
Table 6.
SM15T33AY thermal parameter (extract from datasheet)
Symbol
Parameter
Value
Unit
Rth(j-a)
Junction to ambient on printed circuit on recommended pad layout
75
°C/W
Ipp
Rd
Vbr
Vcl
*
+
=
max
Rd
Rs
Vbr
Vs
Ipp
+
-
=
max
Test conditions
50 V, 50 µs
Rs = 2
0.2 s period
Ω



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