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AN4275 Datasheet(PDF) 3 Page - STMicroelectronics

Part # AN4275
Description  The objective of this document is to briefly
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4275 Datasheet(HTML) 3 Page - STMicroelectronics

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DocID024389 Rev 1
3/11
AN4275
IEC 61000-4-5 definition
2
IEC 61000-4-5 definition
2.1
Classes and voltage levels
The standard specifies different classes depending on where the equipment is installed. For
each class a corresponding peak voltage is applicable (see Table 1).
Starting at a 500 V surge, it is generally required to protect the equipment with a specific
device.
2.2
Surge generator
The generator used to model the surge is described in Figure 1.
Figure 1. IEC 61000-4-5 surge generator
In open mode, the generator delivers a 1.2 µs/50 µs voltage waveform, and in short circuit,
the current waveform is 8/20 µs. This kind of generator is called a combination wave
generator. The surge is shown on Figure 2 and Figure 3.
Table 1. Classes and voltage levels
Class
Environment
Voltage level
0
Well protected environment, often in a special room
25 V
1
Partially protected environment
500 V
2
Electrical environment where the cables are well
separated, even at short runs
1 kV
3
Electrical environment where power and signal cables
run in parallel
2 kV
4
Electrical environment where the interconnections
include outdoor cables along with the power cable, and
cables are used for both electronics and electric circuits
4 kV
5
Electrical environment for electronic equipment
connected to telecommunication cables and overhead
power lines in a non-densely populated area
Test level 4
1.2 µs/50 µs surge generator source
Rout = 2 W
Rext


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