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AN4275 Datasheet(PDF) 3 Page - STMicroelectronics |
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AN4275 Datasheet(HTML) 3 Page - STMicroelectronics |
3 / 11 page 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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