SIOV Metal Oxide Varistors - DEMAR

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Application and Design Examples Table 1 (continued) The following table shows the most important standards in the field of immunity to interference. Standard Test characteristics Phenomena Conducted interference EN 61000-4-4 IEC 1000-4-4 EN 61000-4-5 IEC 1000-4-5 EN 61000-4-6 (ENV 50141) IEC 801-6 Field-related interference EN 61000-4-3 (ENV 50140) IEC 801-3 5/50 ns (single pulse) 15 kHz burst 1,2/50 µs (open-circuit voltage) 8/20 µs (short-circuit current) 1 V, 3 V, 10 V 150 kHz to 80 MHz 3 V/m, 10 V/m 80 to 1000 MHz Burst Cause: switching processes Surge (high-energy transients) Cause: lightning strikes mains lines, switching processes High-frequency coupling Narrow-band interference High-frequency interference fields Electrostatic discharge (ESD) EN 61000-4-2 IEC 1000-4-2 Up to 15 kV figure 24 Electrostatic discharge The IEC 1000 or EN 61000 series of standards are planned as central EMC standards into which all EMC regulations (e. g. IEC 801, IEC 555) are to be integrated in the next few years. 3.2.1 ESD The trend to ever smaller components and lower and lower signal levels increases the susceptibility of electronic circuits to interference due to electrostatic disturbances. Simply touching the device may lead to electrostatic discharge causing function disturbances with far-reaching consequences or to component breakdown. Studies have shown that the human body on an insulated ground surface (e. g. artificial fiber carpeting), can be charged up to 15 kV. In order to safeguard the immunity to interference and thus ensure CE conformity, measures are needed to prevent damage due to electrostatic discharge (ESD). This applies to both the circuit layout and to selection of suitable overvoltage protection. EN 61000-4-2 describes the test procedures and specifies severity levels: Figure 24 shows the discharge circuit, figure 25 the waveform of the discharge current with an extremely short rise time of 0,7 to 1,0 ns and amplitudes of up to 45 A. Secondary effects caused by this edge steepness are high electrical and magnetic fields strengths. In the ESD test, at least 10 test pulses of the polarity to which the device under test is most sensitive are applied. 56 Siemens Matsushita Components
Application and Design Examples High-voltage source Device under test Figure 24 ESD discharge circuit according to EN 61000-4-2 Figure 25 ESD discharge current according to EN 61000-4-2 For this reason, suitable overvoltage protection elements must meet the following requirements: – response time < 0,5 ns – bipolar characteristics – sufficient surge current handling capability – low protection level Siemens Matsushita Components 57
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