IEC61000-4-2ESD performance
Exposed RS-485 connectors from encoders to motor drives and ESD on cables are a common system risk factor. The system-level IEC61800-3 standard associated with EMC immunity requirements for variable speed electric drive systems requires IEC61000-4-2ESD protection of ±4kV (contact) / ±8kV (air) minimum. The ADM3065E exceeds this requirement by providing IEC61000-4-2ESD protection of ±12kV (contact) / ±12kV (air). Figure 3 shows the comparison of the 8kV contact discharge current waveform and the human body model (HBM) ESD8kV waveform in the IEC61000-4-2 standard. As can be seen from Figure 4, the waveform shapes and peak currents specified by the two standards are different. The peak current associated with the IEC61000-4-28kV pulse is 30A, and the corresponding HBMESD peak current is less than one-fifth of this value, which is 5.33A. Another difference is the rise time of the initial voltage spike. For IEC61000-4-2ESD, the rise time is 1 ns, which is much faster than the 10 ns time associated with the HBMESD waveform. The power value associated with the ICESD waveform is significantly larger than the corresponding value of the HBMESD waveform. The HBMESD standard requires that the device under test (EUT) be subjected to three positive discharges and three negative discharges, while the IECESD standard requires 10 positive discharges and 10 negative discharge tests. The ADM3065E with IEC61000-4-2ESD rating is more suitable for operation in harsh environments than other RS-485 transceivers with a variety of HBMESD protection levels.
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