Electromagnetic compatibility (EMC) requirements

AN2482

12/18

4

Electromagnetic compatibility (EMC) requirements

The input and supply pins are designed to withstand electromagnetic interferences. They

bursts (±4 kV, IEC 61000-4-4) and the voltage surges (±1kV, IEC 61000-4-5).

EMC test procedures are fully described in AN1608 CLT3-4BT6 application note. Refer to it

to get detailed information. It covers IEC 61000-4.2 standard for ESD tests, IEC 61000-4.4

standard for fast transient burst tests, IEC 61000-4.5 standard for surge tests,

IEC 61000-4-6 standard for conducted disturbance tests.

IEC 61131-2 standard for programmable controllers specifies (see section 7.3.3 of the

standards document) a low profile requirement for digital inputs with:

●

High energy Surge = 0.5 kV

●

Fast Transient Burst = 1 kV

●

Electrostatic Discharge = 4 kV

●

But designers are requiring now improved robustness levels:

●

4 kV EFT burst;

●

500 V at least in surge

●

ESD 15 kV air

●

The PCLT demo board described here sustains the levels given on Table 2.