External, high voltage transients that interact with a system’s analog input and output nodes can damage the integrated circuits (ICs) within the system if they are not adequately protected. In this article from Analog Devices, learn about EMC regulations, specialized methods used to help protect against transients, and expected outcomes.
IEC61000
IEC61000 is the group of electrical engineering standards that covers EMC robustness at the system level. Subsections 4-2, 4-4, and 4-5 are written to deal with high voltage transients. The primary purpose of these standards is to determine the immunity of systems to external electrostatic discharge (ESD), electrical fast transients (EFT), and electrical surge events. The evaluation methods include the definition of waveforms, the definition of test procedures, and benchmarking of test results.
Transient Voltage Suppressor
A transient voltage suppressor (TVS) is used to suppress voltage surges by clamping high voltage transients or shunting large currents away from sensitive circuitry. When designing in a TVS, it’s important to consider the working peak voltage, the breakdown voltage, and the maximum clamping voltage. These three factors, governed by the product’s intended application, will govern how well the TVS is able to contain any transient surges.
Analog Input Protection Circuit
In order to fully protect a system input/output node, the system must be protected against DC overvoltages and high voltage transients. This can usually be accomplished by installing an overvoltage protection switch at the system input.
Conclusion
Be sure to click through to the article for greater detail about designing products that meet the standards laid out in IEC61000. Benefits include ease-of-design, faster time to market, and higher circuit performance.