In addition, these digital isolators must meet appropriate Safety Standards as required by end safety agencies such as UL, CSA, VDE, and CQC. Once an appropriate device is identified and designed in, the system designer can proceed with their system evaluation in their typical fashion. With the isolation rating, there may be package options to consider given the system environment.Īfter a designer has decided to make the switch, the first challenge is to select the correct digital isolator for each application. Transient noise immunity, and electromagnetic emission profile are other considerations related to the isolation structure. On the isolation performance side, it is important to gain an understanding of the isolation rating your system needs. Timing specifications, such as propagation delay, should be appropriate for your system. On the feature set side, consider the number of isolation channels and the channel configurations. Digital isolation components easily provide multichannel isolation solutions with a much smaller footprint, increase system reliability due to a lower failure rate, offer twice the electrical noise immunity, operate over a wider temperature range (-40 ℃ to 125 ℃ ), and do not age or degrade over time.įeature set and isolation performance are both factors to consider in selecting a digital isolator. This reduces performance over the device’s lifetime. Optocouplers, although incorporated in many designs, are based on outdated LED-technology that provides significant output variation over input current, temperature, and age. With this technology, performance and feature integration are both improved. To do this, digital isolation devices use semiconductor process technology to create either transformers, or capacitors to transfer data instead of light. Optocouplers consume high levels of power, are prone to aging and temperature effects, and provide limited data rates, often below 1Mbps.ĭigital isolation devices, on the other hand, were created to meet safety regulations while maximizing the benefits of modern CMOS technology. The LED turns on for logic High and off for logic Low. The traditional optocoupler is a hybrid device that uses LED light to transmit data across an isolation barrier to a light detector. Performance, efficiency, size, and cost are all things that can be affected when adding isolation devices. Modern digital isolation allows for massive integration, which means that circuit component count can decrease. Isolation devices allow multiple power domains to coexist and communicate, which means that sensitive circuits are protected from switching circuits. Adding isolation components usually improves circuit performance and improves component safety. In all cases, the isolation components add value to the system by enabling additional functionality and ensuring safe operation of the system. Isolators used in the industrial market are mainly used for component protection, user safety, signal level shifting, and adherence to safety regulations. In many terminal units, this new isolation component has gradually replaced the traditional optocoupler. After the breakthrough of silicon-based isolation technology, digital isolators that are smaller, faster, and more stable and have a cost advantage have emerged. In the past 40 years, optocouplers have often been used for signal isolation components. In particular, since industrial electronic equipment must operate stably in harsh environments full of unstable factors such as strong electromagnetic fields, surges, fast transients, high noise floors, etc., in order to ensure that a device can operate without faults for a long time in this environment, a reliable isolation circuit has become a must-have. Isolators are widely used in electronic circuit design, especially in industrial electronic equipment, which usually uses DC isolation to prevent potential high voltage hazards from harming the system and users. Digital Isolators Gradually Replacing Optocouplers
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |