IL612-2

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Digital Isolators are semiconductor components with two independent parts, which can transfer digital signals and circuit elements between electronic circuits without isolation, creating mutual electrical isolation between the two circuits. Digital Isolators are widely used in communication and automation systems in many industries such as telecom, automotive, energy and automation, and especially in hazardous environments. This article will discuss the application field and working principles of the IL612-2 digital isolator.

Applications of IL612-2 Digital Isolator

The IL612-2 digital isolator combines a logic circuit built on a digital IC and two high speed Isolation Amplifier (or Isolation Amplifier) chips, and is a high-performance, isolated switch-mode digital isolator. It is suitable for transferring digital signals of various control systems in multi-channel and multi-module communication systems, which can be used for isolating the transmitted signal from interference and ensuring the reliability of the transmitted signal. Moreover, the IL612-2 digital isolator also combines logic and IA chips into one structure, which reduces large-scale system isolation circuits, interfaces and communication cost and provides solutions for multiple channel and high-performance isolation.

IL612-2 digital isolators are also ideally suited for medical, smart grid, and IOT applications, as they are designed to minimize isolation capacitance, and further reduce power consumption and EMI. In addition, IL612-2 digital isolators are compact, having a total height of just 3.3mm and a wide supply voltage range from 3.3V through 5.5V, making them ideal for applications which may require multiple power domains. This makes the IL612-2 digital isolator suitable for many applications, such as industrial and machine automation, medical equipment, isolating communication port signals, power isolation, and PoE (Power Over Ethernet) switches.

Working Principle of IL612-2 Digital Isolator

The main principle of IL612-2 digital isolator operation is based on the transfer of signal power from the IA chip to the control IC via two sets of gallium arsenide optics, hence the term \'optical coupling\'. The primary side of the IA chip is powered by a DC voltage, the full drive of which generates an optical signal of about -12 to +12V, which is then transferred to the secondary side. On the secondary side, the optical signal is converted to corresponding logic levels by the internal microcomputer.

The IA chip is also powered by a different input voltage independent from the primary side; the optical signal is then passed through to the secondary side via a variety of path lengths and directions, depending on the device’s design. After conversion, the logic level signal will be fed to the output pins of the device. To further ensure isolating function, the design incorporates an LM292 high-speed optocoupler in the feedback loop connecting both sides. This device is only used in IL612-2 digital isolator, and it can provide a higher level of signal isolation and significantly reduce the potential for errors in communication.

In addition, the highly integrated design of the IL612-2 also achieves data rate up to 4Mbps, which is significantly higher than many competitors. Thus, the IL612-2 not only isolates high-speed signals and reduces line interference, it also increases transmission efficiency and reliability.

Conclusion

IL612-2 digital isolator is a high-performance device suitable for many applications. Its application field ranges from general industrial automation, machine automation, medical equipment, power isolation, signal isolating and PoE switches. The working principle of the device is based on optical coupling, where a DC voltage is converted to optical signal in the primary side and then transferred to the secondary side, where it is converted back to the intended logic level signal. The advantages of this device include its high-speed data rate, high level of signal isolation, reduced power consumption, and reduced line interference.

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