CNX48USD

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Optoisolators - Transistor, Photovoltaic Output offer a variety of advantages in many automation applications. The most significant is the capability to provide electrical isolation between two separate systems, allowing signals to be exchanged in a safe manner and reducing the potential for damage due to electrical shocks, electromagnetic interference or spikes. The CNX48USD is one type of such isolator, offering a variety of features and benefits.

Applications

The CNX48USD is a device designed to provide a simple and reliable method of electrical isolation between two systems that transfer analogue or digital signals. They are used in a variety of applications from industrial automation and process control to medical instrumentation and instrumentation. Some common applications include:

• Video signal isolators
• PLC (Programmable Logic Controller) signal inputs/outputs
• Elevator/escalator system signal functions
• Data acquisition/logging
• Process control
• Building safety systems
• Telecommunication remote switch control
• Medical instruments

Features and Benefits

The CNX48USD has some unique characteristics that make it an ideal choice for electrical isolation applications. These features include:

• Compact, low cost, and highly reliable
• Extended temperature range from -40° Celsius to 85° Celsius
• High-speed switching: 0.3ms maximum fall/rise times
• High optical-to-electrical isolation voltage: 4000 VRMS
• Two current transformer inputs (5V and 10V)
• Wide range of input voltages and currents (6-20V DC and 3.5-25mA DC)
• Wide range of output voltages (2.0-34V DC)

These features provide many advantages to the user, including improved safety, data-handling accuracy, speed, and cost savings. By isolating the two systems, one can eliminate the possibility of accidental contact with electric shock, reduce electromagnetic interference and spikes, and improve data handling accuracy.

Working Principle

The CNX48USD is a photovoltaic isolator that works on the principle of a transistor coupler. It consists of two isolated sections: the photo-sensitive section and the transistor coupler. The photo-sensitive section is composed of two photocells connected in reverse series (PNP type) and a common anode. These photocells receive the input signal from one of the systems and convert it to an electrical current. The transistor coupler then transfers this current to the other system, effectively isolating the two systems electrically.

In operation, when the input signal is applied to the photocells, they produce a current that is then amplified by the transistors. This amplified current is then transferred to the output, thus isolating the two systems. The CNX48USD can also be used to provide optically isolated feedback signals when used in conjunction with a photointerrupter or other optical sensing devices. This device offers high speed (up to 500kHz) and excellent isolation performance, making it an ideal choice for applications with stringent isolation requirements.

Conclusion

The CNX48USD is a highly reliable, cost effective, and simple to use isolated optoisolator for use in a variety of applications. Its features provide benefits such as improved safety, data-handling accuracy, speed, and cost savings. Its photovoltaic structure offers high isolation voltage and fast switching, making it a great choice for applications that require high-speed signal transfers and stringent isolation requirements. The CNX48USD provides a reliable, low-cost solution for many automation applications.

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