CNX82A300W

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Opto-isolators, also known as photocouplers and opto-couplers, are electronic components that allow for electrical isolation between two otherwise connected electrical circuits. The CNX82A300W is a type of opto-isolator that uses a combination of a photovoltaic and transistor output mechanism to provide its isolation. This article will explore the applications and working principles of the CNX82A300W for engineers and other interested parties.

Applications of CNX82A300W

The CNX82A300W is commonly used in motor control, medical equipment, power control, and ground isolation applications. Its output is well-suited for optically isolated low voltage controls, as its maximum voltage is 30 V and maximum current is 100 mA. As the CNX82A300W is relatively small and has low power consumption, it is also widely used in applications requiring miniaturization and space saving.

The CNX82A300W is also suitable for applications involving high noise immunity and long transmission lines. As noise immunity isn’t affected, even if the transmission lines are long, it proves to be reliable in applications that require common mode noise reduction and/or isolation of power lines. In addition, CNX82A300W’s high voltage withstand rating makes it ideal for high voltage applications.

Working Principle

The working principle of the CNX82A300W can be simplified to the following. The circuit consists of an infrared light-emitting diode (LED) that is driving by an input voltage to create optically isolated voltage in the collector-emitter circuit of a phototransistor. When the LED is turned on, it emits light in the direction of the phototransistor, exciting the phototransistor causing it to turn on. This creates an output current within the collector-emitter circuit of the phototransistor, and the output is taken from the collector. When the LED is turned off, the phototransistor turns off and no current is available at the output.

This bi-directional opto-isolator circuit helps prevent current flow from the output back to the power source, thus, providing electrical isolation. The circuit also helps reduce the propagation of electrical noise, ensuring reliable operation and a low-noise environment. Furthermore, LED leakage current is minimized by using a low ON-resistance, which helps minimize power loss.

Conclusion

The CNX82A300W opto-isolator has found widespread use in many industrial, medical, and power control applications due to its small size, low power consumption, and high noise immunity. Its combination of high voltage withstand rating and photovoltaic/transistor output mechanism makes it ideal for ground isolation and low voltage control applications. Its working principle is fairly straightforward, and helps to reduce electrical noise while providing a reliable level of electrical isolation.

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