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Optoisolators - Transistor, Photovoltaic Output

The CNY17F2VM is an opto (optical) coupler, also known as an opto-isolator, which is designed to provide an electrical isolation barrier between two parts of a circuit. It contains a photosensor which is used to detect light input and a transistor output, allowing it to function as a solid-state switch. By using a photosensor, the CNY17F2VM can provide both isolation and isolation protection to circuits.

Applications

The CNY17F2VM opto-isolator is designed to be used in a variety of applications which require electrical isolation between two signals. It is commonly used in motor control circuits, industrial power supplies, office automation systems, and digital logic circuits. The isolation provided by the opto-isolator can be used in safety applications, where it prevents current flow back into the circuit if an external circuit is interrupted.

Working Principle

The CNY17F2VM opto-isolator contains a light-detecting photosensor, which can be either a photo transistor or a photovoltaic cell depending on the model. When light is detected by the photosensor, a current is generated and passed through the LED chip to the output transistor, which controls the switching of the device. The current is regulated by the voltage on the base of the transistor.

The voltage on the base terminal of the transistor is also controlled by the photovoltaic cell built-in to the opto-isolator, which is charged by the light it receives from the LED chip. When the photovoltaic cell is charged, it produces a voltage, which is then applied to the base terminal of the transistor, turning it off.

When light is no longer detected by the photosensor, the opto-isolator will remain in the off state. In order to turn it back on, the voltage must be manually re-applied to the base of the transistor. The CNY17F2VM opto-isolator can be used in a variety of applications where electrical isolation is required such as motor control, industrial power supply, office automation systems and digital logic circuits.

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