CNY17F2S

Optoisolators are well-known devices for providing electrical isolation between two circuits, thus preventing electrical interference. The CNY17F2S is one of the more popular optoisolators and features a transistor and photovoltaic output. In this article, we will be exploring its application field and working principle.

Application Field

The CNY17F2S is a pretty versatile device and is commonly used in the following situations:

• Small Power Supplies: The CNY17F2S is often used in small power supplies, with a maximum rating of 35V and a burden voltage of 1.3V, making it ideal for use in low power circuits.
• Electronics Appliances: Due to its small size (2mm X 3.2mm) and wide power range (35V maximum rating), the CNY17F2S is a popular choice for use in consumer electronics, though it should not be used in high power applications like motor drivers.
• Protective Relays: It is commonly used in protective relays, where the optoisolator acts as a barrier between the control circuit and the load circuit, thus preventing interference and providing electrical isolation.
• Logic Isolation: The CNY17F2S can be used in logic isolation applications, where the transistor output allows for greater flexibility and accuracy.

Working Principle

The working principle of the CNY17F2S optoisolator is fairly straight-forward. The central component is a phototransistor, which features a transistor output and a photovoltaic output. It is a small-signal device that operates on the principle of photo-sensitive output:.

• Light from the LED enters the phototransistor, where it hits the base-collector junction and causes a “base-collector current” to flow, thus activating the transistor.
• This base-collector current also creates a static voltage, which is then used to turn on the photovoltaic cell.
• The photovoltic output then varies according to the amount of light which is present, which in turn allows for the optoisolator to provide isolation between two circuits.

The CNY17F2S optoisolator also features a maximum rating of 35V and a burden voltage of 1.3V, making it ideal for use in low power circuits. Furthermore, the small size (2mm X 3.2mm) makes it suitable for use in consumer electronics.

Conclusion

The CNY17F2S is a popular optoisolator that features a transistor and photovoltaic output. It is commonly used in small power supplies, electronics appliances, protective relays, and logic isolation applications, and its maximum rating of 35V and burden voltage of 1.3V make it ideal for use in low power circuits. Furthermore, its small size makes it suitable for use in consumer electronics.

We hope that this article has helped to understand the application field and working principle of the CNY17F2S optoisolator. Looking for more information on optoisolators? Check out our other articles on the subject.