FOD817AW

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Optoisolators, also known as optocouplers, are semiconductor devices used to isolate an electrical signal. They are used to isolate two circuits electrically while still allowing a signal to pass from one circuit to another. The FOD817AW is an optoisolator that uses a transistor as the output device. This article will discuss the application field and working principle of the FOD817AW.

Application Field

The FOD817AW is a photovoltaic output optoisolator. It is a small package optoisolator with an overall package size of just 4.6 mm x 5.7 mm, making it very suitable for high-density designs and space-limited applications. It is the ideal choice for applications requiring high performance optoelectronic isolation with TTL compatible inputs and photovoltaic outputs.

The FOD817AW is particularly suitable for use in a variety of applications such as industrial control, high-frequency motor control, audio equipment, and safety controls in automotive systems. It is also suitable for high-speed logic isolators, DC-DC power supply isolation, and input/output buffers for computers and peripherals.

Working Principle

The FOD817AW has a reliable and robust construction, consisting of an LED, an integrated chip circuit, and a photovoltaic output transistor. It works on the principle that when the LED is activated, it will emit photons which are then converted into electric current by the photovoltaic output transistor. The electric current produced by the transistor will then be outputted from the device.

The integrated chip circuit ensures that only a certain amount of current is produced by the photovoltaic transistor and provides the logic level necessary for the inputs. The logic outputs from the integrated circuit are then used to control the voltage from the photovoltaic output transistor. In addition, the integrated circuit also provides a current limiting circuit for the LED, ensuring that it is operated in a safe and reliable manner.

The FOD817AW operates at aworking voltage range of 3.3V to 24 VDC and can operate at up to 125kHz switching frequency. It can handle load currents up to 500 mA, making it highly suitable for a variety of applications. One significant advantage of the FOD817AW is its isolation voltage, which is rated between 1500V and 5kV.

Conclusion

The FOD817AW is an optoisolator that uses a transistor as the output device. It is designed with an integrated chip circuit to provide a high level of functionality and logic isolation, and a photovoltaic output transistor to provide the necessary electric current. It is suitable for a variety of applications where reliable electro-optical isolation is required, such as industrial control, audio equipment, and safety controls in automotive systems. The FOD817AW has a wide operating voltage range, up to 500mA handling capacity, and a high isolation voltage, making it an ideal choice for demanding applications.

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