PS2705-1-F3

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The PS2705-1-F3 series is an optoisolator from Vishay Intertechnology which is classified as a transistor, photovoltaic output device. Its main advantages are its high-voltage isolation, with ratings up to 2000 Vrms, and its very low forward voltage drop at 1.65V max. This device contains a gallium arsenide infrared emitting diode (IRED), optically coupled to a photovoltaic silicon detector mounted in a 4-pin dual-in-line package.

The main application fields for this specific optoisolator are driving and controlling high voltage DC motors, and controlling high power switching devices such as thyristors, relays and solenoids. This optoisolator provides a total data pathway isolation, making it ideal for data protection in sensitive remote instrumentation applications. It is also used for circuit protection and isolation purposes such as isolating current sensors, monitoring test equipment, and controlling interface circuits in non-isolated places.

The working principle of PS2705-1-F3 optoisolator is quite simple. When a current passes through the IRED, the diode emits an infrared light which triggers the photovoltaic detector. The detector then converts this light into a voltage, which is then used to activate the output transistor. The output transistor acts as a switch, allowing current to flow through the circuit or to be stopped from flowing depending on the applied voltage.

The PS2705-1-F3 offers an isolated power supply, which is provided by connecting the input and output sides of the device. This allows the input side to be powered from a different, isolated power source than the output side. This feature helps to protect sensitive circuits from overvoltage and noise. In addition, the device is also reverse voltage protected, so if the input voltage is reversed, the device will not be damaged.

The output of the optoisolator is a transistor with a maximum current of 50mA and a switching frequency of 200kHz. The device also has a wide range of temperature capability, from -25 to +85 degrees Celsius. It also has an excellent common mode transients immunity, as it can stand up to 15kV/μs.

Overall, the PS2705-1-F3 optoisolator series from Vishay Intertechnology provides a reliable, flexible, and cost-effective solution for driving and controlling high voltage DC motors, as well as for protection and isolation purposes. Offering very low forward voltage drop, high voltage isolation, and reverse voltage protection, this device is ideal for sensitive remote instrumentation and other industrial applications.

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