FOD260LSDV Isolators

Optoisolators - Logic Output applications use fiber-optic couplings for isolation between the input lines and output lines, and supply level isolating devices to eliminate ground loops and short-circuits between circuits and reduce electromagnetic interference (EMI). FOD260LSDV is an example of this type of device.

FOD260LSDV Overview

FOD260LSDV is an opto-coupler-based low-side device (LSD) that provides level isolation and protection from electrical noise for logic circuits. It is equipped with a standard MOSFET (Metal-oxide-semiconductor field-effect transistor) output stage, dedicated to low output current applications, and is designed to prevent electrical shock and output short-circuiting. It works in combination with an isolator or a shunt regulator to protect and level-shift the logic signal.

FOD260LSDV Application Fields

FOD260LSDV offers isolation and protection for logic circuits in a wide variety of applications. It isolates the logic circuits from the rest of the system, providing protection from electric noise, short-circuiting, and other electrical hazards. It can be used in industrial circuits, for example, in machines, conveyors, robotics, and automated systems. Other applications include protection of logic signals from disturbances in telecommunications, medical and military systems, security systems, automotive industry, and test and measurement circuits.

FOD260LSDV Working Principle

FOD260LSDV works using an isolator, which couples separate electrical circuits without allowing the electricity from one circuit to flow directly into the other. The isolator uses a built-in optical Coupler to create an electrical signal in the output circuit, when the input signal is present. This is done by transmitting the logic signal from the input circuit, through an optical channel, to the output. The optical channel is composed of an LED (Light Emitting Diode), which is designed to emit the optical signal, and a phototransistor, which is designed to detect the optical signal and convert it into an electrical signal.

The LED of the isolator is connected to the input circuit, while the phototransistor is connected to the output circuit. The optical signal is modulated at the input side, then passes through the optical channel and is detected by the phototransistor. The electrical signal is then amplified by the MOSFET output stage, providing level isolation and protection to the output circuit. When the input signal is not present, the input circuit is isolated from the output circuit, thus protecting it from electrical disturbances.

Conclusion

The FOD260LSDV opto-coupler is a versatile low-side device capable of performing level isolation and protection of logic signals in a wide range of applications. Its optical channel and MOSFET output stage protect the output circuit from electrical noise, short-circuiting, and other electrical hazards. It is an ideal choice for industrial circuits, telecommunications, medical systems, and more.