FOD4118 Datasheet/PDFOptoisolators are devices that use light to perform the electrical isolation between two circuits. FOD4118 is one type of optocoupler and it typically comes in two output form factors: Triac and SCR outputs. Both are voltage isolation AC-to-AC or AC-to-DC conversion of analog signals, achieving an electrical isolation up to 5000V.
FOD4118 Application Field
The FOD4118 is used in diverse applications like industrial control systems, home appliance controls, HVAC systems, programmable logic controllers (PLCs), and robotic controls. It is also commonly used for motor and lighting control applications as it offers low current consumption, high isolation voltage, and simple interface.
FOD4118 Working Principle
FOD4118 works based on the principle of transformer isolation. It consists of a photo-transistor which receives light energy from a light-emitting diode (LED) and converts it into electrical energy. This electrical energy is then sent and received by two different circuits. The signal isolation helps to suppressed voltage and current surges across the two circuits that may otherwise interfere with each other.
For the Triac output, it includes an insulated Thyristor and a photocoupler that can be used for switching AC load or controlling the speed of motors. The SCR output uses a photocoupler and a SCR to control DC loads with on/off switching. The turn-on voltage of FOD4118 is 8V and it\'s turn-off voltage is 3.4V.
FOD4118 also enables the two circuits to share information in a secure way. Additionally, this optocoupler has high temperature stability, low noise operation, and long lifespan. It combines both isolation and signal conversion functions into a single package.
Conclusion
The FOD4118 optoisolator is an important component in industrial automation systems, home appliance controls, and motor and lighting control applications. It performs the electrical isolation between two circuits and the signal conversion functions. This helps to prevent voltage and current surges across the two circuits and allows the secure transfer of information. The FOD4118 optocoupler typically comes in two output form factors: Triac and SCR outputs and the turn-on voltage is 8V and the turn-off voltage is 3.4V.