FOD4118SV

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Optoisolators are useful devices that provide electrical isolation between a signal and the circuit it is connected to, allowingfor a signal to be transmitted while protecting equipment and circuitry from harmful electrical noise and erroneous signals. The FOD4118SV is an optoisolator that utilizes a Triac and SCR output for applications such as AC motor speed control, LED dimming, and appliance control.

The FOD4118SV is designed to provide optoelectronic isolation between the output side of a signal isolator and an AC load. The isolator is made up of a two-stage optoisolator circuit which includes an LED optoisolator and a two-element MOSFET optoisolator. The two-stage circuit provides increased current transfer ratio by eliminating the potential for reversed biased transfer.

The LED optoisolator is made up of two parts, an input optoelectronic element and an output photo-coupler. The input optoelectronic element is powered by a voltage ranging from 80V to 280V AC. The output photo-coupler consists of two MOSFETs which are connected in a way that when triggered by the input optoelectronic element, produces an output pulse that is used to switch the Triac and SCR outputs.

The FOD4118SV is designed to work in any system up to 280V AC, with a trigger current of 2mA and a maximum working current of 4A, making it a reliable and durable solution for optoelectronic isolation of AC electrical signals. The built-in thermal protection circuit ensures safe operation of the device, while the short and over-current protection functions provide additional protection and reliability.

The FOD4118SV is commonly used in AC motor speed control applications where it is used to provide the necessary isolation between AC signals for safely controlling the speed of an AC motor. They are also used in LED dimming applications, where the optoisolator provides isolation between the dimming control circuit and the LED’s which helps to protect the circuit from erratic signals caused by changes in the LED’s current draw.

Finally, the FOD4118SV is often used in appliance control applications due to its ability to provide reliable isolation between the control circuitry and the appliance under control. This helps to protect the circuit from high electrical noise, voltage transients, and erroneous signals.

In summary, the FOD4118SV optoisolator offers reliable electrical isolation between a signal and the circuit it is connected to. It is designed to work at AC voltages up to 280V with a trigger current of 2mA and a maximum working current of 4A. It can be used in applications such as AC motor speed control, LED dimming, and appliance control to protect circuits from electrical noise and erroneous signals.

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