FOD4116

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Optoisolators are widely used in industrial, medical and consumer products, but the most popular type is the FOD4116 optoisolator. The device provides an effective electrical isolation between two different circuits, which allows different voltage levels between the two circuits. The FOD4116 optoisolator is available in a triac, SCR (silicon controlled rectifier) output version. This article provides an overview of the application field and working principle of the FOD4116.

Application Field

The FOD4116 optoisolator is most commonly used in applications that require electrical isolation and the switching of AC loads. The optoisolator can be used to turn on or off devices such as relays, motors, solenoids, transformers, lamps, and other loads with a triac or SCR control signal. The FOD4116 is also used in applications where the power supply voltage and/or the load voltage are different from each other, such as a system where the power is supplied by one voltage level and the load needs to be powered at a different voltage. The device is especially suitable for controlling LED dimmers, as it prevents any switching noises and overvoltage damage to the LED circuits.

Working Principle

The FOD4116 optoisolator works by using an optical signal to control a load. It consists of a photosensitive device (a photo diode) and a power switching device (a triac or SCR). The photo diode senses the optical signal coming from the input, which is typically a logic-level voltage. The device then generates a control current in response to this input signal. The control current is then used to switch on or off the triac or SCR device, which in turn is used to control the load. The optoisolator also provides both electrical and optical isolation, which prevents any electrical signals from the input side from being transmitted to the load.

The FOD4116 optoisolator is designed to work between 50-600V AC. The AC load is connected to the phase and neutral lines of the AC power line. The optoisolator can be triggered with an input logic voltage of 1.5 to 24 V. When the input signal is received, the photo diode generates a control current which is used to switch the power device on or off. When the power device is switched off, the AC load is disconnected from the AC power source, and when it is switched on, the AC load is powered.

The FOD4116 optoisolator offers a wide range of benefits, such as low power consumption, long service life, and high isolation voltage. It also provides protection from overvoltage and current surges. The device is established as a cost-effective solution for many industrial, medical and consumer devices. It is available in a variety of sizes and packages.

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