FODM3011R1_NF098

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Optoisolators, also known as optocouplers, provide galvanic isolation between a microprocessor or computer and the external circuitry it controls. Relying on a light emission from an emitting diode, such as an infrared emitting diode (IRED) in the input stage, they offer protection to the computer in the event of an overvoltage or system upset. The optoisolator device is then connected to an output stage such as a TRIAC, SCR, or logic gate, allowing for electronic control of various output stages. A common application for optoisolators is in temperature controllers, where they provide a communication link between an internal microprocessor and an external controller.

One such example of an optoisolator is the FODM­3011R1­NF098 from Opto Controls. This device is classified as an optoisolator ­ TRIAC, SCR Output. The device is a 4 pin single in line (SIL) package, comprising of an input stage IRED emitter and two separate output stages for a TRIAC and a SCR respectively. The emitter has a maximum rating of 200mA and opto­coupler isolation voltage of 5000V, making it suitable for use in high voltage applications. A nominal current of 5mA is required to maintain a minimum CTR rating of 100%. The outputs are complementary type, an engaging output is high while a disengaging output is low

The overall operating principle of the FODM­3011R1­NF098 optoisolator is fairly straightforward and easy to understand. An external power supply is connected to the input pins of the optoisolator, and an input signal to the emitter (IRED). The IRED component of the optoisolator generates light which is detected by the phototransistor/triac/SCR components. Depending on the nature of the input signal, the TRIAC/SCR output is turned off or on respectively. The output logic level is complementary to the input, so a low level input will turn the TRIAC/SCR output high, and a high level input will turn it off.

The FODM­3011R1­NF098 optoisolator is ideal for use in a variety of applications, particularly where safety and isolation requirements must be met. Typical applications include the control of light dimmers, electric motor speed controllers, and relays and switches for high voltage circuits. It is also commonly used in the industrial automation sector as an isolator between a PLC or computer controller and relays, solenoids and motors.

In summary, optoisolators are an important element in several safety and isolation circuits. By providing galvanic isolation, they provide protection to processing circuitry from electrical transients, overvoltages, and system upsets. The FODM­3011R1­NF098 optoisolator is a specific example of an optoisolator designed for the equally specific application of controlling TRIAC/SCR outputs in applications such as light dimmers, motor speed controllers, and industrial automation.

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