LOC112

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Optoisolators, also known as optocouplers and photocouplers, are devices that use optical-electrical energy conversion for galvanic isolation of electrical signals. They are designed to provide galvanic isolation between two circuits, usually employing a light emitting diode (LED) and a photodetector in the same package, and are commonly used in the protection of low-voltage circuits from high-voltage overloads. One type of optoisolator, the LOC112, is a transistor-based, photovoltaic output optoisolator. It provides an integrated optically-isolated power-control switch in a single package, providing designers with an easy to use, compact solution to switch loads in low power, low voltage control applications.

The LOC112 optoisolator is based on a transistor output phototransistor, with a field-effect transistor (FET) transistor connected to the collector. The transistor\'s output is an open collector, and the connection to the output terminals can be either AC or DC. The FET is driven by a phototransistor input, which is in turn driven by an LED. The LED is typically driven by a current source, typically 5 to 20mA, depending on the model and application.

When the LED is off, the output transistor is turned off, and the phototransistor is reverse-biased, keeping the current off the output terminals. When the LED is on, the phototransistor is saturated, and the output transistor is enabled, allowing a current through the output terminals. This current is limited by the FET\'s maximum drain current, typically 0.2A, and the current is proportional to the LED drive current.The specific data is subject to PDF, and the above content is for reference