LOC117S

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Optoisolators - Transistor, Photovoltaic Output - LOC117S application field and working principle

LOC117S, an optoisolator commonly known as an opto-coupler, is a semiconductor device used to isolate electrical signals between two circuits. Built from a LED and a photodetector, the LOC117S isolates its input from its output by emitting a light signal modulated by the input signal and detecting it on the other side. This makes it an ideal component for applications that require high voltage electrical isolation.

The LOC117S optoisolator combines a high speed Infrared-Emitting Diode and a Transistor Photocoupler. The pair is mounted in a 6-pin SOP or SMD package and offers an insulation of up to 500Vrms between input and output. The device accepts input voltages ranging from 4.5 to 16Vdc and it is capable of detecting a pulse width of up to 7ns across input and output. The two circuits are completely isolation while input and output signals are still coupled.

Application Field

The LOC117S optoisolator is used to electrically isolate inputs and outputs in numerous applications. Isolation is often required in high-voltage or motor control systems to prevent damage to the equipment and the operator. The device is typically found in communication systems, AC switches, AC drives and in power supplies across the industrial, technological and automotive industries.

Most of these applications require the transfer of voltage signals and can benefit from the maximum input/output voltage of 500Vrms. This voltage advantage ensures that the device can be used even in heavy machinery and applications with high electrical load without risking damage to the equipment.

Working Principle

The way LOC117S optoisolators work is by opting for a light coupling instead of a direct connection between the two circuits. The light information is transferred from the input to the output thanks to a LED semiconductor which emits infrared light. This light is captured by the output photodetector, which is composed of a phototransistor.

This means that, when electrically isolated, there is no connection between the input and the output of the optoisolator. The direct electric connection is replaced by a light signal pathway, which minimizes electrical interference between the input signal and the output. This both eliminates the need for an external power supply and increases the safety of the application.

The input circuit is the part that is prone to signal noise, often generated by electric fields, radio frequency interference or crosstalk. When such interference occurs, the input signal can be distorted by the parasitic signals making it input signal no longer faithful to the original. In LOC117S optoisolators, the input signal is transferred to the output without any degradation or loss of quality.

Conclusion

The LOC117S optoisolator is a reliable and versatile device designed to safely isolate electrical signals between two circuits. With a maximum voltage of 500Vrms, it is capable of operating in demanding applications across numerous industries. The infrared LED – phototransistor design ensures that the data being transferred is safe from external electric interference or noise. The device is fanstastic solution for applications that need both electrical isolation and the transfer of high voltages.

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