ELD217

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Optoisolators provide isolation between two circuits by using a beam of light to pass signals from an input to an output. In a transistor-output isolator, a light-emitting diode provides the light source, and the output is controlled by a transistor in the form of an emitter-coupled logic circuit. The ELD217 application field and working principle fits into this category of isolator.

The ELD217 features an integrated circuit consisting of a photodiode and a field-effect transistor (FET) with a Schmitt trigger. The FET is driven by the photodiode, which contains a low-gain photovoltaic amplifier, when light is emitted from a remote source. The FET enhances the current controlled by the photodiode and provides an amplified output signal. The Schmitt trigger helps stabilize this output signal.

The ELD217 is designed to be used in applications where the input and output are electrically isolated, and the output is current-limited. Common uses for this type of isolator are in computer systems, industrial control systems, and telecommunications.

The key features of the ELD217 include high efficiency, low input drive requirements, low power consumption, and fast response. The device does not require the use of an additional power supply, as its power is drawn from the LED signal itself. The ELD217 can operate over a wide range of temperature ranges and is highly immune to electrical noise.

In application, the photodiode of the ELD217 can be illuminated directly by an LED, a phototransistor, or any other light emitting element. The transistor output, which is activated by the light signal from the diode, is used to provide a digital signal. This signal is then further processed by the Schmitt trigger for a faster response. The device has excellent signal-to-noise ratio, and the output can be used in applications requiring high-power switching.

The ELD217 is an ideal choice for applications that require reliable data transmission across long distances with minimal power loss. Its high efficiency and low power consumption make the device suitable for use in hazardous environments, including oil and gas pipelines, as well as harsh industrial settings. Furthermore, installation is relatively simple. As such, the ELD217 is an ideal choice for any application where isolation is crucial.

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