EL817(S1)(A)(TD)-G

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Optoisolators are components that are used to electrically insulate one circuit from another. The EL817 series optoisolators from Everlight Electronics are components that are specifically designed to provide a single transistor photovoltaic output. These optoisolators can be used to transfer low voltage signals from one circuit to another while ensuring complete electrical isolation between the circuits. They can also be used to protect electronics from overvoltage or overload conditions. In this article, we will look at the application field and working principle of the EL817 series optoisolators.

Application Field

The EL817 series optoisolators are designed for use in a variety of applications where electrical isolation is required, such as industrial automation, measurement and control, building automation, and other industrial systems. They can be used in systems where low voltage signals need to be transferred from one circuit to another. They are also used in systems where their electrical insulation properties can provide protection against overvoltage or short circuit conditions. They can also be used in systems that require automatic resetting of control signals or that require automatic resetting of a controller or process.

working principle

The EL817 series optoisolators consist of an LED deriving all the necessary electricity from the input supply and a phototransistor on the other side of the optoisolator which receives light from the LED and converts it into an output electrical signal. The phototransistor includes a collector, collector resistor, and base resistor, which are connected in series between the output and ground. When the input current flows through the LED, the light emitted from it turns on the phototransistor and allows current to flow from the collector to the output, providing a signal from the output.

The collector resistor of the phototransistor is connected in series with the base resistor of the phototransistor, and this creates a voltage divider which limits the output voltage to a set level. The LED is also reverse biased with a zener diode that protects it from transient low voltages. This also protects the phototransistor from false triggering.

The EL817 series optoisolators can also be used in applications requiring pulse width modulation (PWM) or other forms of width control. The LED and phototransistor are connected in a single device, so the only required connections are from the input supply to the LED and from the output to the phototransistor. The device also has a high isolation voltage and fast response time, making it suitable for controlling signals in high-speed systems.

Conclusion

The EL817 series optoisolators from Everlight Electronics are components that are specifically designed to provide a single transistor photovoltaic output. They are designed to provide electrical isolation between circuits and can also be used to protect electronics from overvoltage or overload conditions. They are used in a variety of applications such as industrial automation, measurement and control, and building automation, and have a high isolation voltage and fast response time.

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