HCPL-4503-320E

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Optoisolators are electronic components used to isolate two circuits electrically yet still allow them to be able to communicate. The HCPL-4503-320E is a part of this family and is created by Avago Technologies. This part is an optoisolator that uses a transistor and photovoltaic output to provide functional isolation between two transmission gates. This device makes use of the model HCPL4500 VDE0884 optoisolator family. The following discusses its application field and the working principle of how it operates.

Application Field

The HCPL-4503-320E is primarily designed for applications that require greater input-to-output isolation. It can be used in times of due to its high transfer impedance capability. This transfers 2.5mA or more of current and can also support higher voltage levels across its outputs. Consequently, this feature allows it to handle both lower and higher input power signals. It can also handle signal transmissions considering that it has a low “on” resistance value of 0.2 Ohms. It is ideal for a wide range of communication applications that involve RS-485, CAN, Ethernet, or displays with a LVDS interface. Furthermore, the HCPL-4503-320E can also be used for power switching circuits, such as motor controllers, HVAC, industrial regulating processes. Overall, the HCPL-4503-320E is designed to be a versatile device that can easily fit into any application domain where reliable optoisolator-driven signal transmission and power switching is required.

Working Principle

The HCPL-4503-320E is a transistor-based optoisolator. It is composed of two components linked using optical isolation, known as the photo transistor and light-emitting diode (LED). The LED is connected to the emitter terminal of the transistor, and the collector and base are used respectively for input and output. The LED is located on the input side of the optoisolator and acts as the transmitter. The photo transistor is placed in between the LED and output and acts as a receiver. It receives the light emitted by the LED. The design of the optoisolator uncouples the input signal by providing up to 5 kV of electrical isolation between two digitally connected components.

The light energy released by the LED causes electrons to be excited in the sensitive layer of the photo transistor. When the light intensity falls within the photo transistor’s range of sensitivity, this action increases the conductivity of the emitter-collector junction and helps to create a voltage drop. Consequently, the optoisolator provides the required amplification to generate a signal level suitable for powering the output device. Finally, due to its high input insulation voltage the HCPL-4503-320E can operate under extreme conditions.

Conclusion

In conclusion, Avago Technologies seamlessly combines two technologies to create the HCPL-4503-320E optoisolator. This device makes use of the model HCPL4500 VDE0884 optoisolator family. It is generally utilized in applications that require greater input-to-output isolation. This optoisolator utilizes a transistor and photovoltaic output to provide functional isolation but still allow communication between two transmission gates. Finally, the HCPL-4503-320E is suitable for use in various applications thanks to its high transfer impedance and low “on” resistance value.

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