HCPL-7721-520

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Optoisolators, sometimes referred to as optical couplers, are an integral part of electrical systems, offering solutions for high voltage power transmission, circuit protection, and data conversion. In particular, optoisolators with integrated logic output, such as the HCPL-7721-520, offer higher protection than those without logic output, allowing for reduced system complexity and improved safety. This article will explain the application field and working principle of the HCPL-7721-520.

The HCPL-7721-520 is an optoisolator with integrated logic output designed for industrial and commercial AC/DC systems. It provides a galvanic isolation of 500VACrms between a control input and a control output, allowing for the control of critical circuits with a high degree of protection. The HCPL-7721-520 also features logic output, increasing the accuracy and reliability of the optoisolator and reducing the need for external logic components. Its working temperature range from -40 to +105°C, making it suitable for a wide range of applications.

The HCPL-7721-520 is suitable for a variety of applications, including LED driver circuits, consumer electronics, motor control, inverter controls, DC-DC converters, solar chargers, power supplies, and various other applications requiring control input and galvanic isolation. The logic output allows the circuit to be controlled by logic signals, reducing system complexity and improving system reliability.

The HCPL-7721-520\'s operating parameters are determined by its internal circuit design. Its internal configuration consists of a P channel MOSFET connected to the control input, a photodetector connected to an LED light source, and two circuits that detect the logic input. The LED and photodetector are arranged to form an optocoupler, providing the necessary galvanic isolation between the control input and the output. The logic circuit is designed to detect logic signals from the input side and generate the necessary output signals on the output side.

The HCPL-7721-520 is designed to operate at a minimum input voltage of 1.8V and a maximum input voltage of 5.5V. The input-output current transfer ratio is typically 3000:1. The output voltage is typically between 0-20V, but can be adjusted to other voltage levels. Its response time is typically 150ns, but can be adjusted depending on the application. The HCPL-7721-520 is also protected against short-circuits and over-voltage/current.

The HCPL-7721-520 is a powerful optoisolator that offers improved protection, flexibility, and system complexity. Its wide working temperature range and increased accuracy make it an ideal option for DC/DC converters, LED drivers, and various other applications that require control input and isolation. The logic output makes it easier to implement logic circuits and monitor the state of the circuit, improving system reliability and performance.

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