HCPL-7720-520E

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Optoisolators are composed of semiconductor optical devices such as diodes, photodiodes, and/or LED’s. When light emitted by a diode or LED of an optoisolator device is incident on the detector, it produces a signal that is optically or electrically isolated from that of the input signal. The HCPL-7720-520E is a logic output optoisolator which employs a GaAIAs infra-red LED coupled with a high speed CMOS open collector output detector.

Application Field

The HCPL-7720-520E optoisolator is primarily designed for use in isolating input signals from digital control systems and interfacing digital components where optical isolation is desired. It can be used to provide isolation for various types of digital signals ranging from low-speed to high-speed logic pulses and has a maximum logic density of 512 channels. It is also suitable for use in applications such as industrial control systems, data communications, medical instrumentation, automotive configuration systems, and integrated display systems.

Working Principle

The HCPL-7720-520E logic output optoisolator is based on the principle of Faraday cage isolation which consists of a thin sheet of metal surrounding an insulated conductor, forming a grounded shield that blocks the electrical field around the conductor. This type of isolation provides a high level of immunity to electrical noise and voltage spikes, ensuring that the signal transmits with minimal changes. The HCPL-7720-520E optoisolator uses an LED to provide optical isolation between the input and output signals. The LED emits a beam of infra-red light into the inside of the device which is detected by a high speed CMOS open collector output detector.

The detector is then used to control the transistor output of the HCPL-7720-520E optoisolator. The device can be used to provide logic level translations between systems with different logic families and different supply voltage levels. The device provides isolation rating between input and output of 2500VRMS/1 minute, and peak working voltage of 5A at 30V. It has low input currents and low output saturation voltages, and it can operate over a wide ambient temperature range.

The HCPL-7720-520E optoisolator is widely used in applications that require the transfer of a digital signal from one system to another in order to ensure that the signal will not be affected by electrical noise or voltage spikes. It is widely used in various industrial, medical, automotive, communication, and display systems that require reliable transmission of digital signals.

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