ACPL-5631L

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Optoisolators - Logic Output is a type of integrated circuit (IC) that uses a light-emitting diode (LED) coupled with a photoelectric or transistor combination to provide electrical isolation between two separate circuitry. Among these ICs, ACPL-5631L is a dedicated OCT (Optocoupler with Transistor Out) that offers solution for those applications requiring logic output or driving optocoupler directly for various output types. This article will discuss the application field and working principles of the ACPL5631L.

Application Field

The ACPL5631L is mainly used for various isolated logic applications, including the following:

• High-speed data transmission over isolated networks;
• Interfacing between two different logic families;
• Isolation between input/outputs of DAC (Digitalto-Analog Convertor) ICs;
• Isolation between Digital ICs and Power Electronics;
• Isolation of Digital Signal ICs from the environment;
• Interfacing between two logic systems in hostile environments;
• Transferring isolated information from a single input source to a plurality of output devices, for example;
• Safety and privacy applications;
• Mass data transmission systems.

The single- and dual-channel ACPL5631L is suitable for a wide range of applications requiring simple logic interface and isolated data transfer. For example, designers can build an optocoupler isolation system with the single-channel ACPL5631L by connecting the input side with the internal output side of the optocoupler. Theoutput logic levels for the single- and dual-channel ACPL5631Lare similiar.

Working Principle

As a logic output optocoupler, the ACPL5631L integrates a high power IR transmitter LED and a high speed, high-sensitivity photo detector IC. The ACPL5631L has a integrated transmitter LED and current-mode feedback photodetector IC, which makes the device structure compact and stability. The LED is mounted in a transparent 6-pin package, which helps improve optical transfer efficiency. The photo detector IC provides high-speed response time and includes a fast turn-on/turn-off gate driver that allows for fast switching.

The photo diode elements detect the intensity of the LED light and controls the different logic outputs. The ACPL-5631L has two differential outputs for single or dual channels, and the logic outputs can be selected by switching the photo detector’s output between active low (PNP) or active high (NPN) mode.

The basic working principle of the ACPL-5631L optocoupler is simple. The LED light emitted by the IC is detected by the photo diode, and the output transistors switch between high and low logic states. The high and low logic states of the ACPL-5631L can be either NPN transistors for active high logic or PNP transistors for active low logic. This logic state switching happens within a few nanoseconds, ensuring this optocoupler is suitable for high-speed applications.

Conclusion

In conclusion, the ACPL-5631L optoisolator is suitable for many isolated logic applications, such as high-speed data transmission, interfacing between two different logic families, optical isolation, safety and privacy applications, etc. With its integrated LED and photodiode structure, the ACPL-5631L makes it easy to provide electrical isolation between two separate circuties. The ACPL-5631L also ensures fast response time, making it suitable for use in high-speed applications.

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