SI8401AA-B-ISR

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Digital isolators are electronic devices used to electrically isolate two circuits. They operate using a variety of principles, though all share a common goal: to prevent the propagation of electrical noise between two systems which are electrically isolated from one another. Among them, the SI8401AA-B-ISR is an isolation power switch and incorporating extremely robust isolation rated to 3kV. This application note describes the application field and working principle of the SI8401AA-B-ISR.

The SI8401AA-B-ISR digital isolator is a unique type of power switch that uses analog circuitry to switch power between two isolated systems without the need for mechanical relays. It has an on/off input control in the form of either open-drain or open-collector outputs. This open-drain/ open-collector format facilitates the switch integration in different applications without the need for additional logic circuitry. Therefore, it offers an isolation-rated power switching solution suitable for many applications requiring an isolation power switch such as communication systems, instrumentation, medical and industrial automation.

In terms of working principle, the SI8401AA-B-ISR employs a hybrid type of switching technology which combines two different principles. These are an optocoupler for electrical isolation and circuit switching logic for control. It offers both linear and PWM (pulse width modulation) switching, depending on the signal type. Linear switching is used when the output connection requires a low capacitive load, while PWM switching is suitable for use with high capacitive loads.

The SI8401AA-B-ISR includes a separate power supply component. The device\'s power supply is a single 5V DC source, which is connected to the optocoupler and its logic circuit. The power supply provides energy to the optocoupler, enabling it to switch the circuit through its optocoupler. The voltage reference pin of the optocoupler must be connected to the power ground. This voltage level will be used as a reference for switching.

Moreover, the SI8401AA-B-ISR digital isolator offers fast switching speeds of up to 3MHz, which is suitable for many high-speed applications. It also offers a low on-resistance of 0.5Ω. This low resistance reduces power losses in the device, making it highly efficient and suitable for applications where power efficiency is important. Also, the isolator\'s wide input voltage range is compatible with both AC and DC input voltages. The wide input range makes the device suitable for a variety of applications, including automotive and industrial automation.

The SI8401AA-B-ISR digital isolator is an ideal solution for applications requiring electrical isolation and power switching. Its robust isolation rating up to 3kV ensures protection of sensitive circuits and prevents the propagation of electrical noise between two systems. Its open-drain/open-collector format allows the device to be integrated into a wide variety of applications, without the need for additional logic components. With its wide input voltage range and fast switching speeds, the SI8401AA-B-ISR makes a reliable and efficient solution for many applications.

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