SI8285BC-ISR

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Isolators - Gate Drivers is a type of technology which enables a connection between two systems, while keeping them electrically isolated. The SI8285BC-ISR is an application field which benefits from this technology, and working principle of the device.

What is SI8285BC-ISR?

The Silicon Laboratories SI8285BC-ISR ultra-high-side gate driver is an industrial grade gate driver designed to interface 3- to 32-V microcontrollers and logic signals with power devices up to 800 V. The device is 8.5 V rated and can operate in temperatures ranging from -40°C to +125°C. The device has an integrated quasi-resonant flyback controller to improve EMI performance. The high-voltage output voltage can be controlled from an external supply input, and the turn-off delay time is adjustable.

Benefits of SI8285BC-ISR

The SI8285BC-ISR has several advantages. It is designed to provide a galvanic isolation while transferring control signals to high-side power devices. It allows IC designers to offer integrated high-side gate drivers in isolated and non-isolated applications. It has a high-side current sensing capability with a wide sensing voltage range from 0.3 V to 15 V, which makes it an ideal choice for applications requiring a high-side current sense feature. It also has a fast, reliable output switch with a very low quiescent current of only 21 μA, which helps reduce power consumption in low-power applications.

Applications of SI8285BC-ISR

The SI8285BC-ISR has a broad range of applications. It is used in industrial applications, such as motor and pump controllers, solenoid drivers, energy management, and home and building automation systems. It is also used in applications requiring high-voltage isolation, such as automotive, industrial, and power supplies. The device is also ideal for harsh environmental applications, such as outdoor lighting, wireless lighting control, and agricultural applications.

Working Principle of SI8285BC-ISR

The SI8285BC-ISR uses four main components to provide high-side control, isolation, and current sensing. The driver is powered by the input voltage source, which can range from 3 V up to 32 V. The main input signal is sent from the microcontroller to the driver, which is then detected by the isolation amplifier. The isolation amplifier converts the signal into an isolated signal, which is then sent to the gate driver stage. The gate driver stage in turn controls the output circuit, which can range up to 800 V. The output circuit consists of a power MOSFET, which is then used to control the load. The device also includes an integrated high-side current sensing circuit which allows the user to monitor the load current.

Conclusion

The SI8285BC-ISR is an industrial grade gate driver designed for applications that require a high degree of isolation and control. By incorporating strong isolation capabilities and features such as current sensing and adjustable switch turn-off time, this device has a wide application range in industrial, automotive, power supplies, and harsh environmental applications.

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