SI8284BC-IS

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Isolators are an important type of device used to ensure safety in circuits, as they act as an electrical break between two parts of a circuit. They isolate an input signal from an output signal so that a fault in one part of the system does not affect the other. One such isolator is the SI8284BC-IS, which is a gate driver isolator for motor and general-purpose applications.

The SI8284BC-IS is a single-channel, galvanically isolated, non-inverting gate driver IC for use with brushless DC, stepper, and dc brushed motors, as well as other general-purpose applications. It includes an integrated low-side MOSFET, a driver IC, and a high-side power switch. It offers series and parallel configuration capabilities with an adjustable output current range of up to 6A, and is designed to minimize EMI without adding an additional shielding layer.

The device is a non-inverting gate driver symbol, meaning it uses two high-side and low-side MOSFET switches. The driver IC is powered by a 10 VDC voltage source from the motor power and is in turn connected to the motor gate at a typical voltage of 3.3 VDC. The SI8284BC-IS uses an on-chip loop-back feedback circuit to sense the gate voltage. This allows it to compensate for the temperature effects and other influences on the MOSFET switch performance.

Its circuit design incorporates integrated high- and low-side MOSFET switches, with an adjustable output current range of up to 6A. This ensures efficient current control, resulting in higher efficiency and lower power consumption compared to standard motor controllers. In addition, the device offers enhanced EMI immunity and in-system transient protection.

To ensure safe operations, the device is designed with an over-temperature protection (OTP) circuit. This monitors the temperature of the MOSFET switch and the driver IC, providing an alarm signal to the system when the temperature exceeds an adjustable threshold. Additionally, the device is designed with a proprietary back-EMF circuitry, which minimizes EMI generation within the motor and reduces the noise emissions from the motor.

The SI8284BC-IS is a perfect solution for general-purpose and motor applications, offering enhanced performance, protection, and superior functionality. It is designed to be the highest power density and reliable galvonic isolator currently available in the marketplace. The ease of integrating the device into a system makes it a suitable choice for use in low-voltage applications.

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