SI8274AB1-IM1R

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Isolators - Gate Drivers

SI8274AB1-IM1R is an isolated gate driver IC manufactured by Silicon Labs. It is designed to accurately drive and control high power industrial applications, with a maximum allowable power rating of 2.5kV. The device operates with a wide range of input voltages, ranging from 5V to 20V, and is suitable for both high side and low side gate drive applications in industrial and automotive markets, including solar inverters, motor controllers, welders, and drives.

Application Field

SI8274AB1-IM1R is an ideal solution for high power applications requiring isolated gate drive as it is capable of providing up to 2.5kV of isolation. It is commonly used in:

• Solar inverters
• Motor controllers
• Welders
• Drives

The device is also well suited for use in applications with high common-mode transients, typically those related to the protective relay switching, as it provides an extra level of protection using internal diodes and ESD protection diodes.

Working Principle

SI8274AB1-IM1R uses a unique low impedance, high side and low side driver configuration that is capable of driving a load up to 500mA with low side capability up to 1.2A. The device features both short circuit protection and over temperature protection. This ensures the device’s robustness when operating under high power industrial conditions.

The low impedance ensures accurate and reliable switching of the load. In addition, the device features an internal high frequency controller that limits the EMI/RFI effects by controlling the rise and fall times. This ensures improved EMC performance of the device.

In addition to the low input current required by the low side driver to switch the load, the device also features a low power consumption stand-by mode. This ensures increased efficiency when the device is idle.

The SI8274AB1-IM1R is also capable of providing a fault handling mechanism through its open drain pin. When a short circuit occurs, the open drain pin will be pulled low, alerting the controller.

The device also features an internal protection network for preventing overvoltage and overcurrent transients. This ensures the device is protected from potential damage due to over voltage or overload conditions.

Conclusion

SI8274AB1-IM1R is a reliable and robust isolated gate driver IC manufactured by Silicon Labs. It is designed to accurately drive and control high power industrial applications. The device is well-suited for solar inverters, motor controllers, welders, and drives and is capable of providing up to 2.5kV of isolation. The device features internal short circuit protection, overcurrent protection, and EMI/RFI control. The low input current and low power consumption stand-by mode ensure increased efficiency and reliability.

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