SI8261BCD-C-IMR

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Isolators, or galvanic isolators, provide isolated forms of electrical power while still allowing some form of interaction between separate circuits. In general, an isolator is an electronic device that utilizes electric energy between two distinct circuits without introducing any direct conductive physical connection. Isolators are used for a variety of purposes, such as controlling electrical signals so that they do not interact with each other; and for connecting electrical circuits in hazardous areas. Gate drivers are one type of isolators that have become increasingly important due to their ability to quickly power integrated circuits and other components with an isolated supply voltage. One of the most common gate drivers currently used is the SI8261BCD-C-IMR, and this article will examine its application field and working principle.

Application Field

The SI8261BCD-C-IMR has a wide range of application fields. In general, it is primarily used in brushless DC (BLDC) motor control applications, as it provides an isolated high-voltage, high-side driver, enabling improved efficiency and performance of such applications by providing isolation from the motor’s high-voltage power rails. By isolating the power rails, the motor will be able to operate with greater efficiency, as electrical signals from one circuit will not interfere with another. In addition, the SI8261BCD-C-IMR can also be used in many other applications, such as HVAC systems, general motor control, and automotive applications.

Working Principle

The SI8261BCD-C-IMR works by utilizing four IGBTs, which are three-terminal power semiconductor devices. The four IGBTs are arranged into two half-bridge channels, with the input signals being sent to each of the two half-bridges in order to enable them to operate independently. The two half-bridges are then connected to two separate power sources. The IGBTs are then used to isolate the power sources, thus providing greater isolation and reduced crosstalk between the two power sources. The device also features a built-in PROFET current sense circuit, which monitors both the On state and the Shut-off current of the IGBTs. The SI8261BCD-C-IMR also has an additional temperature compensation circuit, which ensures that the device operates safely at a much higher temperature range than other similar devices.

Conclusion

The SI8261BCD-C-IMR is a powerful gate driver that allows for the independent control of two separate power sources. It is an ideal choice for applications such as BLDC motor control and HVAC systems, and its built-in PROFET current sense and temperature compensation circuits ensure greater levels of safety and performance at higher temperatures. Isolators, such as the SI8261BCD-C-IMR, are becoming increasingly important in a variety of different applications, and their combination of performance and safety makes them the ideal choice for many applications.

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