SI8261ACD-C-IS

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The SI8261ACD-C-IS isolator gate driver is a monolithic half-bridge driver that can be used in a wide variety of applications requiring isolation between the high side and low side of the gate drive circuit. The device is suitable for high-speed switching applications such as IGBTs, MOSFETs, power relays, and solenoids.

The main application field of the SI8261ACD-C-IS is in power electronics, particularly in automotive, industrial, and consumer applications. The device provides reliable isolation and signal interface between different power conversion stages, enabling safe data transfer across isolated channels. It features a wide operating voltage range (2.5V to 5.5V) with low power consumption (5µA at 5V) and provides a maximum drive current of 0.5A for synchronous switching of IGBTs, MOSFETs, relays, and solenoids.

The SI8261ACD-C-IS includes a built-in charge pump and boot-strap circuitry that allows it to operate from a single supply voltage, eliminating the need for dual supplies. This single-supply operation eliminates the need for matched supplies or additional external components typically used in isolated gate drivers. The device is also protected against output overload, high transients, and reverse polarity.

The working principle of the SI8261ACD-C-IS is based on optical isolation, which isolates the high side and low side of the gate drive circuit through an optical transmission channel. It uses a 600v input-to-output isolation barrier to ensure signal transmission accuracy and maintain a safe voltage isolation between the two parts. It utilizes a series of optical transmitters and receivers to ensure no communication errors.

At the core of the SI8261ACD-C-IS is a charge pump circuit, which is a feedback circuit that keeps the output voltage from fluctuating during operation. The charge pump circuit takes input from the input channel and uses it to adjust the output voltage to match the requirements of the application, eliminating the need for multiple supplies. The circuit also includes an isolation transformer, which allows the device to drive high-side and low-side logic elements without sharing a common electrical ground.

The SI8261ACD-C-IS is an excellent gate driver for a wide range of applications and is ideal for high-speed switching operations. Its optical isolation capability makes it suitable for use in high-voltage environments, while its robust construction and integrated safety features make it a reliable and safe device for any type of isolated system.

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