SI8235AB-D-IM1

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SI8235AB-D-IM1, a part of the Isolators - Gate Drivers family, is a product used to realize the communication between motor controllers and IGBTs, eliminating the need of optical insulation parts. It is comprised of a high speed isolated gate driver, that is suitable for both GTO and IGBT applications. This article will discuss the application field and working principle of SI8235AB-D-IM1.

The application fields for SI8235AB-D-IM1 are quite wide. It is suitable for IGBT, bidirectional GTO and other gate driving requirements. It is also widely used in high-speed, low current and high voltage applications, such as MedElec motors, medical imaging systems and so on. In addition, the expected input voltage for the average heavy power GTO is around 330V~400V, while SI8235AB-D-IM1 is applicable for up to 690V input voltage.

SI8235AB-D-IM1, consists of six integrated circuits that provide complete isolation for motor controllers and their connected GTO or IGBTs. The six integrated circuits consist of two half-bridge drivers, two output stages for the half-bridge and two input stages for the control signals. The main features of these integrated circuits are the isolated input/output, the high speed up to 1MHz, adjustable current limitation, and adjustable under voltage lockout.

The working principle of SI8235AB-D-IM1 is as follows: the input signals are applied to the isolated input inputs of the interface and are transmitted to two half-bridge driver ICs via the transformer. These two half-bridge driver ICs generate four high-speed isolated outputs that are then sent to two output stages for the half-bridge. These two output stages control the voltage of the main power devices, the GTO or IGBTs. Then the voltage of the main power devices changes, and the control signals are supplied to the two input stages in order to generate the output signals. In the end, the transformer separates the two sides, having both the IGBTs and motor controllers completely isolated from each other.

In conclusion, SI8235AB-D-IM1 is a part of the Isolators - Gate Drivers family and used mainly for motor controllers and IGBTs applications. It is characterized by a high speed of up to 1MHz, adjustable current limitation and adjustable under voltage lockout. Its working principle is that the input signals are isolated and sent to two half-bridge driver ICs, and these two half-bridge drivers generate four high-speed isolated outputs to two output stages for the half-bridge. Finally the transformer separates the two sides, having both the IGBTs and motor controllers completely isolated from each other.

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