SI8235AB-D-IS1R

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Isolators are devices that provide electrical insulation between two circuits that are at different potentials. The SI8235AB-D-IS1R is a high-speed gate driver isolator designed to ensure the reliable transmission of signal between the power mosfet gate/gate driver ICs and the control of a motor. In this article, we will discuss the application field and working principles of the SI8235AB-D-IS1R.

The SI8235AB-D-IS1R is a dual-channel gate driver, which provides two isolated channels between the gate/gate driver and the control ICs. The device is used in applications such as motor control and motion control systems, as well as in industrial, automotive, medical, and security applications. It provides two isolated channels with up to 500 mA peak load current for driving power MOSFETs. The device has a common mode transient immunity of 4000V/us and a cycle-by-cycle current sense limitation feature to protect against overload conditions.

The SI8235AB-D-IS1R is based on a bridge driver topology, in which four driver transistors are connected in a bridge formation. The device has two separate inputs, A and B, and two separate outputs, A and B. When the input levels of the A and B input are logic high or logic low, the 4 transistors are turned on and off accordingly, providing a high- impedance path between the outputs. This high impedance allows switching of the motor to be controlled, while preventing short circuiting of the power MOSFETs.

The device also has a few protection features, such as over-temperature shut-off protection, automatic stand-by mode operation, and dead time protection. In addition, the SI8235AB-D-IS1R provides a fast switching speed, with typical propagation delay time of 20ns. The device also has a cycling current limit feature, which protects against overload conditions.

In summary, the SI8235AB-D-IS1R is a gate driver isolator that is suitable for a wide range of motor control applications. The device offers high speed, high isolation and accurate protection features. The device is designed to ensure the reliable transmission of signal between the power mosfet gate/gate driver ICs and the control of a motor.

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