IRS21851STRPBF

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IRS21851STRPBF is a state-of-the-art gate driver from STMicroelectronics, designed for the applications of high voltage and current topologies. It is considered as a multi-function, output-polarity-switchable, 4A/35V gate driver with higher input thresholds. The device has two separate outputs, one is a pull-down output, and another one is a pull-up output.

The IRS21851STRPBF is mainly used in applications of high-voltage, high-current power conversion topologies. These include AC/DC converters, DC/DC converters, motor controls, 3-phase motor drives, solar inverters, etc. It can withstand voltage in the range of 0.25 V to 35 V, and can source/sink up up to 4 A. The device is highly reliable due to its output-polarity-switchable feature.

The working principle of the IRS21851STRPBF involves several stages, which are mainly a dual power-on reset circuit, opto-coupler control circuit, current limit circuit, and ENABLE circuit. The dual power-on reset circuit provides power-up reset for external control signals, enabling the device to withstand a high voltage and current environment. The opto-coupler control circuit is used to pass the PWM control signals from a standard controller to the gate driver, allowing it to switch on/off the device. The current limit circuit cuts off the gate drive to avoid overcurrent situation. Lastly, the ENABLE circuit is used to supply the gate driver voltage whenever it is enabled.

To summarize, IRS21851STRPBF gate driver is a reliable device used for powering high-speed, high-voltage, high-current topologies. It features a dual power-on reset circuit, opto-coupler control circuit, current limit circuit, and ENABLE circuit, to perform safely in adverse conditions. It comes in an 8-pin SOIC package and is widely used in power electronics applications like AC/DC converters, solar inverters, 3-phase motor drives, etc.

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