IR21271S

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IR21271S is a monolithic high-performance gate driver IC. It provides 2 independent high and low side gate driver outputs and is specifically designed to drive power MOSFETs and IGBTs. This device is fully specified over the -40°C to +125°C operating junction temperature range, is available in 5-pin SOT23 or 8-pin SOIC package.

The features of IR21271S include fast turn-on rise time, enhanced IGBT turn-on blocking voltage, and adjustable peak current limit. It is designed to protect the power devices from over-current, under-voltage, short-circuit, over-temperature and other fault conditions. Furthermore, through the internal pull-up and pull-down resistors, it supports various operating modes for various applications.

The applications of IR21271S include solenoid, valve, motor Driver and LED driver. It is designed to drive power MOSFET and IGBT in synchronous buck, half-bridge, and full-bridge applications. It can be applied to motor drive, power supply, home appliance, AC motor drive, lighting control and other control circuits.

The working principle of IR21271S is based on an exponential current limiting concept. It continuously monitors the availability of power supply and dynamically adjusts the internal gate driver current to enable proper turn-on and turn-off operations. When an overload or over-current environment occurs, it automatically turns off the power supply and reduces the load to protect itself and the powered devices. It also features a built-in adjustable feedback circuit to adjust and monitor the load current. The feedback information is filtered, processed and compared before being sent to the gate driver.

In summary, IR21271S is a monolithic high-performance gate driver IC for various applications, such as solenoid, valve, motor driver and LED driver. It is designed to drive power MOSFET and IGBT in synchronous buck, half-bridge, and full-bridge applications. The working principle of IR21271S is based on an exponential current limiting concept, which continuously monitors the availability of power supply and dynamically adjusts the internal gate driver current.

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