AUIRS2128S

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Power Management Integrated Circuit (PMIC) is a specialized integrated circuit used in the power management and energy management of electronic systems and devices. PMICs are used in various types of applications ranging from small portable systems to larger industrial systems, and are particularly important in the design of mobile and laptop computers. Gate Drivers are a type of Power Management Integrated Circuit that facilitate the operation of MOSFETs or IGBTs and allow them to be used in switching or power applications. AUIRS2128S is a MOSFET and IGBT Gate Driver developed by International Rectifier (IR).

1. Overview & Features of AUIRS2128S

The AUIRS2128S is a high-performance, low-cost flexible gate driver IC featuring integrated dual high-side and low-side MOSFET drivers, an adjustable dead time, a programmable input slew rate, 5V tolerant inputs (except UV/OVP which is limited to VCC + 0.3V), and a maximum operating frequency of 200KHz. The isolation voltage of the device is 1.0kV, with a typical peak output current of 200mA. Some of the features that make the AUIRS2128S ideal for industrial and automotive applications are its improved efficiency, extra protection circuitry, fast gate turn-off speed, excellent thermal performance, and an integrated protection circuit to guard against short circuits. The AUIRS2128S is available in an 8-pin DSO package, making it suitable for both through-hole and surface mount applications.

2. AUIRS2128S Application Field

The AUIRS2128S is designed to drive both MOSFETs and IGBTs in switching applications, such as motor control, motion control, and switch mode power supplies. It is also suitable for high-side and low-side switching in load switches, level shifting and buck/boost converter applications. The combination of fast turn-on/turn-off speeds and its excellent performance when switching large loads make the AUIRS2128S ideal for use in harsh industrial and automotive environments. In addition to these applications, the AUIRS2128S can be used in a variety of other applications such as:

• Vehicle traction systems
• Robotic motion control
• Soft-start circuits
• Inverters
• Solenoid/valve control
• AC/DC conversion
• DC motor control

3. AUIRS2128S Working Principle

The AUIRS2128S is a gate driver IC with 5V tolerant inputs, dual-channel high-side and low-side MOSFET/IGBT drives, an adjustable dead time and a programmable input slew rate. The device is capable of driving high current loads up to 200mA with a high frequency operation of up to 200KHz. The AUIRS2128S works on a basic three-step process, which is summarised below.

1. First, the AUIRS2128S receives a logic signal from the processor or MCU and propagates it to the high-side or low-side MOSFET or IGBT. When the logic signal is received, the high-side MOSFET or IGBT will turn-on or off, depending on the polarity of the signal.
2. The AUIRS2128S then uses its integrated protection circuits to prevent any phase-shifting between the logic signal and the actual turn-on/turn-off transitions of the MOSFET or IGBT. This protection circuit also guards against short-circuits, over-voltage and over-current faults.
3. The third step involves the turning-off sequence of the MOSFET or IGBT. The AUIRS2128S uses an adjustable dead time and a programmable input slew rate to ensure a fast and reliable turn-off of the power device.

The AUIRS2128S is thus able to drive large power devices in harsh applications with improved efficiency, reliability, and shorter switching times. Furthermore, the status of the drivers can be monitored using the Fault Status pins, which indicate the occurrence of faults, such as over-current, over-voltage, under-voltage and short-circuits.

4. Conclusion

The AUIRS2128S is a versatile and reliable MOSFET and IGBT Gate Driver released by IR. It is ideal for applications in the automotive and industrial markets, as it offers improved efficiency and reliable switching up to 200KHz. Furthermore, its UV/OVP protection, 5V tolerant inputs, adjustable dead time and programmable slew rate make the AUIRS2128S a powerful and versatile solution for motion control and switch mode power supplies.

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