Infineon IRS21091STRPBF: High- and Low-Side Driver IC with Independent CMOS and LSTTL Inputs

In the realm of power electronics, the efficient and reliable control of MOSFETs and IGBTs in half-bridge configurations is paramount. The Infineon IRS21091STRPBF stands out as a specialized high-voltage gate driver IC engineered to master this challenge. This driver integrates independent high-side and low-side output channels with innovative input stages, making it a versatile and robust solution for a wide array of applications, from motor drives to switch-mode power supplies.

A defining feature of the IRS21091STRPBF is its independent CMOS and LSTTL input stages. This design offers exceptional flexibility for system designers. The inputs are compatible with a broad range of control signals, from LSTTL logic levels (common in older microcontrollers and logic circuits) to standard CMOS levels (ubiquitous in modern processors and FPGAs). This compatibility ensures easy interfacing with virtually any control logic without requiring additional level-shifting circuitry, thereby simplifying board design and reducing component count.

The core of the IRS21091's functionality lies in its high-voltage level-shifting technology. This allows the high-side driver section to operate correctly even when its output is swinging hundreds of volts above ground, which is typical in bridge circuits. The IC incorporates advanced dead-time control to prevent shoot-through currents, a catastrophic condition where both the high-side and low-side switches in a leg are conducting simultaneously. This built-in protection is crucial for enhancing system reliability and preventing device failure.

Furthermore, the driver boasts robust performance characteristics. It can deliver and sink peak output currents of up to 290mA and 600mA, respectively, enabling fast switching of power MOSFETs and IGBTs to minimize switching losses. The matched propagation delays between the two channels ensure precise timing, which is critical for maintaining the integrity of the output waveform. The device is also equipped with undervoltage lockout (UVLO) protection for both the high-side and low-side sections, safeguarding the power switches from operating in inefficient or dangerous conditions due to insufficient gate voltage.

ICGOODFIND Summary: The Infineon IRS21091STRPBF is a highly flexible and robust high-voltage gate driver IC. Its key strengths include independent CMOS/LSTTL input compatibility for easy interfacing, integrated dead-time control for enhanced safety, and high noise immunity,

Keywords: Gate Driver IC, Half-Bridge Driver, High-Voltage Level Shifting, CMOS and LSTTL Inputs, Dead-Time Control.