Infineon IRS27952STRPBF Resonant Controller IC for High-Efficiency SMPS Applications

The demand for higher efficiency, reduced electromagnetic interference (EMI), and improved power density in switched-mode power supplies (SMPS) continues to drive innovation in power electronics. The Infineon IRS27952STRPBF resonant controller IC stands out as a critical enabler for next-generation high-efficiency power supply designs, particularly in applications like server and telecom power systems, industrial power units, and high-end consumer electronics.

This controller is specifically engineered to implement a half-bridge resonant LLC converter topology, which is renowned for its ability to achieve high efficiency across a wide load range. Unlike traditional pulse-width modulation (PWM) controllers that operate with hard switching, the IRS27952 facilitates soft-switching operations (ZVS for the MOSFETs and ZCS for the rectifiers), drastically reducing switching losses and minimizing stress on the power components. This results in significantly higher efficiency, often exceeding 95%, and allows for higher switching frequencies, which in turn enables the use of smaller magnetics and capacitors for a more compact design.

A key feature of the IRS27952 is its fixed-frequency voltage-controlled oscillator (VCO) with a wide frequency range (from 50 kHz to 500 kHz). This approach provides several advantages over variable-frequency controllers, including simpler feedback loop compensation, predictable EMI spectrum, and easier filtering. The IC integrates a 600 V high-side driver with a bootstrap diode, simplifying the gate drive circuitry and enhancing system reliability. Furthermore, it includes comprehensive protection features such as integrated over-current protection (OCP), open-loop protection, and dead-time control, ensuring robust and safe operation under fault conditions.

The design process with the IRS27952 is streamlined by its minimal external component count. Designers can leverage Infineon's application notes and design tools to optimize the resonant network (Lr, Lm, Cr) for their specific input voltage, output power, and load requirements, achieving optimal performance with reduced time-to-market.

ICGOOFind：The Infineon IRS27952STRPBF is a highly integrated and robust resonant controller that simplifies the development of high-efficiency, high-density LLC resonant converters. Its fixed-frequency VCO control, high-voltage integration, and comprehensive protection suite make it an superior choice for advanced SMPS applications demanding peak performance and reliability.

Keywords：LLC Resonant Converter, Soft-Switching, High-Efficiency SMPS, Half-Bridge Controller, Fixed-Frequency Operation