Infineon IR1168STRPBF: A High-Performance Secondary-Side Controller for SMPS

In the realm of Switch-Mode Power Supplies (SMPS), achieving high efficiency, reliability, and precise control is paramount. The Infineon IR1168STRPBF stands out as a dedicated secondary-side controller IC engineered to meet these demanding requirements, particularly in resonant half-bridge (LLC) converter topologies. This component is a cornerstone for designers aiming to build advanced, high-performance power systems.

The primary role of the IR1168 is to accurately synchronously rectify (SR) the output voltage on the secondary side of an isolated power supply. By replacing conventional power-wasting Schottky diodes with low-RDS(on) MOSFETs, it drastically reduces conduction losses. This direct translation into higher system efficiency is its most significant advantage, enabling power supplies to meet stringent international energy regulations.

A key innovation of this controller is its ability to operate completely autonomously from the primary side. It self-generates all necessary drive signals for the SR MOSFETs based on the voltage sensed across their drain and source pins. This unique self-driven architecture simplifies the overall design, enhances reliability by eliminating the need for a noise-sensitive isolation barrier for control signals, and provides exceptional noise immunity.

The IR1168STRPBF is specifically optimized for high-frequency operation, making it an ideal choice for modern, compact power supplies where high power density is a critical design goal. It incorporates advanced protection features such as a precise minimum on-time blanking circuit to prevent false triggering and ensure stable operation under light-load conditions. Furthermore, its robust design includes negative voltage immunity, safeguarding the IC against voltage spikes and harsh switching noise commonly found in SMPS environments.

ICGOOODFIND: The Infineon IR1168STRPBF is an indispensable solution for engineers developing efficient and compact SMPS. Its autonomous, high-performance synchronous rectification capability significantly boosts efficiency, simplifies design, and enhances system reliability, solidifying its position as a top-tier secondary-side controller.

Keywords: Synchronous Rectification, High Efficiency, Secondary-Side Control, LLC Converter, Self-Driven