High-Performance Secondary-Side Controller IC: Infineon IR11688STRPBF for SMPS

The relentless pursuit of higher efficiency, reliability, and power density in Switch-Mode Power Supplies (SMPS) has driven significant innovation in control IC technology. At the forefront of this evolution is the Infineon IR11688STRPBF, a highly advanced secondary-side controller designed to optimize performance in resonant half-bridge topologies.

Traditional power supply designs often rely on primary-side control (PSC), which can introduce limitations in regulation accuracy and dynamic response. The IR11688STRPBF addresses these challenges by implementing sophisticated control from the secondary side. Its core function is to precisely drive the SR MOSFETs (Synchronous Rectifiers), replacing power-wasting schottky diodes to drastically reduce conduction losses. This is critical for meeting modern energy efficiency standards like 80 PLUS Titanium.

A key strength of this IC is its ability to operate in resonant LLC converter configurations, which are prized for their high efficiency. The device intelligently monitors the voltage across the SR MOSFETs to determine the optimal turn-on and turn-off times, ensuring seamless and safe switching that is perfectly synchronized with the primary side. This advanced sensing technology eliminates the need for a current transformer or an auxiliary winding for synchronization, simplifying the overall design and reducing both component count and board space.

Furthermore, the IR11688STRPBF is engineered for robustness. It features very high noise immunity, which is essential for stable operation in electrically noisy power supply environments. Built-in protections include a dedicated VCC under-voltage lockout (UVLO) and a comprehensive suite of fault detection mechanisms, safeguarding the SR MOSFETs and the power supply itself from abnormal operating conditions.

The integration of these features into a single SO-8 package makes the IR11688STRPBF an exceptionally compact and powerful solution for designers aiming to push the boundaries of SMPS performance. It is ideally suited for applications such as AC-DC adapters, PC and server power supplies, and flat-panel TV power modules.

ICGOOFind: The Infineon IR11688STRPBF stands out as a pivotal component for next-generation power supplies, offering a blend of intelligent control, exceptional efficiency gains, and enhanced system reliability that is essential for modern high-performance electronics.

Keywords: Synchronous Rectification, Secondary-Side Control, LLC Resonant Converter, High Efficiency, SMPS