Infineon IR11682STRPBF: A High-Performance DCM and CCM Control IC for SMPS
In the realm of Switch-Mode Power Supplies (SMPS), achieving high efficiency, robust performance, and reliable operation across various load conditions is paramount. The Infineon IR11682STRPBF stands out as a dedicated control IC engineered specifically for synchronous rectification (SR) in both Discontinuous Conduction Mode (DCM) and Continuous Conduction Mode (CCM), addressing the critical need for enhanced power conversion efficiency in modern AC-DC adapters, chargers, and server power supplies.
The primary role of the IR11682STRPBF is to drive an external MOSFET, which replaces a conventional output rectifier diode. This substitution is crucial because the low on-resistance (RDS(on)) of a MOSFET drastically reduces conduction losses that are typically associated with diode rectifiers. By minimizing these losses, the IC enables power supplies to achieve significantly higher overall system efficiency, often by several percentage points, which is essential for meeting stringent international energy regulations.
A key strength of this controller is its advanced sensing and control algorithm. It intelligently monitors the voltage across the SR MOSFET's drain and source to precisely determine the optimal turn-on and turn-off instances. This ensures the MOSFET is only active when it needs to conduct current, preventing problematic scenarios like cross-conduction with the primary-side switch and reverse current flow. Its ability to operate seamlessly in both DCM and CCM, including the challenging Quasi-Resonant (QR) mode, makes it exceptionally versatile for a wide range of SMPS topologies like flyback and LLC resonant converters.
Furthermore, the device incorporates robust protection features that safeguard the system. These include a programmable minimum gate pulse width to avoid spurious triggering and a negative voltage clamp on the sense pin to protect against voltage spikes and noise in harsh switching environments. Housed in a compact PPAK 5x6 package, the IR11682STRPBF offers a high level of integration in a small form factor, simplifying board design and saving valuable space.
The Infineon IR11682STRPBF is an indispensable solution for designers aiming to push the efficiency boundaries of their power supplies. Its sophisticated control logic for synchronous rectification across multiple operating modes, combined with robust integrated protection, makes it a top-tier choice for creating compact, reliable, and high-efficiency SMPS designs for the next generation of electronics.
Keywords: Synchronous Rectification, DCM and CCM Operation, High Efficiency, SMPS Control, MOSFET Driver
