Infineon BDP947H6327: High-Performance PFC and Quasi-Resonant Controller IC

In the pursuit of higher efficiency, reliability, and power density in modern switch-mode power supplies (SMPS), the integration of advanced control functions is paramount. The Infineon BDP947H6327 stands out as a highly integrated controller IC engineered to meet these demanding requirements by combining a critical Power Factor Correction (PFC) stage with a Quasi-Resonant (QR) flyback controller in a single package. This combination makes it an ideal solution for adapters, chargers, and auxiliary power supplies (AUX) rated up to 250 W.

The first core function of the BDP947H6327 is its transition mode (TM) PFC controller. This stage is crucial for aligning the input current waveform with the input voltage waveform, thereby achieving a near-unity power factor. This not only complies with stringent international energy regulations like ENERGY STAR and EU CoC V5 but also significantly reduces harmonic distortion and minimizes the reactive power burden on the AC mains. The controller's transition mode operation ensures that the boost inductor current is discharged to zero before the next switching cycle (Zero Current Switching - ZS), which maximizes efficiency at the PFC stage, especially at high mains voltages.

The second core function is its quasi-resonant flyback controller for the DC-DC conversion stage. Quasi-resonant operation is a significant advancement over conventional fixed-frequency PWM. It works by detecting the valley of the drain-source voltage (VDS) on the primary MOSFET, allowing the controller to turn on the switch at the point of minimum voltage. This Valley Switching technique drastically reduces switching losses and minimizes electromagnetic interference (EMI). The result is a substantial boost in overall system efficiency, particularly under light-load conditions, and allows for cooler, more compact designs.

A key strength of the BDP947H6327 is its high level of integration. By housing both controllers and all necessary logic on a single die, it simplifies circuit design, reduces the external component count, and enhances system reliability. The IC also incorporates a comprehensive suite of robust protection features, including:

Over-Voltage Protection (OVP)

Over-Current Protection (OCP)

Over-Temperature Protection (OTP)

Brown-In/Out Protection

These features safeguard the power supply and the end-load from fault conditions, ensuring long-term operational integrity.

ICGOODFIND: The Infineon BDP947H6327 is a superior, highly integrated controller solution that masterfully combines a high-efficiency Transition Mode PFC with a Quasi-Resonant flyback controller. Its valley switching technology for minimized switching losses, comprehensive protection suite, and high level of functional integration make it an exceptional choice for designers aiming to create compact, efficient, and reliable power supplies that meet modern global energy standards.

Keywords: Power Factor Correction (PFC), Quasi-Resonant Controller, Valley Switching, High Integration, Switch-Mode Power Supply (SMPS)