Infineon ICE3AR4780VJZ: An Advanced 800 V CoolMOS™ P7 with Integrated Quasi-Resonant Controller for High-Efficiency SMPS

The relentless pursuit of higher efficiency, increased power density, and enhanced reliability in Switch-Mode Power Supplies (SMPS) drives continuous innovation in power semiconductor technology. Addressing these demands, Infineon Technologies introduces the ICE3AR4780VJZ, a highly integrated system-in-package (SiP) that combines an 800 V CoolMOS™ P7 MOSFET with a quasi-resonant (QR) current-mode PWM controller. This solution is engineered to set a new benchmark for performance in off-line power applications.

At the heart of this device lies the latest generation CoolMOS™ P7 technology. This superjunction MOSFET is renowned for its exceptionally low specific on-resistance (RDS(on)), which directly translates to minimized conduction losses. Furthermore, the P7 technology showcases superior switching performance, characterized by reduced gate charge (Qg) and low effective output capacitance (Coss,eff). These attributes are critical for achieving high switching frequencies with minimal switching losses, a key factor in boosting overall power conversion efficiency.

The integrated controller is optimized to leverage the strengths of the CoolMOS™ P7. Operating in a quasi-resonant (QR) mode, the controller actively seeks to turn the MOSFET on at the valley of the drain-source voltage waveform. This valley-switching operation significantly reduces switching losses and electromagnetic interference (EMI) compared to conventional hard-switching topologies. The current-mode control ensures inherent cycle-by-cycle current limiting and excellent load transient response, enhancing the stability and robustness of the power supply.

Beyond its core functionality, the ICE3AR4780VJZ is packed with advanced features that simplify design and improve system-level performance. These include comprehensive protection functions such as overload protection (OLP), over-voltage protection (OVP), open-loop protection, and brown-out detection. The controller also incorporates a built-in frequency shuffling feature to spread EMI spectrum, easing compliance with stringent EMI regulations. Its high level of integration reduces the external component count, leading to a more compact bill of materials (BOM), a smaller PCB footprint, and increased cost-effectiveness.

Typical applications target mid-power SMPS designs, including adapters for notebooks, monitors, and gaming consoles, as well as auxiliary power supplies (AUX) for industrial systems and consumer electronics. The 800 V drain-source voltage rating provides a robust safety margin, ensuring reliable operation in harsh environments and under overvoltage conditions like lightning surges.

ICGOODFIND: The Infineon ICE3AR4780VJZ represents a significant leap forward in power supply integration. By marrying the state-of-the-art 800 V CoolMOS™ P7 with an intelligent quasi-resonant controller, it delivers a compelling solution that maximizes efficiency, reduces design complexity, and enhances system reliability for the next generation of high-performance SMPS.

Keywords: 800 V CoolMOS™ P7, Quasi-Resonant Controller, High-Efficiency SMPS, Valley-Switching, System-in-Package (SiP)