Infineon launches a 27 kW three-phase PSU solution for next-generation AI server power architectures

AI workloads are redefining the power requirements of modern data centres. Continuous improvements in GPU performance and ever-increasing power density per rack are driving the industry’s evolution towards 800 VDC or ±400 VDC power supply architectures. To meet these demands, Infineon Technologies AG (FSE: IFX / OTCQX: IFNNY) has launched a 27 kW three-phase power supply unit (PSU) solution for server ODMs and OEMs. This reference design complies with the OCP ORV3 specification and AI server rack architecture requirements, further expanding Infineon’s comprehensive portfolio of AI server power supply solutions. The solution helps developers reduce time-to-market whilst enhancing rack power density, efficiency and thermal performance.

AI workloads are redefining the power requirements of modern data centres

The design integrates a range of Infineon devices, including 650 V CoolSiC and CoolMOS MOSFETs, EiceDRIVER gate drivers, XENSIV current sensors and PSoC microcontrollers. At an input voltage of 480 VAC and a 50 per cent load, this solution achieves a peak conversion efficiency of over 98 per cent. This reference design utilises a five-level ANPC PFC topology and a three-level LLC converter, achieving a power density of up to 116 W/in³, whilst the ORV3 minimum requirement is 94 W/in³. The integrated energy buffer provides a hold-up time of 20 milliseconds during transient grid disturbances. It also stabilises the line voltage during rapid changes in GPU load, eliminating the need for a separate capacitor backup unit (CBU). The integrated planar magnetic structure enables a compact, modular and scalable high-frequency transformer design.

Both the PFC and LLC stages are digitally controlled, enabling rapid response to the highly dynamic transients of AI loads. The Programmable Power Control Accelerator (PPCA), integrated into the PSOc Control C3 high-performance microcontroller family, supports precise current and voltage regulation and enables rapid response. This reference design supports a three-phase input voltage range of 311 to 528 VAC, making it suitable for a wide range of global grid standards. Across most of the load operating range, the design exhibits low total harmonic distortion of the input current (iTHD) and a power factor exceeding 0.99. The design operates within an ambient temperature range of –5 °C to 45 °C.