Efficient Power Conversion (EPC) has released additional information on its EPC91123 evaluation board, a 6 kW isolated converter designed to convert 800 VDC to 12.5 VDC for next-generation AI data center power architectures.
As a contributor to the NVIDIA MGX™ AI Factory ecosystem, EPC is advancing gallium nitride (GaN)-based power conversion technologies intended to support emerging 800 VDC server architectures. The company’s solutions are designed to enable higher power density, improved efficiency, and scalable rack-level power delivery for future AI infrastructure.
The EPC91123 enables direct conversion to 12.5 V, eliminating the need for a traditional 48 V intermediate bus stage. According to EPC, this approach improves overall system efficiency by approximately 1–2%.
The converter is based on an input-series, output-parallel (ISOP) LLC topology and incorporates EPC’s Gen7 eGaN® devices, including the EPC2366, a 40 V device with 0.8 mΩ on-resistance in a compact 3.3 mm × 2.6 mm package, and the EPC2305, a 150 V device with 2.2 mΩ on-resistance.
The EPC91123 achieves a peak efficiency of 98.2% and a full-load efficiency of 97%. Designed for space-constrained AI server environments, the evaluation board delivers high power density within a compact 104 mm × 47 mm × 8 mm form factor.
“AI data centers consume tremendous amounts of power, making it critical to reduce power conversion stages to improve efficiency and power density, especially in 800 V architectures,” said Alejandro Pozo, Director of DC-DC System Engineering. “The ISOP topology is particularly well suited for high step-down-ratio power conversion, enabling improved transformer optimization and interleaved operation. It has been selected for our next 800VDC to 6VDC platform.”
The EPC91123 forms part of EPC’s broader strategy for 800 VDC AI power delivery systems. The company is developing conversion platforms spanning 800 VDC to 48 VDC, 12 VDC, and 6 VDC to address a range of system-level requirements in AI infrastructure.
By utilizing advanced GaN-based ISOP topologies and its latest Gen7 eGaN technology, EPC aims to provide scalable, high-density power conversion solutions that improve efficiency, reduce power distribution losses, and support next-generation accelerated computing platforms.
“NVIDIA MGX provides a modular foundation for scalable accelerated computing. A key element of NVIDIA’s strategy for AI infrastructure is the use of 800 VDC power architecture, helping address the growing demands for efficiency and power density as AI compute scales. We are pleased to contribute to the NVIDIA MGX AI Factory ecosystem with advanced multi-level GaN-based power conversion solutions designed to support emerging 800 VDC server architectures and next-generation AI infrastructure,” said Alex Lidow, CEO and Co-founder of EPC.
Additional information on the EPC91123 evaluation board, EPC’s Gen7 GaN technology, and the company’s portfolio of 800 VDC power conversion solutions for AI infrastructure is available from EPC.
Original – Efficient Power Conversion