800 VDC to AI Server Board Power Architecture: Designing 50 V, 12 V, and 6 V Intermediate Rails

Alex Lidow, CEO, Efficient Power Conversion
Alejandro Pozo, Director of Applications Engineering, Efficient Power Conversion
Ionel “Dan” Jitaru, CEO, Rompower Energy Systems

The industry shift toward 800 VDC power distribution for AI server racks requires novel DC-DC converter architectures to optimize delivery. Because of its superior efficiency and power density, the Input-Series-Output-Parallel (ISOP) topology [1,2] is rapidly becoming the standard. This paper analyzes three 800 V-input ISOP converters tailored for 50 V, 12 V, and 6 V nominal output rails. Implementing gallium nitride (GaN) transistors [3] on both the primary and secondary switching sides enables these converters to establish new performance benchmarks for peak and full-load efficiency at each critical voltage node.

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