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Explore power conversion solutions for next-generation server boards designed to operate directly from high-voltage DC in this 16-minute conference talk. Learn how escalating power consumption from modern GPUs and the need to cluster more GPUs per rack is driving rack power levels toward 1 MW and beyond, necessitating a fundamental architectural shift from the established 48V ecosystem to high-voltage DC systems operating at 800V or ±400V. Discover the new functions required for this transition, including eFuse technology for pre-charging server boards before connecting to the HV DC bus and discharging switches to eliminate hazardous voltages when removing server boards from IT racks. Examine power conversion strategies from HV DC down to GPU supply voltages below 1V, with detailed analysis of both 800V-to-50V and 800V-to-12V conversion as critical links to established low-voltage domains in current server boards. Review practical solutions with key performance indicators including power density metrics and measured efficiency data from designs operating at high switching frequencies near 1 MHz that leverage the full benefits of GaN HEMT technology.
