Power Integrations has introduced two ultra-slim auxiliary PSU reference designs intended for 800 VDC AI data centers, including systems built around NVIDIA’s Kyber liquid-cooled blade-rack architecture. The designs target the “control and housekeeping” rails that keep high-voltage power shelves and distribution electronics running, without consuming too much area or height on densely packed power distribution boards (PDBs).
The two flyback reference designs are rated at 15 W and 35 W. The 15 W version is a single-output design measuring 30 mm by 30 mm with a 7 mm profile. The 35 W version is an isolated, six-rail design measuring 80 mm by 60 mm with an 8 mm profile. Power Integrations puts both designs at at least 88% efficiency across line and load.
Both reference designs are based on Power Integrations’ InnoMux-2 ICs using 1700 V PowiGaN gallium-nitride (GaN) technology, described as a single-HEMT device. The company says the 1700 V-rated InnoMux-2 supports 1000 VDC nominal input voltage in a flyback configuration and can deliver flat efficiency of 90% in discontinuous conduction mode (DCM) while maximizing power delivery.
For data center power architects, the interesting part is mechanical: Power Integrations estimates these low-profile auxiliary supplies free up about 30% space on main PDBs, and it also estimates a roughly 30% reduction in BOM count. In an 800 VDC rack where bus hardware, sensing, and protection already fight for board area, an auxiliary supply that’s smaller and simpler can be just as valuable as a few points of efficiency—especially when it reduces component count in a spot that’s often replicated across multiple boards.
“The only alternative solutions are discrete, costly silicon carbide (SiC) devices which require 30 percent more components and space to operate,” said Jason Yan, Senior Training Manager at Power Integrations.
The downloadable design examples are DER-1110 (35 W, multi-output, using the IMX2353F) and DER-1114 (15 W, single-output, using the IMX2353F).
Source: Power Integrations
