GaN/SiC PSU for Hyperscale AI Data Centers Achieves 97.8% Efficiency
A 12-kW power supply unit (PSU) “designed for production” reference design from Navitas Semiconductor targets hyperscale AI data centers with high-power rack densities of 120 kW and high-capacity EV charging systems. The PSU complies with Open Rack v3 (ORv3) specifications and Open Compute Project (OCP) guidelines.
The architecture combines Navitas’ Gen-3 Fast SiC MOSFETs, its novel “IntelliWeave” digital platform, and high-power GaNSafe ICs in three-phase interleaved TP-PFC and FB-LLC topologies. The IntelliWeave controller implements a hybrid control strategy that supports both critical conduction mode (CrCM) and continuous conduction mode (CCM), enabling it to deliver high efficiency under light-load to full-load conditions.
The platform’s three-phase interleaved totem-pole power factor correction (TP-PFC) is based on the company’s Gen-3 Fast SiC MOSFETs, which are fabricated using its “trench-assisted planar” technology.
Measuring 790 × 73.5 × 40 mm, the PSU has an input voltage range of 180 to 305 V AC and can deliver 10 to 12 kW at voltages up to 50 V DC. The unit implements active current sharing and overcurrent, overvoltage, undervoltage, and overtemperature protection. It also offers a hold-up time of 20 ms at 12 kW, and an inrush current of 3X times the steady-state current below 20 ms.
