This reference design is a GaN based 3-kW single-phase continuous conduction mode (CCM) totem-pole power factor correction (PFC) converter targeting maximum power density. The supply is designed to support a maximum input current of 16-A_RMS and peak power of 3.6 kW. The power stage is followed by a baby boost converter, which helps to greatly reduce the size of the bulk capacitor. The LMG3522 top-side cooled GaN device with integrated driver and protection, enables higher efficiency and reduces power supply size and complexity. The F28004x or F28002x C2000 controller is used for all the advanced controls including fast relay control, baby boost operation during AC drop out event, reverse current flow protection, and communication between the PFC and house-keeping controller. The PFC operates at a switching frequency of 65 kHz and achieves peak efficiency of 98.7%.

• > 180 W/in³ power density in an x-y dimension of less than 68-mm × 121-mm space and maximum height of 32 mm
• Peak efficiency of 98.7%
• Semiconductor relay increases power density and reliability
• GaN optimized with driver integration

• Merchant network and server PSU
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Board Side View

FET Daughter Card Top View

FET Daughter Card Bottom View With Heat Sinks

Board Top View

FET Daughter Card Bottom View

Totem Pole PFC Block Diagram