Test Report
45-W High-Power-Density Active Clamp Flyback With GaN Reference Design for Server Auxiliary Power
Description
This reference design is a GaN-based 45-W
active clamp flyback (ACF) providing auxiliary power in server and telecom power supply
units (PSU). The UCC28782 ACF controller and LMG2610 GaN half-bridge drive a planar
transformer with synchronous rectification using the UCC24612. This supply operates
using the PFC bus voltage as an input, and generates an isolated 12-V, 3.7-A output, and
a non-isolated 18-V, 400-mA output. The main 12-V output is protected by the TPS74800
ORing controller. Multiple PMP23146 units can be operated in parallel for higher power
capability.
Features
- High-frequency (400 kHz) GaN ACF design with planar transformer
- Compact size (30 mm × 35 mm × 12 mm) and high power density (60 W/in3)
- Parallel design is possible for higher power capability
- Low standby power consumption (< 100 mW)
- Additional non-isolated 18-V output provided
