This reference design is a digitally controlled, compact 1-kW AC/DC power supply design for server power supply unit (PSU) and telecom rectifier applications. This highly efficient design supports two main power stages, including a front-end continuous conduction mode (CCM) totem-pole bridgeless power factor correction (PFC) stage. The PFC stage features LMG341x GaN FET with integrated driver to provide enhanced efficiency across a wide load range and meet 80 plus titanium requirements. This reference design also supports LMG3422 GaN FET half-bridge inductor-inductor capacitor (LLC) isolated DC/DC stage to achieve +12-V DC output at 1 kW. Two control cards use C2000™ Piccolo™ microcontrollers to control both power stages.
特長
- 80 plus titanium efficiency,η=>95% at 20%-100% load
- CCM GaN-based totem pole bridgeless PFC stage with >98.8% peak efficiency, enabled by LMG341x GaN FET with integrated driver
- Half-bridge LMG342x GaN FET LLC stage with >98.3% peak efficiency
- Fast load transient, Vo change within 300-mV at 2.5-A/µs slew rate
- Low iTHD, <10% at 10% load, <5% at 20% load, <2% at >50% load
- Power density 41 W/in3, 38 mm x 66 mm x 160 mm
- Fast serial interface (FSI) based PFC or DC/DC communication