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1-kW: 80+ titanium: GaN CCM totem pole bridgeless PFC and half-bridge LLC with LFU reference design

Texas Instruments

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. The 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. The design also supports a half-bridge LLC isolated DC/DC stage to achieve a +12-V DC output at 1-kW. Two control cards use C2000™ Piccolo™ microcontrollers to control both power stages.

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Features

80-plus titanium efficiency: η=>95% @ 20%-100% loadCCM GaN-based totem pole bridgeless PFC stage with >99% peak efficiency: enabled by LMG341x GaN FET with integrated driverHalf-bridge Si MOSFET LLC stage with >98% peak efficiencyFast load transient: Vo change within 300-mV @ 2.5-A/us slew rateLow iTHD: 50% loadPower density 41 W/in3: 38 mm by 66 mm by 160 mmFast serial interface (FSI) based PFC / DC/DC communication