99% Efficient 1kW GaN-based CCM Totem-pole Power Factor Correction (PFC) Converter Reference Design
Description
Continuous-Conduction-Mode (CCM) Totem-pole power factor correction (PFC) is a simple but efficient power converter. To achieve 99% efficiency: there are many design details that need to be taken into account. The PMP20873 reference design uses TI’s 600VGaN power stage: LMG3410: and TI’s UCD3138 digital controller. The design overview provides more details on the CCM Totem-Pole topology operation: gives the detail design considerations of the circuit: and provides magnetics and firmware control design considerations. This converter design operates at 100KHz. A soft start at AC line crossover minimizes current spike and lowers THD. The PFC Firmware measures AC current and PFC output voltage in real-time and predicts the dead time needed for the switch node to complete a full swing. The adaptive dead time control effectively minimizes both switching loss and GaN FET body diode conduction loss. A GUI is available to support parameter setting and control loop tuning.
Features
- 1kW: 99% efficiency at 100kHZ and 230V (Power derates to 600W for 115V long time operation)TI’s LMG3410 GaN power stage with an integrated driver ensures circuit reliability and eases designOCP: OTP and OVP with adjustable switching node dv/dt settingFull digital controlAdaptive deadtime control and low AC crossover current distortionGUI available for PFC parameter setting and control loop tuning
Applications
- Rack & server PSU with 48-V output
- Industrial AC-DC
- Standalone avionics PFC
- Radar
- Programmable DC power supply
- Linear motor power supply
- Server PSU with 12-V output
Product Categories
- Power management