is reference design is a GaN-based 3-kW phase-shifted full-bridge (PSFB) converter. This design uses an active clamp on the secondary side to minimize the voltage stress on the synchronous rectifier (SR) MOSFETs enabling the use of lower voltage rating MOSFETs that possess better figure-of-merit (FoM). PMP22951 uses 30-mΩ GaN on the primary side and 100-V, 1.8-mΩ GaN for the synchronous rectifiers. PSFB control is realized using TMS320F280049C real-time microcontroller. The PSFB converter operates at 140-kHz switching frequency and achieves a peak efficiency of 97.45% with 385-V input.
Features
- Peak efficiency of 97.45% at 385-V input
- Active clamp for minimizing voltage stress on SR MOSFETs enabling use of better FoM devices
- All GaN solution