TIDT331 august   2023

 

  1.   1
  2.   Description
  3.   Features
  4.   Application
  5. 1Performance Specification
  6. 2Testing and Results
    1. 2.1 Efficiency Graph
    2. 2.2 Efficiency Data
    3. 2.3 Thermal Images
  7. 3Waveforms
    1. 3.1 Start-Up
    2. 3.2 Load Transients
    3. 3.3 Steady-State Waveforms

Description

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