3-kW phase-shifted full bridge with active clamp reference design with > 270-W/in3 power density


Design files


This reference design is a GaN-based 3-kW phase-shifted full bridge (PSFB) targeting maximum power density. The design has an active clamp to minimize voltage stress on the secondary synchronous rectifier MOSFETs enabling use of lower voltage-rating MOSFETs with better figure-of-merit (FoM). PMP23126 uses our 30mΩ GaN on the primary side and silicon MOSFETs on the secondary side. The LMG3522 top-side cooled GaN with integrated driver and protection enables higher efficiency by maintaining ZVS over a wider range of operation compared to Si MOSFET. The PSFB operates at 100 kHz and achieves a peak efficiency of 97.74%.

  • > 270-W/in3 power density in an x-y dimension of less than 68 mm x 102 mm and max height of 32 mm
  • Peak efficiency of 97.74%
  • Active clamp for minimizing voltage stress on SR MOSFETs enabling use of better FoM devices
  • GaN optimized with driver integration
Output voltage options PMP23126.1
Vin (Min) (V) 350
Vin (Max) (V) 410
Vout (Nom) (V) 12
Iout (Max) (A) 250
Output Power (W) 3000
Isolated/Non-Isolated Isolated
Input Type DC
Topology Full Bridge- Phase Shifted

A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDT275.PDF (844 K)

Test results for the reference design, including efficiency graphs, test prerequisites and more


Detailed schematic diagram for design layout and components


Complete listing of design components, reference designators, and manufacturers/part numbers

TIDMAE6.ZIP (10614 K)

Files used for 3D models or 2D drawings of IC components

TIDCG67.ZIP (7340 K)

Design file that contains information on physical board layer of design PCB

TIDMAE5.ZIP (7465 K)

PCB layer plot file used for generating PCB design layout


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Technical documentation

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Type Title Date
Test report 3-kW Phase-Shifted Full Brdg. W/ Active Clamp Ref Des W/ > 270 W/in3 Pwr Density PDF | HTML Apr. 20, 2022

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