High Efficiency and Power Density 1kW Resonant Converter Reference Design with High Voltage GaN FET


Design files


The PMP20978 reference design is a high efficiency, high power density and light weight resonant converter reference design. It converts a 390V input to a 48V/1kW output. The PMP20978 power stage has over 140W/in^3 power density. The whole board weight is less than 230g. With fixed 950kHz switching frequency in steady state, 97.6% peak efficiency is achieved. 

  • 390V - 48V/1kW high frequency resonant converter
  • 950kHz resonant frequency with less than 210g weight
  • Utilizes TI's high voltage GaN FETs as input switches
  • Optimized LLC SR conduction with UCD7138/UCD3138A
  • Power stage dimension: 2" x 2.1" x 1.7"
  • Achieves peak 97.6% efficiency
Output voltage options PMP20978.1
Vin (Min) (V) 380
Vin (Max) (V) 400
Vout (Nom) (V) 48
Iout (Max) (A) 21
Output Power (W) 1008
Isolated/Non-Isolated Isolated
Input Type DC
Topology Half Bridge- Resonant
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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.

TIDUDX9.PDF (4484 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

TIDRU01A.ZIP (297 K)

Detailed overview of design layout for component placement

TIDRU07A.ZIP (8391 K)

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

TIDCE41A.ZIP (15182 K)

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

TIDRU04A.ZIP (1838 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

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Precision op amps (Vos<1mV)

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SR & load share controllers

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Technical documentation

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Type Title Date
* Test report PMP20978 Test Results Dec. 04, 2017

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