93% Efficiency, 400-W AC/DC reference design for avionics


Design files


This is a compact, 30-V DC, 400-W reference design for avionics applications, accepting main frequencies between 400 Hz and 800 Hz. This design consists of a front-end, two-phase interleaved transition mode (TM) power factor correction (PFC) based on UCC28064A. This minimizes the PFC inductor size and reduces EMI filter requirements. The DC/DC is implemented by employing HB-LLC stage, using UCC256404. For efficiency improvement, synchronous rectification is used at secondary side with FETs driven by UCC24612.

  • Overall efficiency of 92.5% at full load with peak efficiency > 93%
  • High power factor > 0.99, meets PFC regulations and current THD for DO-160 avionics requirements
  • ZCS avoidance feature and OVP sensing feature in LLC controller improves robustness and protects systems from overcurrent, short circuit and overvoltage to ensure safety
  • Small PCB form factor of 160 mm by 80 mm by 30 mm
Output voltage options PMP30763.1 PMP30763.2
Vin (Min) (V) 96 200
Vin (Max) (V) 134 260
Vout (Nom) (V) 240 30
Iout (Max) (A) 1.8 13.3
Output Power (W) 432 399
Isolated/Non-Isolated Non-Isolated Isolated
Input Type AC DC
Topology PFC- Multiphase Half Bridge- LLC
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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.

TIDT169.PDF (4922 K)

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

TIDM517A.PDF (626 K)

Detailed schematic diagram for design layout and components

TIDM518A.PDF (136 K)

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

TIDM519.PDF (370 K)

Detailed overview of design layout for component placement

TIDM521.ZIP (3324 K)

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


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

TIDM520.PDF (1598 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

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Technical documentation

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Type Title Date
* Test report 93% Efficiency, 400-W AC/DC Reference Design for Avionics Mar. 27, 2020

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