93% Full-load efficiency (60% at 125mW), 310W industrial AC/DC reference design


Design files


This reference design is a compact and high efficient two-stage power supply. The front-end stage is a CCM power factor correction (PFC) based on UCC28180.The second stage is based on UCC256304, which drives a resonant 310 W LLC converter with two outputs, 19 V and 56 V. The board does not need any auxiliary supply and draws only 250 mW from mains (with PFC off), while supplying 150 mW load.

  • High-efficiency 310W isolated power supply with PFC and resonant LLC stages
  • Low no-load power consumption without using auxiliary supply
  • 93% full-load efficiency at 230-Vac input; it draws only 250mW while supplying 150 mW load
  • Compact board with integrated heat sinks
Output voltage options PMP30521.1 PMP30521.2 PMP30521.3
Vin (Min) (V) 90 350 350
Vin (Max) (V) 264 420 420
Vout (Nom) (V) 390 56 19
Iout (Max) (A) .85 3.75 5.26
Output Power (W) 331.5 210 99.94
Isolated/Non-Isolated Non-Isolated Isolated Isolated
Input Type AC DC DC
Topology PFC- Boost Half Bridge- LLC Half Bridge- LLC
Enterprise systems

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.

TIDT099.PDF (1969 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


Detailed overview of design layout for component placement

TIDRZF4.ZIP (3120 K)

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


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


PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

LLC controllers

UCC256304Wide vin LLC resonant controller with high-voltage start up enabling low standby power

Data sheet document-pdfAcrobat PDF open-in-new HTML
Power factor correction (PFC) controllers

UCC2818018-kHz-250-kHz CCM PFC controller with enhanced startup & transient response

Data sheet document-pdfAcrobat PDF open-in-new HTML
Shunt voltage references

LMV431A1%, low-voltage (1.24-V) adjustable precision shunt regulator

Data sheet document-pdfAcrobat PDF

Technical documentation

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Type Title Date
* Test report 93% Full-Load Efficiency (60% at 125 mW), 310-W Industrial AC/DC Ref Design Apr. 02, 2019

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