250-W single-stage LLC converter with multiple outputs reference design


Design files


This is a single-stage reference design converting AC input voltage 85-115-V AC to three isolated outputs - 12 V/7.5 A, 60 V/2.5 A, 25 V/0.4 A with one non-isolated output 21 V/0.15 A using the UCC256304 resonant controller. The design is for industrial applications and the bill of materials (BOM) cost is highly optimized with the single-stage structure and the use of the resonant controller. The high voltage startup, integrated driver and burst operation of UCC256304 allows minimum use of discrete components and eliminates the need for an auxiliary supply.

  • Single-stage AC/DC solution with 85-115-V AC input range eliminates the need of front-end PFC
  • Generates multiple output voltages applicable to different applications
  • Weighted feedback enables tight-cross regulation for 60-V and 12-V DC outputs
  • Low profile design with maximum board height of 35 mm
  • Provides efficient power conversion with greater than 92% peak efficiency
Output voltage options PMP40482.1 PMP40482.2 PMP40482.3 PMP40482.4
Vin (Min) (V) 85 85 85 85
Vin (Max) (V) 115 115 115 115
Vout (Nom) (V) 12 60 25 21
Iout (Max) (A) 7.5 2.5 .4 .15
Output Power (W) 90 150 10 3.15
Isolated/Non-Isolated Isolated Isolated Isolated Non-Isolated
Input Type AC AC AC AC
Topology Half Bridge- LLC Half Bridge- LLC Half Bridge- LLC Half Bridge- LLC

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.

TIDT102.PDF (1156 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

TIDRZJ5.ZIP (1875 K)

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

TIDCFF4.ZIP (1243 K)

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

TIDRZJ4.PDF (1403 K)

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
Shunt voltage references

TL431Adjustable precision shunt regulator

Data sheet document-pdfAcrobat PDF open-in-new HTML

Technical documentation

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Type Title Date
* Test report 250-W Single-Stage LLC Converter With Multiple Outputs Reference Design Apr. 12, 2019

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