200kHz LLC Series Resonant Converter Reference Design With Low Standby Power Consumption


Design files


The PMP20795 reference design uses UCC256301 enhanced LLC controller with integrated driver to provide 24V/12A output from a nominal 380VDC input. UCC256301 provides hybrid hysteresis control (HHC) to enable a fast transient response. In this design, a 1st order system with over 6kHz bandwidth is achieved.  In addition, the advanced burst mode allows this converter to achieve less than 200mW power consumption at no load. With 200kHz nominal switching frequency, the converter is able to achieve over 96% peak efficiency.

  • 380VDC input to 24V/12A output
  • Board height less than 15mm
  • Less than 200mW standby power consumption
  • Over 96% peak efficiency
Output voltage options PMP20795.1
Vin (Min) (V) 300
Vin (Max) (V) 400
Vout (Nom) (V) 24
Iout (Max) (A) 12
Output Power (W) 288
Isolated/Non-Isolated Isolated
Input Type DC
Topology 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.

TIDUDI0.PDF (2370 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

TIDRSC7.ZIP (3739 K)

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

TIDCDR2.ZIP (2344 K)

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

UCC256301Wide vin LLC resonant controller with high-voltage start up enabling ultra-low standby power

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

= Top documentation selected by TI
No results found. Please clear your search and try again.
View all 2
Type Title Date
* Test report PMP20795 Test Results Aug. 21, 2017
Application note Designing With the Improved TL431LI (Rev. A) Jun. 28, 2019

Support & training

TI E2E™ forums with technical support from TI engineers

View all forum topics

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​