24V/12W Off-Line DCM Flyback Converter Optimized for Zero-Power at No-Load


Design files


This design features the UCC28730 flyback controller in conjunction with the UCC24650 Wake-Up monitor to provide CV, CC regulated output with ultra-low stand-by power that exceeds Level VI and CoC Tier 2 specifications for average efficiency and 10% load efficiency.  Wake-up signal detection provides fast transient response to large load steps.

As seen at APEC

  • No-Load Stand-By Power Consumption less than 5 mW (“Zero-Power”)
  • Wake-Up Detection for Fast Dynamic Response
  • Primary Side Regulation Eliminates Opto-Coupler
  • Average Efficiency and 10% efficiency exceeds Level VI and CoC Tier 2 specifications, effective 2016
  • Resonant Ring Valley Switching Operation for Highest Overall Efficiency
  • This circuit design includes tested data for efficiency and transient response along with key waveforms.
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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.

TIDU803.PDF (1067 K)

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

TIDRD28.PDF (29 K)

Detailed schematic diagram for design layout and components

TIDRD29.PDF (50 K)

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

TIDRD30.PDF (146 K)

Detailed overview of design layout for component placement

TIDC927.ZIP (200 K)

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

TIDRD31.PDF (284 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

AC/DC & DC/DC controllers (external FET)

UCC24650200-V wake-up monitor for fast transient primary-side regulation

Data sheet: PDF | HTML
AC/DC & DC/DC controllers (external FET)

UCC28730Zero standby PSR flyback controller with CVCC and wake-up monitoring

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
Technical article Power Tips: In the quest for no standby power, where do we declare victory? PDF | HTML May 30, 2015
Test report PMP10927 Test Results Feb. 25, 2015

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