5V/10W Off-Line DCM Flyback Converter Optimized for Zero-Power at No-Load - Reference Design


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.

  • No-Load Stand-By Power Consumption less than 5 mW
  • Wake-Up Detection for Fast Dynamic Response
  • Primary Side Regulation Eliminates Opto-Coupler
  • Average Efficiency > 83%; exceeds Level VI and CoC Tier 2 specifications, effective 2016
  • 10% efficiency > 80%
  • Resonant Ring Valley Switching Operation for Highest Overall Efficiency
Output voltage options PMP9561.1
Vin (Min) (V) 85
Vin (Max) (V) 265
Vout (Nom) (V) 5
Iout (Max) (A) 2
Output Power (W) 10
Isolated/Non-Isolated Isolated
Input Type AC
Topology Flyback- Quasi Resonant
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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.

TIDU788.PDF (1108 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

TIDC914.ZIP (256 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.

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

UCC24610Secondary side synchronous rectifier controller

Data sheet: PDF | HTML
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

CSD18534Q5A60-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 9.8 mOhm

Data sheet: PDF | HTML

Technical documentation

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View all 2
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 PMP9561 Test Results Feb. 16, 2015

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