85 to 265VAC Input 12V@3A High Efficiency Adapator Reference Design


Design files


This reference design provides an isolated 12V/36W output from a universal AC input range with over 89% peak efficiency. The UCC24610 synchronous rectifier controller and CSD19531Q5A FET reduce the rectifier loss and provide high efficiency with a minimal increase in cost. The UCC28740 flyback controller uses a combination of peak current modulation and frequency modulation to maintain excellent efficiency at lighter loads and minimize no load power consumption.  The current regulation feature of the UCC28740 provides accurate current limit protection. This compact design consumes a volume of only 2.0" x 2.0" x 0.75".

  • Compact AC/DC adaptor design (2.0" x 2.0" x 0.75")
  • Synchronous rectification for high efficiency (>89% peak, 88.7% average)
  • Accurate current limiting
  • Consumes less than 150mW power at no load to qualify for 4-star EC IPP Mobile device charger rating
  • Less than 150ms start-up time at full-load
Output voltage options PMP9715.1
Vin (Min) (V) 85
Vin (Max) (V) 265
Vout (Nom) (V) 12
Iout (Max) (A) 3
Output Power (W) 36
Isolated/Non-Isolated Isolated
Input Type AC
Topology Flyback- DCM^Flyback- Quasi Resonant^Flyback- Synchronous
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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.

TIDU688.PDF (4428 K)

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

TIDRC41.PDF (125 K)

Detailed schematic diagram for design layout and components

TIDRC42.PDF (84 K)

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

TIDRC43.PDF (66 K)

Detailed overview of design layout for component placement

TIDC809.ZIP (193 K)

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

TIDRC44.PDF (234 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Flyback controllers

UCC28740Constant-Voltage, Constant-Current (CVCC) Flyback controller with Secondary Side Regulation (SSR)

Data sheet: PDF | HTML
Linear & low-dropout (LDO) regulators

TPS71550mA 24V ultra-low-IQ low-dropout (LDO) voltage regulator

Data sheet: PDF | HTML
N-channel MOSFETs

CSD19531Q5A100-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 6.4 mOhm

Data sheet: PDF | HTML
SR & load share controllers

UCC24610Secondary side synchronous rectifier controller

Data sheet: PDF | HTML
Shunt voltage references

TL431Adjustable precision shunt regulator

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
Test report PMP9715 Test Results Dec. 10, 2014

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