85-265VACin, 5V/1.5A AC/DC USB Charger with Auto-Detect based on PSR Flyback with BJT Switch


Design files


This reference design provides an isolated 5V/1.5A output from a universal 85-265VAC input with an efficiency greater than 78%. Employing the UCC28722 Primary Side Regulation (PSR) Flyback controller which helps to eliminate the opto-coupler and secondary side regulation components, this design delivers additional cost savings by employing a bipolar power switch. Additionally, the design features the TPS2511 USB Dedicated Charging Port Controller and Current Limiting Power Switch to safely charge most smart phones and tablets. The energy saving features of the UCC28722 allow this design to consume less than 50mW when plugged into the wall with no device attached to the USB port.

  • Greater than 78% efficiency at full load (5V/1.5A)
  • Less than 50mW of stand-by power consumption under no load
  • Constant Current regulation feature of UCC28722 ensures output short-circuit protection
  • Auto detect feature of TPS2511 monitors USB Data line enabling charging of compliant USB devices
  • Programmable current limiting function of TPS2511 delivers additional layer of protection
  • Fast Start-up
Output voltage options PMP9594.1
Vin (Min) (V) 85
Vin (Max) (V) 265
Vout (Nom) (V) 5
Iout (Max) (A) 1.5
Output Power (W) 7.5
Isolated/Non-Isolated Isolated
Input Type AC
Topology Flyback- DCM^Flyback- Non Sync^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.

SLUUB09.PDF (2079 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

TIDRB78.PDF (59 K)

Detailed overview of design layout for component placement

TIDRB79.PDF (198 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Flyback controllers

UCC28722Low-Cost CVCC Flyback controller With primary-side regulation for bipolar Power Device

Data sheet: PDF | HTML
USB power switches & charging port controllers

TPS2511USB dedicated charging port controller and 2.2A power switch

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Test report PMP9594 Test Results Oct. 10, 2014

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