85 to 265 VAC input 5V/10W low cost flyback with BJT reference design


Design files


Constant Voltage/Constant Current  power supply generates 5V at 2A output. The design features primary side regulation (PSR) of a power transistor (BJT). With a low component count and low cost, the design can be use in USB type power supplies for PDA's, tablets, cameras and cell phones.

  • Primary Side Regulation (PSR)
  • ± 5% Voltage Regulation
  • ± 5% Current Regulation
  • Low Stand-by Power
  • Valley Switching
  • High Voltage Startup
  • Low Cost BJT control
Output voltage options PMP9135.1
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
?? View video with transcript Video

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.

TIDU222.PDF (600 K)

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

TIDC305.ZIP (859 K)

Detailed schematic diagram for design layout and components

TIDR403.PDF (30 K)

Detailed schematic diagram for design layout and components

TIDR404.PDF (22 K)

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

TIDU223.PDF (252 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)

UCC28720Constant-voltage, constant-current controller with primary-side regulation for bipolar power devices

Data sheet: PDF | HTML

Technical documentation

= Top documentation selected by TI
No results found. Please clear your search and try again.
View all 1
Type Title Date
* Test report PMP9135 Test Results Feb. 03, 2014

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. ​​​​​​​​