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Constant-Voltage, Constant-Current Controller with Primary-Side Regulation for Bipolar Power Devices


Design kits & evaluation modules (1)

Name Part# Type
UCC28720EVM-212 5W Evaluation Module for USB off-line adapter UCC28720EVM-212 Evaluation Modules & Boards

Reference designs

85 to 265VAC Input 12V/3W Low Cost Flyback with BJT Reference Design

This 12V/3W reference design is optimized for very low cost and yet maintains good efficiency. Two key factors for minimizing cost are a BJT is used for the main power switch, and primary-side regulation (PSR) eliminates the need for an optocoupler. The UCC28720 quasi-resonant flyback controller is (...)

View the Important Notice for reference designs covering authorized use, intellectual property matters and disclaimers.

Software (2)

UCC28722 MathCad Design Tool (Rev. A)  (ZIP 2330 KB )    28 Mar 2014  
UCC28722 Excel Design Tool  (ZIP 44 KB )    05 Feb 2014  

WEBENCH® Designer UCC28720

 AC  DC  
AC Frequency  60 Hz  50 Hz
Use Isolated Output?
  Min   Max Range
VinRMS  V 85.00 to 480.00V
Vout  V 3.3 to 25V
Iout  A ≤ 10A
Ambient Temp  °C -40 to 125°C