AC/DC Auxiliary Supply Reference Design using UCC28700
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Key Document


The PMP10937 reference design uses Buck converter to convert universal AC input voltage  to a 18V/0.3A DC output with UCC28700 controller. Circuit simplicity is achieved with quasi-resonant valley-switching operation and the utilization of Buck topology. With all components placed within the dimension of 1.05" x 2.1", over 80% efficiency is achieved at full load and no load power consumption of this board is about 150mW.

  • Universal AC input with 18V/0.3A output
  • About 150mW no load power consumption
  • Over 80% efficiency is achieved at full load
  • Less than 40degC temperature rise
  • 1.05" x 2.1" X-Y dimension
  • Test report is available

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(Output Voltage 1)
Vin (Min) (V)85
Vin (Max) (V)265
Vout (Nom) (V)18
Iout (Max) (A).3
Output Power (W)5.4
Input TypeAC
TopologyBuck- Non Sync

TI Devices (1)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
UCC28700  Constant-voltage, constant-current PWM with PSR & Programmable cable compensation  Offline & isolated DC/DC controllers & converters  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
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Technical documentation

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User guides (1)
Title Type Size (KB) Date
PDF 1065 21 Dec 2015
Design files (3)
Title Type Size (KB) Date
PDF 77 21 Dec 2015
PDF 118 21 Dec 2015
PDF 111 21 Dec 2015

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