AC/DC Buck Converter Reference Design with Low Line Input and 12V/25mA Output
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Key Document


The PMP20654 reference design uses Buck converter to convert low line AC input voltage (85Vac to 140Vac) to a 12V/25mA DC output with UCC28880 FET integrated controller. This design passes class B conducted emission test without adding any EMI filter before rectifier.

  • 85VAC - 140VAC to 12V/25mA
  • Single-layer PCB
  • Pass Class B conducted emission test
  • Less than 10°C temperature rise at toom temperature

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Schematic/Block Diagram

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Design Files

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(Output Voltage 1)
Vin (Min) (V)85
Vin (Max) (V)140
Vout (Nom) (V)12
Iout (Max) (A).025
Output Power (W).3
Input TypeAC
TopologyBuck- Non Sync

TI Devices (1)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
UCC28880  High Voltage Switcher for Non-isolated AC/DC Conversion  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)
UCC28880 Download Download

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Technical Documents

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User guides (1)
Title Type Size (KB) Date
PDF 1556 08 Dec 2017
Design files (6)
Title Type Size (KB) Date
ZIP 1344 08 Dec 2017
ZIP 343 08 Dec 2017
PDF 249 08 Dec 2017
PDF 52 08 Dec 2017
PDF 25 08 Dec 2017
PDF 79 08 Dec 2017

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