Universal AC Input, Dual Output (12V@30mA, 3.3V@400mA) Isolated Flyback Converter Reference Design
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Key Document


The PMP10143 reference design demonstrates the use of UCC28880 high-voltage switcher to design an Offline Isolated Flyback converter that can supply greater than 100mA output current. Using 2ndary side feedback control, the design delivers a tighly regulated 3.3V/400mA output that can be used to bias micontrollers and DSPs. In addition the design also provides a 2nd output rail of 12V/30mA that can be used to supply relays and other analog devices.

  • UCC28880-based Isolated Flyback converter
  • Design delivers >100mA output
  • Tightly regulated 3.3V output (<1%, at 25C) using 2ndary side opto-feedback
  • >74% efficiency at full-load on both rails
  • Flyback transformer designed for basic isolation
  • Short-circuit withstand capability of 3 seconds
  • This design is tested and includes test results and CAD files

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Schematic/Block Diagram

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Design Files

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(Output Voltage 1)
(Output Voltage 2)
Vin (Min) (V)9090
Vin (Max) (V)275275
Vout (Nom) (V)123.3
Iout (Max) (A).03.4
Output Power (W).361.32
Input TypeACAC
TopologyFlyback- Non SyncFlyback- Non Sync

TI Devices (2)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LMV431A  Low-Voltage (1.24V) Adjustable Precision Shunt Regulators  Voltage references  Sample & Buy Not Available
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)
LMV431A Download Download
Download Download
UCC28880 Download Download

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Technical Documents

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User guides (1)
Title Type Size (KB) Date
PDF 918 23 Sep 2015
Design files (4)
Title Type Size (KB) Date
ZIP 96 23 Sep 2015
PDF 208 23 Sep 2015
PDF 112 23 Sep 2015
PDF 253 23 Sep 2015

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