108VAC-305VAC Input, 3.6V/5mA Flyback Reference Design
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Key Document


This low power flyback supply is designed to minimize the total input current while supplying a low power 3.6V/5mA output.  The output is functionally isolated from the input, but not for safety.  The physical size is minimized by using the UCC28910 controller with integrated high-voltage MOSFET and primary-side regulation.

  • Less than 500µA input current for loads less than 4mA
  • Wide 108-305VAC input range
  • Small form factor (25mm x 18mm x 20mm)
  • Function isolation
  • Test report available

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Schematic/Block Diagram

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Design Guide

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Design Files

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(Output Voltage 1)
Vin (Min) (V)108
Vin (Max) (V)305
Vout (Nom) (V)3.6
Iout (Max) (A).005
Output Power (W).018
Input TypeAC
TopologyFlyback- DCM
Flyback- Integrated Switch
Flyback- Quasi Resonant

TI Devices (1)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
UCC28910  700V Flyback switcher with constant-voltage constant-current and primary-side control  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)
UCC28910 Download Download

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Technical documentation

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User guides (1)
Title Type Size (KB) Date
PDF 1025 16 Jul 2015
Design files (4)
Title Type Size (KB) Date
ZIP 159 16 Jul 2015
PDF 49 16 Jul 2015
PDF 79 16 Jul 2015
PDF 110 16 Jul 2015

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