3W Non-ISO Bias Power Supply with up to 80% Efficiency, 15dB Margin EMI Performance Reference Design
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Key Document


TIDA-00940 is a 3-W, non-isolated bias power supply with up to 80% efficiency and excellent EMI performance, designed for motor control and drive subsystems in major appliances to save system costs, and other main benefits here. This reference design provides two non-isolated outputs with buck topology and is implemented using TI’s UCC28881 and TPS5405 controllers providing full protection. The hardware is designed and tested to pass EN-55014 Class B requirements for household appliances.

  • Non-isolated buck topology design saves system BOM cost with limited external components for AC/DC stage
  • Excellent EMI performance with 15 dB margin meets EN-55014 Class B requirements (conducted emission)
  • Provide reliable start-up for applications of high load capacitance
  • No external cooling needed.  Up to 85°C ambient operation
  • Support 700V self-powered start-up with no an auxiliary bias winding needed

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Schematic/Block Diagram

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Design Guide

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Design Files

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TI Devices (2)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
TPS5405  6.5V to 28V Input, 5V Fixed Output at 2A Step-Down Regulator with Intregrated MosFET  Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules
UCC28881  700-V Lowest Quiescent Current Off-Line Switcher  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)
TPS5405 Download
UCC28881 Download Download

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Technical Documents

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User guides (1)
Title Type Size (KB) Date
PDF 1868 10 Aug 2016
Design files (6)
Title Type Size (KB) Date
ZIP 454 16 May 2016
ZIP 62 16 May 2016
PDF 264 16 May 2016
PDF 49 16 May 2016
PDF 95 16 May 2016
PDF 186 16 May 2016

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