AC Input, 5-V/1-A and 5-V/1-A dual-output flyback reference design
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Key Document


This design is auxiliary power supply with 5-V/1-A and 5-V/1-A dual output. The line and load regulation of the power supply is designed to be within 1% using the secondary side regulator, UCC28742. The system's reliability is improved through input UVLO and output OVP, OCP, SCP. The four point's load (25%, 50%,75%, 100%) average efficiency is above 81%. 

  • DCM valley-switching operation enable high efficiency at light load and better EMI performance
  • Up to 1% line and load regulation enable  output voltage high accuracy requirement
  • Average efficiency above 81% simplifies the thermal design

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(Output Voltage 1)
(Output Voltage 2)
Vin (Min) (V)8585
Vin (Max) (V)265265
Vout (Nom) (V)55
Iout (Max) (A)11
Output Power (W)55
Input TypeACAC
TopologyFlyback- DCMFlyback- DCM

TI Devices (2)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
ATL431  2.5V low-Iq adjustable precision shunt regulator  Voltage references  Sample & Buy View Design Kits & Evaluation Modules
UCC28742  High-Efficiency Flyback Controller With Optocoupler Feedback  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)
ATL431 Download Download
UCC28742 Download Download

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Technical Documents

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User guides (1)
Title Type Size (KB) Date
PDF 1004 14 Jan 2019
Design files (6)
Title Type Size (KB) Date
ZIP 432 14 Jan 2019
ZIP 26 14 Jan 2019
PDF 674 14 Jan 2019
PDF 83 14 Jan 2019
PDF 28 14 Jan 2019
PDF 144 14 Jan 2019

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