AC Input, 5V/3.3V2A Cascaded Power Supply Reference Design


Design files


The PMP4472 is a power reference design with a high AC input, 5Vout, followed by a DC isolated
output of 3.3V at 2A. It implements a high efficiency controller UCC28740 to provide 5V bus voltage and a step-Down Converter TPS54228.The design achieves good line and load regulation as well as  good dynamic response and low output ripple voltage.

  • Isolated Flyback and Buck converter
  • 2 outputs include 5V Bus voltage
  • Good line and load regulation
  • Good dynamic response
  • Low output ripple voltage
Output voltage options PMP4472.1 PMP4472.2
Vin (Min) (V) 198 5
Vin (Max) (V) 242 5
Vout (Nom) (V) 5 3.3
Iout (Max) (A) 1.5 2
Output Power (W) 7.5 6.6
Isolated/Non-Isolated Isolated Non-Isolated
Input Type AC DC
Topology Flyback- Quasi Resonant Buck- Synchronous
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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.


Test results for the reference design, including efficiency graphs, test prerequisites and more

TIDRH50.PDF (358 K)

Detailed schematic diagram for design layout and components

TIDRH51.PDF (168 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDRH52.ZIP (198 K)

Files used for 3D models or 2D drawings of IC components


Includes TI products in the design and potential alternatives.

Flyback controllers

UCC28740Constant-Voltage, Constant-Current (CVCC) Flyback controller with Secondary Side Regulation (SSR)

Data sheet: PDF | HTML
Buck converters (integrated switch)

TPS542284.5V to 18V Input, 2-A Synchronous Step-Down Converter with Eco-mode™

Data sheet: PDF | HTML
Shunt voltage references

TL431Adjustable precision shunt regulator

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Test report PMP4472 Test Results Sep. 22, 2015

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