350-V to 1000-V DC input, 56-W flyback isolated power supply reference design


Design files


This reference design provides isolated 14-V and 56-W outputs with a quasi-resonant flyback topology. The power supply can be powered from the 350-V to 1000-V DC input. This design uses cascode MOSFETs and flyback controller UCC28740-Q1. The line and load regulation are regulated to within ±1% precision. The peak efficiency is 84.6% at 1000-V input and 56-W output.

  • Wide input range: 350-V to 1000-V DC
  • High-precision output voltage
  • Peak efficiency 84.6% at 1000-V input and 56-W output
  • Quasi-resonant mode controller improves EMI performance
Output voltage options PMP41009.1
Vin (Min) (V) 350
Vin (Max) (V) 1000
Vout (Nom) (V) 14
Iout (Max) (A) 4
Output Power (W) 56
Isolated/Non-Isolated Isolated
Input Type DC
Topology Flyback- Quasi Resonant
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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.

TIDT266.PDF (1515 K)

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


Detailed schematic diagram for design layout and components


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


Detailed overview of design layout for component placement


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

TIDCG66.ZIP (386 K)

Design file that contains information on physical board layer of design PCB


PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Flyback controllers

UCC28740-Q1Automotive ultra low standby, flyback controller with integrated HV startup and optocoupler feedback

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
Test report 350-V to 1000-V DC Input, 56-W Flyback Isolated Power Supply Reference Design PDF | HTML Apr. 18, 2022

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