High and Wide AC Vin Quasi-Resonant Isolated Flyback Reference Design


Design files


PMP7991 is a quasi-resonant isolated flyback using the LM5023 controller IC. The design accepts an input voltage of 85VAC to 265VAC and provides a selectable output of 12Vout or 5Vout capable of supplying 2A of current to the load. The quasi-resonant switching scheme helps to reduce EMI.

  • Isolated flyback converter
  • Wide input range suitable for worldwide AC input condition
  • Output is switch selectable for 5V or 12V at 2A
  • Quasi-resonant switching for low EMI
Output voltage options PMP7991.1 PMP7991.2
Vin (Min) (V) 85 85
Vin (Max) (V) 265 265
Vout (Nom) (V) 5 12
Iout (Max) (A) 2 2
Output Power (W) 10 24
Isolated/Non-Isolated Isolated Isolated
Input Type AC AC
Topology Flyback- Quasi Resonant 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.

TIDUAU0.PDF (1180 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

TIDCB43.ZIP (271 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.

Shunt voltage references

LMV4311.5%, low-voltage (1.24-V) adjustable precision shunt regulator

Data sheet: PDF
Flyback controllers

LM5023AC-DC quasi-Resonant current mode PWM controller

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Test report PMP7991 Test Results Sep. 29, 2015

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