Isolated Non-synchronous Flyback Converts Universal Vin to 18V@550mA Reference Design


Design files


The LM5021-2 is an off-line controller that can work in CCM and DCM. A pulse skip mode improves the efficiency of this isolated flyback, and flattens the curve at most loads. It is also suitable for power line communication PSU.

  • Ability for the power supply to work in both CCM and DCM mode
  • Wide Vin capability (90 to 275V AC)
  • Duty cycle restriction to 80%
  • 84% full load efficiency and over a wide range of load
  • Gives the user the flexibility to do external slope compensation with LM5021-2
Output voltage options PMP8586.1
Vin (Min) (V) 90
Vin (Max) (V) 275
Vout (Nom) (V) 18
Iout (Max) (A) .55
Output Power (W) 9.9
Isolated/Non-Isolated Isolated
Input Type AC
Topology Flyback- Non Sync

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.

SNVU426.PDF (806 K)

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

SNVR438.PDF (62 K)

Detailed schematic diagram for design layout and components

SNVR439.PDF (23 K)

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

SNVC161.ZIP (103 K)

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


Includes TI products in the design and potential alternatives.

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Technical documentation

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Type Title Date
Test report PMP8586 Test Results Apr. 16, 2014

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