9- to 60-VDC input, 12-V and 2-A output flyback reference design


Design files


This reference design is a wide input, 12-V and 2-A output isolated flyback converter using LM5155. The switching frequency is 250 kHz and the peak efficiency of the system is 89.19% at 24-V input. The load regulation in the input range is within ±0.5%. Peak-to-peak ripple of the output is within 296 mV under load transient from 1 A to 2 A with a slew rate of 1 A/us.

  • Wide input range
  • 250-kHz switching frequency
  • 89.19% peak efficiency
  • Load regulation within ±0.5% in whole input range
Output voltage options PMP40555.1
Vin (Min) (V) 9
Vin (Max) (V) 60
Vout (Nom) (V) 12
Iout (Max) (A) 2
Output Power (W) 24
Isolated/Non-Isolated Isolated
Input Type DC
Topology Flyback- CCM
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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.

TIDT145.PDF (2064 K)

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

TIDM275.PDF (182 K)

Detailed schematic diagram for design layout and components

TIDM276.PDF (98 K)

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

TIDM277.PDF (107 K)

Detailed overview of design layout for component placement

TIDM279.ZIP (660 K)

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

TIDCFO1.ZIP (1544 K)

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

TIDM278.PDF (552 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

AC/DC & DC/DC controllers (external FET)

LM51552.2-MHz wide VIN, 1.5-A MOSFET driver, non-synchronous boost controller

Data sheet: PDF | HTML
Shunt voltage references

TL431LIAdjustable precision shunt regulator with optimized reference current (pin layout: KRA)

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Test report 9~60-Vdc Input, 12-V/2-A Output Flyback Reference Design Oct. 17, 2019

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