50/100-W Flyback reference design for audio applications


Design files


This reference design implements a dual-output flyback using the cost effective LM5021 AC-DC Current-Mode PWM Controller. Universal line input is converted to both 24-V and 6-V outputs. The TLV1117 Fixed LDO Voltage Regulator converts the 6-V output to 3.3 V and can handle 0.2 A of current. The supply is designed for sustained operation at 50 W and is rated for peaks up to 100 W, which is ideal for the power requirements of audio signals.

  • Universal line input to 24-V 2.25-A/4.5-A isolated output
  • Secondary output through an LDO outputs 3.3-V/200-mA with reduced noise
  • Up to 89% efficiency at full load without the need for a synchronous rectifier
  • Operates at 50 W of sustained power and 100 W peaks
Output voltage options PMP21516.1
Vin (Min) (V) 85
Vin (Max) (V) 264
Vout (Nom) (V) 24
Iout (Max) (A) 4.5
Output Power (W) 108
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.

TIDT086.PDF (3256 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


Includes TI products in the design and potential alternatives.

Flyback controllers

LM502130V, 1MHZ current mode PWM controller

Data sheet document-pdfAcrobat PDF open-in-new HTML
Linear & low-dropout (LDO) regulators

TLV1117800-mA, 15-V, linear voltage regulator

Data sheet document-pdfAcrobat PDF open-in-new HTML
Shunt voltage references

TL431Adjustable precision shunt regulator

Data sheet document-pdfAcrobat PDF open-in-new HTML

Technical documentation

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Type Title Date
* Test report 50/100-W Flyback reference design for audio applications Feb. 04, 2019

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