Offline AC/DC 120W Multi-Output Flyback Power Supply Reference Design


Design files


The PMP4408 is a universal AC input, 120W flyback converter reference design. The LM5023 Quasi Resonant Flyback converter was chosen to get 2 high-efficiency isolated outputs. Additionally a downstream Buck converter, the TPS5402 enables 2 high-efficiency non-isolated outputs. The QR Flyback design implements Valley switching for high-efficiency and full protection features such as output short circuit and output overvoltage.

  • Good cross regulation
  • Valley switching for high efficiency
  • Output OVP, OCP and Short Circuit Protection
  • Input brown-out
  • Average efficiency is high
  • Size 92mm(L) x 95mm(W) x 30mm(H)
Output voltage options PMP4408.1 PMP4408.2 PMP4408.3 PMP4408.4
Vin (Min) (V) 176 20 20 176
Vin (Max) (V) 264 28 28 264
Vout (Nom) (V) 24 15 5 42
Iout (Max) (A) .6 .8 1.5 2
Output Power (W) 14.4 12 7.5 84
Isolated/Non-Isolated Isolated Non-Isolated Non-Isolated Isolated
Input Type AC DC DC AC
Topology Flyback- Quasi Resonant Buck- Non Sync Buck- Non Sync 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.

TIDU838.PDF (434 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

TIDC960.ZIP (101 K)

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


Includes TI products in the design and potential alternatives.

Buck converters (integrated switch)

TPS54023.5V to 28V Input, 1.7A Output, Non-Synchronous Step-Down Regulator with Integrated MOSFET

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 PMP4408 Test Results Mar. 10, 2015

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