85 -265V AC in, 24V/0.7A, 5V/0.25A AC/DC Open Frame Power Supply Reference Design
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This reference design is a quasi-resonant isolated flyback. The input voltage is the universal 85 - 265V AC range and two outputs provide 5V @ 250mA, from an LDO, and a regulated 24V @ 700mA, 2.5A peak for 30milliseconds, employing the UCC28600D Flyback controller.

  • Greater than 83% efficiency at full load (24V/0.7A; 5V/0.25A)
  • Wide Vin capability (85Vac to 265Vac)
  • Capable of 60W peak power for 30milliseconds on 24Vout
  • The FET switches ON mainly at the valley of the transformer's voltage thus improving Coss losses

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(Output Voltage 1)
(Output Voltage 2)
Vin (Min) (V)8585
Vin (Max) (V)265265
Vout (Nom) (V)245
Iout (Max) (A).7.25
Output Power (W)16.81.25
Input TypeACAC
TopologyFlyback- DCM
Flyback- Non Sync
Flyback- Quasi Resonant
Flyback- DCM
Flyback- Non Sync
Flyback- Quasi Resonant

TI Devices (2)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
TPS776  500-mA, 10-V, low-IQ, low-dropout voltage regulator with power good & enable  Power management  Sample & Buy Not Available
UCC28600  8-pin quasi resonant Flyback green mode controller  Offline & isolated DC/DC controllers & converters  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
TPS776 Download Download
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UCC28600 Download Download

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Technical documentation

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User guides (1)
Title Type Size (KB) Date
PDF 972 11 Apr 2014
Design files (3)
Title Type Size (KB) Date
ZIP 60 24 Nov 2014
PDF 23 11 Apr 2014
PDF 37 11 Apr 2014

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