Universal Input to 12V@1A PSR Isolated Flyback with Integrated 700V Switch Reference Design
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Key Document


A quasi-resonant primary-side regulated isolated Flyback is used to provide 12V @ 1A from universal input voltage (90Vac to 264Vac). The converter does not employ any optocoupler and regulates the output voltage by sensing the auxiliary winding on primary side. A peak input voltage detector is used to sense input AC voltage, delivering 1/100 AC RMS equivalent voltage, with a +/-5% precision.

  • Simple isolated PSR Flyback converter with integrated 700V FET
  • Compact solution ("L" shaped PCB) supplies 12W with almost flat efficiency from 50mA to 1A load (75%...84%)
  • Opto-less topology increases the reliability of the power supply
  • Good output voltage regulation versus load: +/-5% in the whole temperature range

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(Output Voltage 1)
Vin (Min) (V)90
Vin (Max) (V)265
Vout (Nom) (V)12
Iout (Max) (A)1
Output Power (W)12
Input TypeAC
TopologyFlyback- Integrated Switch

TI Devices (2)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
TS321  Low-Power Single Operational Amplifier  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
UCC28911  700V Flyback switcher with constant-voltage constant-current and primary-side regulation  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)
TS321 Download Download
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UCC28911 Download Download

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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 1236 05 May 2016
Design files (6)
Title Type Size (KB) Date
ZIP 31 05 May 2016
ZIP 538 05 May 2016
PDF 547 05 May 2016
PDF 950 05 May 2016
PDF 128 05 May 2016
PDF 261 05 May 2016

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