100V-400Vdc Input, 15V/25mA Auxillary Supply Reference Design PMP10338 (ACTIVE)

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This reference design generates a non-isolated 15V/25mA output from a 100V-400V DC input. It is intended to be used as an auxillary bias supply in off-line applications.  It can be connected directly to the bulk input cap, after the bridge rectifier in most AC/DC system.  The UCC28910 with integrated 700V MOSFET controls a simple flyback converter power stage. The variable switching frequency control method and valley switching of the UCC28910 reduce losses.  This highly integrated design consumes very little board space and is comprised of only 13 components.

  • Auxillary bias power supply for AC/DC systems
  • Highly integrated design consumes only 0.42 square inches (2.6 square cm) of board space
  • High Efficiency - maintains over 50% efficiency with loads down to 5mA

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Schematic/Block Diagram

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Test Data

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Design Files

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(Output Voltage 1)
Vin (Min) (V)100
Vin (Max) (V)400
Vout (Nom) (V)15
Iout (Max) (A).025
Output Power (W).375
Input TypeDC
TopologyFlyback- DCM
Flyback- Integrated Switch

TI Devices (1)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
UCC28910  700V Flyback Switcher with Constant-Voltage Constant-Current and Primary-side Control  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)
UCC28910 Download Download

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Technical Documents

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User guides (1)
Title Type Size (KB) Date
PDF 1690 09 Sep 2014
Design files (4)
Title Type Size (KB) Date
PDF 124 09 Sep 2014
PDF 48 09 Sep 2014
PDF 80 09 Sep 2014
PDF 159 09 Sep 2014

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