Low Profile Quad Output Isolated Fly-Buck Power Supply for Industrial Application Reference Design


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The PMP9478 reference design is a low profile quad output isolated Flybuck power supply for industrial applications. The power supply has a synchronous buck regulator, LM5017, and a low profile (6mm) transformer. It generates four isolated outputs of ±5V, ±15V, 50mA each.  The LM5017 is a 100V wide Vin, 600mA synchronous buck regulator. The input voltage range of the design is 20V to 32V, making it suitable for 24V input industrial application. The Flybuck can regulate the secondary side outputs without opto-coupler or aux winding, and is capable of achieving good cross regulation within ±5%. With LM5017's Constant On-Time control, no loop compensation is required, which simplifies the design and helps reduce the external part count and BOM cost.

  • Multiple isolated bias power using Fly-Buck, ideal for PLC and industrial applications
  • 2W output power, +/-15V, +/-5V @ 50mA each, with LM5017 capable of 7.5V to 100V input
  • Primary Side Regulation without Opto, Good Cross Regulation, within +/-5%
  • Less than 6mm low profile transformer
  • Constant On Time Control, No Loop Compensation Required, and Fast Transient Response
  • This circuit board is tested, and the design files and test report are included

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Bill of Materials (BOM)

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(Output Voltage 1)
(Output Voltage 2)
(Output Voltage 3)
(Output Voltage 4)
Vin (Min) (V)20202020
Vin (Max) (V)32323232
Vout (Nom) (V)-515-155
Iout (Max) (A).
Output Power (W).

TI Devices (1)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LM5017  7.5-100V Wide Vin, 600mA Constant On-Time Synchronous Buck Regulator  Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
LM5017 Download Download
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Technical Documents

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User guides (1)
Title Abstract Type Size (KB) Date Views
PDF 585 28 Aug 2014 13
Design files (5)
Title Abstract Type Size (KB) Date Views
PDF 84 14 Oct 2014 4
ZIP 187 28 Aug 2014 7
ZIP 294 28 Aug 2014 6
PDF 475 28 Aug 2014 3
PDF 157 28 Aug 2014 14

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