Low Profile Triple Output Isolated Fly-Buck Power Supply for Industrial Applications - Ref Design
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The PMP10558 reference design is a low profile triple output isolated Fly-Buck power supply for industrial applications.  The power supply has a synchronous buck regulator, LM5017, and a low profile (6mm) transformer.  It generates three isolated outputs depending on the transformer selection.  The LM5017 is a 100V wide Vin, 600mA synchronous buck regulator.  The input voltage range of the design is 18V to 30V, making it suitable for 24V input industrial applications.  The Fly-Buck can regulate the secondary side outputs without an opto-coupler or auxillary 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.

  • Vin: 18V to 42V
  • 4 layer board (1 oz. copper on top and bottom, 1/2 oz. on middle two layers)
  • Board dimensions: 3.2" x 1.6"
  • Good thermal performance and efficiency

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Design Files

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(Output Voltage 1)
(Output Voltage 2)
(Output Voltage 3)
(Output Voltage 4)
(Output Voltage 5)
(Output Voltage 6)
Vin (Min) (V)181818181818
Vin (Max) (V)303030303030
Vout (Nom) (V)-512-1215245
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  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)
LM5017 Download Download
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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 3534 13 Jan 2015
Design files (5)
Title Type Size (KB) Date
ZIP 338 13 Jan 2015
ZIP 69 13 Jan 2015
PDF 438 13 Jan 2015
PDF 243 13 Jan 2015
PDF 175 13 Jan 2015

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