Low Profile, Quad Output, Isolated Fly-Buck Power Supply for Industrial Applications


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The PMP10535 reference design is a low profile quad 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 four isolated outputs of ±5V, ±12V, 75mA 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 Fly-Buck 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 constan on-time control, no loop compensation is required, which simplifies the design and helps reducing the external part count and BOM cost.

  • Multiple isolated bias power using Fly-Buck, ideal for PLC and industrial applications
  • 2.5W output power, +/-12V, +/-5V @ 75mA each, with LM5017 capable of 7.5V to 100V input
  • Primary side regulation without opto; good cross regulation (within +/-5%)
  • 6mm low profile transformer
  • Constant on-time control; no loop compensation required and fast transient response
  • Circuit board is tested, and the design files and test report are included.

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Design Files

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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)-512-125
Iout (Max) (A).
Output Power (W).375.9.9.375

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 1025 20 Oct 2014 17
Design files (5)
Title Abstract Type Size (KB) Date Views
ZIP 72 20 Oct 2014 6
ZIP 634 20 Oct 2014 8
PDF 192 20 Oct 2014 4
PDF 212 20 Oct 2014 8
PDF 148 20 Oct 2014 32

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