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


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The PMP10543 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 constant 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
  • This 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 1110 24 Oct 2014 8
Design files (5)
Title Abstract Type Size (KB) Date Views
ZIP 72 24 Oct 2014 7
ZIP 329 24 Oct 2014 9
PDF 191 24 Oct 2014 1 1
PDF 212 24 Oct 2014 2
PDF 112 24 Oct 2014 13

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