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


Design files


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.
Output voltage options PMP10543.1 PMP10543.2 PMP10543.3 PMP10543.4
Vin (Min) (V) 20 20 20 20
Vin (Max) (V) 32 32 32 32
Vout (Nom) (V) -5 12 -12 5
Iout (Max) (A) .075 .075 .075 .075
Output Power (W) .375 .9 .9 .375
Isolated/Non-Isolated Isolated Isolated Isolated Isolated
Input Type DC DC DC DC
Topology FlyBuck FlyBuck FlyBuck FlyBuck
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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDU619.PDF (1129 K)

Test results for the reference design, including efficiency graphs, test prerequisites and more


Detailed schematic diagram for design layout and components


Complete listing of design components, reference designators, and manufacturers/part numbers


Files used for 3D models or 2D drawings of IC components

TIDC733.ZIP (72 K)

Design file that contains information on physical board layer of design PCB


PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

AC/DC & DC/DC converters (integrated FET)

LM50177.5-100V Wide Vin, 600mA Constant On-Time Synchronous Buck Regulator

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
Test report PMP10543 Test Results Oct. 24, 2014

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