Low Profile Triple Output Isolated Fly-Buck Power Supply for Industrial Applications - Ref Design


Design files


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
Output voltage options PMP10558.1 PMP10558.2 PMP10558.3 PMP10558.4 PMP10558.5 PMP10558.6
Vin (Min) (V) 18 18 18 18 18 18
Vin (Max) (V) 30 30 30 30 30 30
Vout (Nom) (V) -5 12 -12 15 24 5
Iout (Max) (A) .1 .05 .05 .05 .025 .1
Output Power (W) .5 .6 .6 .75 .6 .5
Isolated/Non-Isolated Isolated Isolated Isolated Isolated Isolated Isolated
Input Type DC DC DC DC DC DC
Topology FlyBuck FlyBuck 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.

TIDU735.PDF (3475 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

TIDC869.ZIP (69 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 PMP10558 Test Results Jan. 13, 2015

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