2.5W Bipolar Isolated Fly-Buck™ Ultra-Compact Reference Design


Design files


PMP15006 is a miniature (15 mm X 15 mm) Fly-Buck™ reference design using the LM5017.  The primary and secondary outputs are set at +/-5V nominal. This ultra-compact design accommodates an input voltage range from 18V to 30V, and a nominal input voltage of 24V. The primary side is set at 5.3V using feedback resistors and the secondary isolated side will supply -5V. The transformer used is a 33 uH,  LPD8035V coupled inductor from Coilcraft, with a turns-ratio of 1:1 and a maximum operating current on both the primary and secondary rails set at 250 mA each.  The switching frequency is set at 475 kHz.

  • 18V to 30Vin, 5V @250 mA (dual) output, 2.5W (one non-isolated primary and one isolated secondary)
  • ~82% peak efficiency
  • Compact and cost effective isolated solution with an off-the-shelf coupled inductor instead of a custom transformer
  • Board size: 15 x 15 mm; max component height: 3.5 mm
  • 3.5 mm max height of coupled inductor helps in height-constraint applications
Output voltage options PMP15006.1 PMP15006.2
Vin (Min) (V) 18 18
Vin (Max) (V) 30 30
Vout (Nom) (V) 5 -5
Iout (Max) (A) .25 .25
Output Power (W) 1.25 1.25
Isolated/Non-Isolated Non-Isolated Isolated
Input Type DC DC
Topology FlyBuck FlyBuck

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.

TIDUCA3.PDF (1698 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


Detailed overview of design layout for component placement


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


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.

Isolated DC/DC converters & modules

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 PMP15006 LM5017 Fly-Buck Test Results Sep. 01, 2016
More literature Isolated Power Topologies for PLC I/O Modules and Other Low-Power Applications PDF | HTML Nov. 09, 2022

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