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


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

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(Output Voltage 1)
(Output Voltage 2)
Vin (Min) (V)1818
Vin (Max) (V)3030
Vout (Nom) (V)5-5
Iout (Max) (A).25.25
Output Power (W)1.251.25
Input TypeDCDC

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  Offline & isolated DC/DC controllers & converters  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 documentation

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User guide (1)
Title Type Size (KB) Date
PDF 1671 01 Sep 2016
Design files (6)
Title Type Size (KB) Date
ZIP 216 01 Sep 2016
PDF 259 01 Sep 2016
ZIP 283 01 Sep 2016
PDF 60 01 Sep 2016
PDF 65 01 Sep 2016
PDF 81 01 Sep 2016

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