3.75W Single Output Industrial PoE Isolated Flybuck Reference Design
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Key Document


PMP20814 is an isolated Flybuck converter utilizing the LM5018 for industrial applications. This design has a minimum operating input voltage of 43V and a maximum input voltage of 53V. The design has a primary output of 7.35V and a secondary output capable of sourcing 0.25A continuous current at 15Vout. Switching frequency is set to 250kHz. A custom transformer is used. PMP10543’s PCB was used to build the design.

  • Primary side regulation without opto, good regulation, within +/-5%
  • No loop compensation required/fast transient response
  • Low BOM count and cost, compact solution size
  • No RC snubber at primary winding

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Design Files

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(Output Voltage 1)
Vin (Min) (V)43
Vin (Max) (V)53
Vout (Nom) (V)15
Iout (Max) (A).25
Output Power (W)3.75
Input TypeDC

TI Devices (1)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LM5018  7.5-100V Wide Vin, 300mA 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)
LM5018 Download Download
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Technical Documents

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User guides (1)
Title Type Size (KB) Date
PDF 905 17 May 2017
Design files (5)
Title Type Size (KB) Date
ZIP 68 17 May 2017
ZIP 293 17 May 2017
PDF 283 17 May 2017
PDF 96 17 May 2017
PDF 121 17 May 2017

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