Isolated triple-output Fly-Buck Bias for PLC applications PMP9419 (ACTIVE)

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The PMP9419 reference design is a 3-output isolated Fly-Buck power supply for PLC applications. It takes 24V nominal input and provides 3 isolated sets of bias voltage, which are +15V@100mA, -15V@30mA, and 5V@17mA. Each set of rails is generated from one single transformer windings on the secondary side. A compact solution size is achieved (55.3mmx43.8mm). The design features the LM5017 synchronous buck converter configured as a Fly-Buck regulator. With the benefit of primary side regulation, the supply has the outputs regulated without the opto-coupler or additional transformer winding. The LM5017 has a wide Vin range which is up to 100V and 600mA output current capability with integrated switch FETs.

  • Three isolated outputs, +15V@100mA, -15V@30mA, 5V@17mA
  • Fly-Buck converter design, primary side regulation, compact solution for multiple isolated output supply
  • 81% peak efficiency.
  • LM5017 sync buck regulator, up to 100V wide Vin range, 600mA capability
  • This circuit board is tested, and the design files and test report are included.

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Design Files

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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 Documents

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User guides (1)
Title Type Size (KB) Date
PDF 481 27 Feb 2015
Design files (3)
Title Type Size (KB) Date
ZIP 180 27 Feb 2015
PDF 30 27 Feb 2015
PDF 120 27 Feb 2015

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