Reference Design: Isolated IGBT Gate-Drive Fly-Buck™ Power Supply with 4 Outputs
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The TIDA-00174 reference design is a 4-output isolated Fly-Buck power supply for IGBT gate drive bias. It generates two sets of (+16V, -9V) voltage output with 100mA output current capability. The positive/negtaive bias voltages are used to power the high power IGBT gate drivers, and the design is suitable to support driving IGBTs.

This Fly-Buck design  features the LM5017, 7.5-100V wide Vin, 600mA, Constant On-Time (COT), synchronous buck regulator. It provides an easy-to-design and cost effective isolated power solution. The Fly-Buck having the nature of primary side regulation can achieve better regulation and line/load response over other open-loop or aux winding feedback topologies. It is capable of operating from a loosely regulated 24V input (+/-20%). The board comes with plug-in header pins, and it is compatible with the C2000 HV inverter kit.

  • Fly-Buck power supply for IGBT gate drive bias, primary side regulation without opto or aux winding feedback
  • 2 pair of isolated positive/negative voltage rails suitable for biasing two IGBTs
  • Output 2x (+16V, -9V), 100mA each, 2.5W per IGBT driver
  • Operates from unregulated 24V+/-20% input
  • 87% peak efficiency, <55mV output ripple
  • This design is compatible and tested with the C2000 HV inverter kit

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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 documentation

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Application note (2)
Title Type Size (KB) Date
PDF 7246 06 Jul 2015
PDF 115 12 Mar 2015
User guide (1)
Title Type Size (KB) Date
PDF 1901 05 Aug 2014
Design files (4)
Title Type Size (KB) Date
ZIP 202 05 Aug 2014
PDF 702 05 Aug 2014
PDF 418 05 Aug 2014
PDF 131 05 Aug 2014

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