Reference Design: Isolated IGBT Gate-Drive Fly-Buck™ Power Supply with 4 Outputs


Design files


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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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.

TIDU478.PDF (1901 K)

Reference design overview and verified performance test data

TIDR999.PDF (131 K)

Detailed schematic diagram for design layout and components

TIDRA00.PDF (418 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDC552.ZIP (202 K)

Design file that contains information on physical board layer of design PCB

TIDRA01.PDF (702 K)

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
Application note Analysis of Power Supply Topologies for IGBT Gate Drivers in Industrial Drives Jul. 06, 2015
Application note Is Your IGBT Gate-Driver Power Supply Optimized Mar. 12, 2015
Design guide Isolated IGBT Gate-Drive Fly Buck Power Supply With 4 Outputs (TIDA-00174) Aug. 05, 2014

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