Wide-Input Isolated IGBT Gate-Drive Fly-Buck Power Supply for Three-Phase Inverters Reference Design


Design files


This reference design provides isolated positive and negative voltage rails required for Insulated Gate Bipolar Transistor (IGBT) gate drivers from a single 24-volt DC input supply. Utilizing a Fly-Buck™ control topology, this reference design uses a single transformer for generating power rails for all three arms of the 3-phase inverter.  It uses primary-side regulation and can achieve good cross regulation without opto-coupler feedback or an auxiliary winding. The isolated outputs are generated through the coupled windings of the transformer. The voltage rails for all the high-side IGBTs are individually isolated, whereas the voltage rails for all low-side IGBTs are combined.


• Isolated power supply with 24V±20% input range that supports 6 IGBT gate drivers for 3-phase inverter (each arm in half-bridge configuration)
• Low-ripple (<200mV) bias outputs (+15V & -8V) with output power of 2.3W for each IGBT of the 3-phase inverter
• Fly-Buck topology provides easy-to-design multi-output isolated power supply solution with primary side regulation
• Peak efficiency of 82% at balanced full-load
• Output capacitors rated to support up to 6A peak gate drive current

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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.


Detailed schematic diagram for design layout and components


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


Detailed overview of design layout for component placement

TIDRCA9.ZIP (1352 K)

Files used for 3D models or 2D drawings of IC components

TIDC832.ZIP (348 K)

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


PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Isolated DC/DC converters & modules

LM5160LM5160 wide input 65V, 2A synchronous buck/Fly-Buck™ converter

Data sheet: PDF | HTML
Isolated DC/DC converters & modules

LM5160ALM5160A Wide Input 65V, 2A Synchronous Buck / Fly-Buck™ Converter

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* User guide Wide-Input Isolated IGBT Gate-Drive Fly-Buck Pwr Supply for 3-Phase Inverters (Rev. A) Jan. 27, 2015
More literature Powering IGBT Drivers with Fly-Buck™ Dec. 03, 2015
White paper Designing isolated rails on the fly with Fly-Buck™ converters Sep. 29, 2015
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

Related design resources

Reference designs

TIDA-00181 Isolated IGBT Gate-Drive Push-Pull Power Supply with 4 Outputs TIDA-00182 Reinforced Isolated IGBT Gate Drive Flyback Power Supply with 8 Outputs Reference Design

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