Isolated Octo-output Fly-Buck Bias for IGBT Driver - Reference Design


Design files


The PMP10531 reference design is an 8-output isolated Fly-Buck power supply for IGBT gate driver in motor drive or high voltage inverter applications. It takes 24V nominal input and provides 4 isolated sets of (+15V, -8V) bias voltage. The board is designed to provide driver bias power for 6 IGBTs in 3-phase configuration: 3 sets of outputs for the 3 top side IGBTs with 100mA output current, and 1 set of 300mA outputs for all the bottom IGBTs. Each set of positive/negative rails is generated from one single transformer windings using voltage split circuit. A compact solution size is achieved (62x55mm). The design features the LM5160 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 LM5160 has a wide Vin range of 4.5V to 65V and 1.5A output current capability with integrated switch FETs. The input voltage to the reference board can be loosely regulated with a range of 20V to 30V.


• Eight isolated outputs, 1x(+15V/-8V @ 300mA), 3x(+15V/-8V @ 100mA), ideal for 3-phase AC motor and inverter applications
• Fly-Buck converter design, primary side regulation, compact solution for multiple isolated output supply
• Wide input voltage range of 20V to 30V
• Provides 2.3W supply power for each of the 6 IGBT drivers, 82% peak efficiency.
• LM5160 sync buck regulator, up to 65V wide Vin range, 1.5A capability
• This circuit board is tested, and the design files and test report are included.

Output voltage options PMP10531.1 PMP10531.2 PMP10531.3 PMP10531.4
Vin (Min) (V) 20 20 20 20
Vin (Max) (V) 30 30 30 30
Vout (Nom) (V) -8 15 -8 15
Iout (Max) (A) .3 .1 .1 .3
Output Power (W) 2.4 1.5 .8 4.5
Isolated/Non-Isolated Isolated Isolated Isolated Isolated
Input Type DC DC DC DC
Topology FlyBuck FlyBuck FlyBuck FlyBuck
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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.

TIDU685.PDF (407 K)

Test results for the reference design, including efficiency graphs, test prerequisites and more

TIDRC34.PDF (344 K)

Detailed schematic diagram for design layout and components

TIDRC35.PDF (83 K)

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

TIDC806.ZIP (224 K)

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

TIDRC36.PDF (833 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

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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View all 3
Type Title Date
Technical article APEC 2015 – using the Fly-Buck™ converter for IGBT gate drive bias Mar. 14, 2015
Technical article Simplifying higher current split-rail designs with Fly-Buck converters Mar. 05, 2015
Test report PMP10531 Test Results Dec. 10, 2014

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