Isolated Octo-output Fly-Buck Bias for IGBT Driver - Reference Design PMP10531 (ACTIVE)

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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.

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Design Files

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(Output Voltage 1)
(Output Voltage 2)
(Output Voltage 3)
(Output Voltage 4)
Vin (Min) (V)20202020
Vin (Max) (V)30303030
Vout (Nom) (V)-815-815
Iout (Max) (A).
Output Power (W)

TI Devices (2)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LM5160  LM5160 wide input 65V, 2A synchronous buck/Fly-Buck™ converter  Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules
LM5160A  LM5160A Wide Input 65V, 2A Synchronous Buck / Fly-Buck™ Converter  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)
LM5160 Download Download
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LM5160A Download Download

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Technical Documents

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User guides (1)
Title Type Size (KB) Date
PDF 341 10 Dec 2014
Design files (4)
Title Type Size (KB) Date
ZIP 224 10 Dec 2014
PDF 833 10 Dec 2014
PDF 83 10 Dec 2014
PDF 344 10 Dec 2014

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