Dual Output Non-Isolated Flybuck Reference Design


Design files


PMP10733 uses the LM5160 in a Fly-Buck-Boost topology with the primary set as to a negative voltage.  Setting the primary side to a negative voltage reduces the turn’s ratio of the transformer and yield better line and load regulation as a result.  The primary and secondary voltages are set to negative 15V and positive 15V respectively.  The maximum operating current on the primary and secondary rails are set to 150mA.  The switching frequency is set to 200 kHz.

  • 5V to 20V in, +/-15V @150mA output, 4.5W Pout total, IC capable of 6V to 60Vin
  • 81% peak efficiency
  • Compact solution with Coupled inductor
  • Solution size: 20x20 mm (0.8x0.8 inch); max component height: 4.5mm
  • Board size: 38 x 38 mm (1.5 x 1.5 inch), 2 layer board, 1oz copper
Output voltage options PMP10733.1 PMP10733.2
Vin (Min) (V) 5 5
Vin (Max) (V) 20 20
Vout (Nom) (V) 15 -15
Iout (Max) (A) .15 .15
Output Power (W) 2.25 2.25
Isolated/Non-Isolated Non-Isolated Non-Isolated
Input Type DC DC
Topology 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.


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


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


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

TIDCC63.ZIP (221 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

Technical documentation

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Type Title Date
* Test report PMP10733 Test Results (LM5160 Fly Buck Boost ) May 10, 2016
More literature Isolated Power Topologies for PLC I/O Modules and Other Low-Power Applications PDF | HTML Nov. 09, 2022

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