15W Isolated Self-Driven Synchronous Inverting Fly-Buckboost Using LM5160 Regulator Reference Design


Design files


PMP10571 is a sync isolated Flybuck-boost converter with a negative primary voltage. The power supply has a synchronous buck regulator, LM5160, and a versa pack transformer. The synchronous rectifier on the secondary improves efficiency and regulation under heavy load. The design accepts an input voltage of 18V to 30V, and outputs 5V, capable of providing 3A of current to the load, making it suitable for 24V input industrial application. The Fly-Buck topology can regulate the secondary side outputs without opto-coupler or aux winding, and is capable of achieving good regulation within ±5%. With LM5160's Constan On-Time control, no loop compensation is required, which  simplifies the design and helps reducing the external part count and BOM cost.

  • Versa pack transformer increase design versatility
  • +5V/3A with LM5160 capable of 4.5V to 65V input
  • Primary Side Regulation without Opto, Good Regulation, within +/-5%
  • Synchronous rectifier on the secondary winding improves efficiency and regulation.
  • Constant On Time Control, No Loop Compensation Required, and Fast Transient Response
  • No primary winding snubber is required
Output voltage options PMP10571.1
Vin (Min) (V) 18
Vin (Max) (V) 30
Vout (Nom) (V) 5
Iout (Max) (A) 3
Output Power (W) 15
Isolated/Non-Isolated Isolated
Input Type DC
Topology 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

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TIDU909.PDF (1814 K)

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

TIDRE57.PDF (158 K)

Detailed schematic diagram for design layout and components

TIDRE58.PDF (105 K)

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

TIDRE60.ZIP (432 K)

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

TIDCA42.ZIP (95 K)

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

TIDRE59.PDF (610 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

AC/DC & DC/DC converters (integrated FET)

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

Data sheet: PDF | HTML

CSD18534Q5A60-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 9.8 mOhm

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Test report PMP10571 Test Results Apr. 10, 2015

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