10.8Vin~13.2Vin, 5Vout @ 300mA, Isolated Self-Driven Synchronous Flybuck Converter Reference Design


Design files


An isolated flybuck converter with self-driven synchronous rectification on the secondary side accepts an input voltage of 10.8Vin to 13.2Vin and provides an isolated output of 5Vout capable of supplying a maximum of 0.3A of current to the load.

  • Excellent regulation 4.9Vout ± 3.1% over entire line and load range without opto or discrete Vref
  • No need for pre-load on isolated output, without output voltage rise at light load
  • Improved load regulation, smaller voltage droop at heavy load
  • LM5017 wide Vin range 7.5V to 100V
  • Easy-to-design, cost effective Fly-Buck solution
  • Constant On-Time control, no loop compensation required
Output voltage options PMP9291.1
Vin (Min) (V) 10.8
Vin (Max) (V) 13.2
Vout (Nom) (V) 5
Iout (Max) (A) .3
Output Power (W) 1.5
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

Download ready-to-use system files to speed your design process.

SNVU416A.PDF (1146 K)

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

SNVR428A.PDF (292 K)

Detailed schematic diagram for design layout and components

SNVR429A.PDF (122 K)

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


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

TIDCB36.ZIP (244 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

LM50177.5-100V Wide Vin, 600mA Constant On-Time Synchronous Buck Regulator

Data sheet: PDF | HTML
N-channel MOSFETs

CSD17507Q5A30-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 10.8 mOhm

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Test report PMP9291 Test Results (Rev. A) Sep. 29, 2015

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