18-VDC - 30-VDC input multiple output flybuck reference design


Design files


This isolated flybuck reference design uses the LM3150 synchronous buck controller to generate one non-isolated output (3.3 V at 5 A) and two isolated outputs (5 V at 100 mA, 5 V at 100 mA) from a DC input (18 VDC - 30 VDC). The design can provide 17.5-W output power. Two additonal linear regulator LP2922A improve the regulation of the isolated outputs.

  • Primary side regulation without optical-coupler
  • Achieves over 90% peak efficiency
  • Compact and cost effective isolated solution
  • Constant on-time architecture which needs no loop compensation
Output voltage options PMP30502.1 PMP30502.2 PMP30502.3
Vin (Min) (V) 18 18 18
Vin (Max) (V) 30 30 30
Vout (Nom) (V) 3.3 5 5
Iout (Max) (A) 5 .1 .1
Output Power (W) 16.5 .5 .5
Isolated/Non-Isolated Non-Isolated Isolated Isolated
Input Type DC DC DC
Topology 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.

TIDT064.PDF (13541 K)

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


PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

AC/DC & DC/DC controllers (external FET)

LM31506V to 42V Synchronous Step-Down Controller with Adjustable Output Voltage

Data sheet: PDF | HTML
Linear & low-dropout (LDO) regulators

LP2992250-mA, 16-V, low-dropout voltage regulator with enable

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Test report 18-VDC - 30-VDC Input Multiple Output Flybuck Reference Design Dec. 21, 2018

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