4-20 mA Loop Sensor Isolated Power Supply


Design files


The TPS54061 is used in a buck topology with an auxillary winding providing power to the primary side and isolated side of a isolated system. The high efficiency of this topology provides more output current from a system powered from a current limited input source. The isolated output is post regulated with an LDO for best regulation.



• Synchronous buck for high integration and high efficiency
• 60-V wide input voltage range
• 90-µA non-switching input current
• Auxillary winding provides a highly efficient low current isolated output
• Built and tested circuit and PCB design

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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.

TIDU826.PDF (498 K)

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

TIDRD73A.PDF (186 K)

Detailed schematic diagram for design layout and components

TIDRD74A.PDF (211 K)

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

TIDRD75.PDF (91 K)

Detailed overview of design layout for component placement

TIDRD77.ZIP (1422 K)

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

TIDRD76.PDF (366 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

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Linear & low-dropout (LDO) regulators

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Technical documentation

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Type Title Date
White paper Valuing wide VIN, low EMI synchronous buck circuits for cost-driven, demanding a (Rev. A) Apr. 10, 2019
Test report PMP10977 Test Results Mar. 05, 2015

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