5-V input, 4000-VAC isolation power supply reference design


Design files


This reference design introduces a 5-V, 200-mA output Flyback DC-DC power converter targeting RS485 application in data concentrator.

The 4000-VAC isolation power circuit is a simple and cost-effective solution as it uses a fully integrated converter TLV61046A and off-the-shelf transformer. The entire circuit is easy to copy into the system board to power RS485 device, greatly reducing the design time of circuit schematic and layout.

Detail bench test results such as efficiency, load regulation and operating waveform are provided in the user guide for reference.

  • 4.5-V to 5.5-V input-voltage range
  • 5-V output voltage with 200-mA maximum output
  • 4000-VAC isolation-voltage transformer
  • Primary-side regulation to minimize solution cost
  • Circuit tested with evaluation board
Output voltage options TIDA-050032
Vin (Min) (V) 4.5
Vin (Max) (V) 5.5
Vout (Nom) (V) 5
Iout (Max) (A) .2
Output Power (W) 1
Isolated/Non-Isolated Isolated
Input Type DC
Topology Boost- Non Sync
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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.


Reference design overview and verified performance test data

TIDM234.PDF (77 K)

Detailed schematic diagram for design layout and components

TIDM235.PDF (96 K)

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

TIDM236.PDF (40 K)

Detailed overview of design layout for component placement

TIDM238.ZIP (319 K)

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


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

TIDM237.PDF (189 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Boost converters (integrated switch)

TLV61046A28-V Output Voltage Boost Converter with Power Diode and Isolation Switch

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Design guide 5 V Output, 4000-VAC Isolation Power Supply Reference Design Oct. 07, 2019

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