Isolated Power Supplies Reference Design


Design files


This reference design demonstrates how to create a 3.3V or 5V isolated power supply for isolated RS-485, CAN or similar applications. There are five separate supplies on the board for different cases of input and output voltage, with and without regulated outputs.

  • Push-pull driver for small transformers
  • High primary-side current drive
  • Low ripple on rectified output
  • Small footprint
  • Single 3.3V or 5V supply
  • This reference design is orderable

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Design files & products

Design files

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

TIDU161.PDF (96 K)

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

TIDR255.PDF (58 K)

Detailed schematic diagram for design layout and components

TIDR256.PDF (108 K)

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

TIDC180.ZIP (321 K)

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


Includes TI products in the design and potential alternatives.

Transformer drivers

SN6501Low-noise, 350-mA, 410-kHz transformer driver for isolated power supplies

Data sheet: PDF | HTML

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Evaluation board

SN6501-MULXFMR-EVM — SN6501 transformer driver for isolated power supplies evaluation module

The SN6501-Multi-Xfmr EVM is configured with five independent circuits providing options to operate using either a +3.3Vdc or +5.0Vdc input and provides isolated 3.3Vdc or 5.0Vdc outputs. Two of the circuits include LDO's to regulate the output. The five configurations include 3Vdc-to-3Vdc with no (...)

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Technical documentation

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Type Title Date
Test report TIDA-00004 Test Results Sep. 26, 2013

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