Isolated Power Supply for Programmable Logic Controller (PLC) IO Modules Reference Design


Design files


The TIDA-00400 isolated power supply reference design provides multiple isolated outputs to supply the bias voltage needed in a Programmable Logic Controller (PLC) IO module. It generates 3 isolated outputs: ±15V@30mA and +5V@40mA. These voltage rails can satisfy most of the required voltage rails in the IO modules, such as the Op-Amp, DAC bias, RS-485 transmitter and digital isolator power supplies.

  • Wide input voltage range: 18 to 30 V (24 VNOM)
  • Non-Isolated output: 3.3V with 50mA
  • Three isolated outputs:
    • +15V with 30mA
    • -15V with 30mA
    • +5V with 40mA
  • Small form factor for space constrained I/O cards 51 x 51 x 8 mm (L x W x H)
  • Primary-side regulation (no need for optocoupler) increases lifetime reliability
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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.

TIDU854A.PDF (9299 K)

Reference design overview and verified performance test data


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

TIDRDQ0.ZIP (5681 K)

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

TIDCA01.ZIP (166 K)

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

TIDCA02.ZIP (720 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
Linear & low-dropout (LDO) regulators

TPS709150-mA, 30-V, ultra-low-IQ, low-dropout voltage regulator with reverse current protection and enable

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

TPS7A30200-mA, low-noise, high-PSRR, negative, adjustable low-dropout voltage regulator with enable

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

TPS7A471-A, 36-V, low-noise, high-PSRR, low-dropout voltage regulator with enable

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Design guide Isolated Power Supply for PLC I/O Modules Design Guide (Rev. A) Apr. 02, 2015

Related design resources

Reference designs

TIDA-00129 1W Small Form Factor Power Supply with Isolated Dual Output for PLC I/O Modules TIDA-00237 Ultra-Small 1W, 12V-36V Iso Power Supply for Analog Prog Logic Controller Modules Reference Design TIDA-00401 Isolated DC/DC Power Supply for PLC Analog Input and Output Module Reference Design

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