1W Small Form Factor Power Supply with Isolated Dual Output for PLC I/O Modules


Design files


This reference design is a 1W power supply with dual isolated outputs for space constrained applications. With  24V and 3.3V isolated outputs, this design was created specifcally to power Programmable Logic Controller (PLC) I/O modules in a factory automation setting. This design was created to comply with IEC 61010-1, which in turn will provide a designer faster time to market with their own design.

  • Designed to comply with IEC61010-1
  • Small form factor for space constraint I/O cards: 51 x 40 x 5.97 mm (L x W x H)
  • Up to 87% efficiency for low heat dissipation in small plastic housings
  • A complete and cost effective design for I/O cards
  • ±10% output voltage accuracy
  • Wide input voltage range: 17V to 36V (24VNOM)
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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.

TIDU263A.PDF (3264 K)

Reference design overview and verified performance test data

TIDR479.PDF (76 K)

Detailed schematic diagram for design layout and components

TIDR480.PDF (71 K)

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

TIDC337.ZIP (32 K)

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


Includes TI products in the design and potential alternatives.

Isolated DC/DC converters & modules

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Data sheet: PDF | HTML

Technical documentation

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* Design guide 1-W Small Form Factor Power Supply with Isolated Dual Output for PLC I/O Modules (Rev. A) Jun. 12, 2015

Related design resources

Reference designs

TIDA-00237 Ultra-Small 1W, 12V-36V Iso Power Supply for Analog Prog Logic Controller Modules Reference Design TIDA-00400 Isolated Power Supply for Programmable Logic Controller (PLC) IO Modules Reference Design TIDA-00401 Isolated DC/DC Power Supply for PLC Analog Input and Output Module Reference Design

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