Input Protection and Backup Supply Reference Design for 25W PLC Controller Unit


Design files


The TIDA-03031 reference design provides a solution for input power path protection and backup supply design in a typical PLC controller unit. It replaces traditionally used discrete-circuit implementations with fully integrated protection circuits.

  • 19.2-V to 28.8-V input, 28-W output power
  • Overload, overvoltage, undervoltage, and reverse-current protection
  • Protects from field miswiring or reverse polarity
  • ±500-V, 2-Ω (8/20-μs) surge compliance with Criteria A performance (IEC 61000-4-5)
  • 120-ms backup time at 7-W output
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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.

TIDUCC7.PDF (2674 K)

Reference design overview and verified performance test data

TIDRO50.PDF (353 K)

Detailed schematic diagram for design layout and components

TIDRO51.PDF (72 K)

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

TIDRO52.PDF (195 K)

Detailed overview of design layout for component placement

TIDRO54.ZIP (652 K)

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


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

TIDRO53.PDF (795 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

eFuses & hot swap controllers

TPS26604.2-V to 60-V, 150mΩ, 0.1-2.23A eFuse with integrated input reverse polarity protection

Data sheet: PDF | HTML
AC/DC & DC/DC converters (integrated FET)

LM50023.1-75V Wide Vin, 0.5A Current Mode Boost, Flyback, Sepic Converter

Data sheet: PDF | HTML
AC/DC & DC/DC converters (integrated FET)

LM5160LM5160 wide input 65V, 2A synchronous buck/Fly-Buck™ converter

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Design guide Input Protection and Backup Supply for 25-W PLC Controller Unit Design Guide Oct. 24, 2016
Technical article How an eFuse can help provide robust industrial power path protection PDF | HTML Oct. 31, 2016

Related design resources

Reference designs

TIDA-00233 24VDC 10A eFuse and Protection Circuit for Programmable Logic Controllers (PLC) TIDA-00500 Capacitor-Based Backup Power Supply for PLC Modules Reference Design

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