Capacitor-Based Backup Power Supply for PLC Modules Reference Design


Design files


TIDA-00500 is a reference design to provide power to load for short duration of time after a power interrupt has occurred. Traditionally Programmable Logic Controllers (PLCs) are equipped with a recharge battery source for alternative power. This battery source often suffers from drawbacks like complex charging topologies, charging time, periodic maintenance, and eco-hazards. In scenarios where PLCs need to be functional for a short duration of time after power interrupt, a capacitor based backup is a much simpler and more effective approach because of the higher power density in comparison to a standard battery-based solution.

  • Backup energy up to 6 joules (J)
  • Inrush current protection with auto retry
  • Capacitor charging time less than 0.5s
  • Lower BOM Cost
  • Design guide provides detailed description and performance test data
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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


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

TIDRHE0.ZIP (1346 K)

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

TIDCB05.ZIP (384 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.

AC/DC & DC/DC converters (integrated FET)

LM50013.1-75V Wide Vin, 1A Current Mode Non-Synchronous Switch Mode Regulator

Data sheet: PDF | HTML

LMV331-NSingle General Purpose, Low Voltage, Tiny Pack Comparator

Data sheet: PDF | HTML
Current references

LM3340°C to 70°C 3-pin adjustable current source

Data sheet: PDF
General-purpose op amps

OPA348Single, 5.5-V, 1-MHz, low quiescent current (45-μA), RRIO operational amplifier

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

TPS7A410150-mA, 50-V, low-IQ, adjustable low-dropout voltage regulator with enable

Data sheet: PDF | HTML
eFuses & hot swap controllers

LM50699-V to 80-V hot swap controller with power limiting

Data sheet: PDF

Technical documentation

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Type Title Date
* Design guide Capacitor-Based Backup Power Supply for PLC Modules Design Guide (Rev. A) Oct. 14, 2015

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