Capacitor-Based Backup Power Supply for PLC Modules Reference Design
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Key Document


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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Schematic/Block Diagram

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Design Guide

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Design Files

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TI Devices (6)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LM334  0°C to 70°C 3-pin adjustable current source  Voltage references  Sample & Buy Not Available
LM5001  3.1-75V Wide Vin, 1A Current Mode Non-Synchronous Switch Mode Regulator  Step-up (boost) regulators  Sample & Buy View Design Kits & Evaluation Modules
LM5069  9-V to 80-V hot swap controller with power limiting  Power switches  Sample & Buy View Design Kits & Evaluation Modules
LMV331-N  Single General Purpose, Low Voltage, Tiny Pack Comparator  Amplifiers  Sample & Buy Not Available
OPA348  1MHz, 45uA, RRIO, Single Op Amp  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
TPS7A4101  50-mA, 50-V, low-IQ, adjustable low-dropout voltage regulator with enable  Power management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
LM334 Download Download
Download Download
LM5001 Download Download
Download Download
LM5069 Download Download
LMV331-N Download Download
Download Download
OPA348 Download Download
Download Download
Download Download
TPS7A4101 Download Download

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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 1219 14 Oct 2015
Design files (6)
Title Type Size (KB) Date
ZIP 384 24 Sep 2015
ZIP 1346 24 Sep 2015
PDF 529 24 Sep 2015
PDF 98 24 Sep 2015
PDF 74 24 Sep 2015
PDF 756 24 Sep 2015

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