Small Form Factor 12W Ultra Wide Range Power Supply for Protection Relays - Reference Design


Design files


This small form factor, 12W power supply solution for protection relays handles an ultra-wide range of both AC and DC inputs making it a suitable platform to power a variety of lower power protection relays that need to be placed in a small housing.  The power supply is designed to output industry standard voltages required in protection relays while also providing excellent line and load regulation.  This solution has been engineered for high wattage with good efficiency and has also been pre-compliance tested for IEC61000-4 (EFT and Surge) and CISPR 11 Class A (Interference).

  • Small size yet handles ultra-wide range AC and DC inputs
  • Enables usage in a variety of Protection Relays and RTUs
  • Accurate outputs with excellent load and line regulation in the 3% range
  • Platform solution with high wattage capability while providing efficiencies up to 78%
  • Passes Pre-Compliance testing - IEC61000-4 (EFT and Surge) and CISPR 11 Class A (Interference)
  • Power interruption handling with Ride Through > 75mS
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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.


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

TIDRAR7.ZIP (3040 K)

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

TIDC650.ZIP (301 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 controllers (external FET)

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Data sheet: PDF | HTML
AC/DC & DC/DC controllers (external FET)

UCC28740Constant-Voltage, Constant-Current (CVCC) Flyback controller with Secondary Side Regulation (SSR)

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

LM3371.5-A, negative, adjustable linear voltage regulator

Data sheet: PDF | HTML
Shunt voltage references

TL431Adjustable precision shunt regulator

Data sheet: PDF | HTML
Supervisor & reset ICs

LMS33460Ultra-low power, space-saving 3-V undervoltage detector

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* User guide 12-W Ultra-Wide Input Range Power Supply (TIDA-00227) Sep. 25, 2014

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