Ultra-Small 1W, 12V-36V Iso Power Supply for Analog Prog Logic Controller Modules Reference Design


Design files


Analog input and output modules are a standard component in Programmable Logic Controllera (PLC) or Distributed Control Systems (DCS). More channels per module and slimmer modules bring design challenges to the isolated power supply in those modules. Anyone facing those challenges will benefit from TIDA-00237, as the total design foot print is less than 2.54x2.54mm and less than 5mm height. It uses a fly-buck approach which means no optocoupler feedback with wide input voltage range of 12V-36V. The design provides +/-15V and 5V isolated, low noise outputs optimal for driving a data converter or analog front end.

  • Wide input voltage range: 12V to 36V (24VNOM)
  • 3 isolated outputs: 15VISO at 30mA ultra low noise, -15 VISO at 30mA ultra low noise, 5VISO at 40mA
  • ±2.5% output voltage accuracy
  • Ultra low profile < 5mm
  • IEC 61131-2 Compliant
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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.

TIDU855.PDF (824 K)

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


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

TIDCA73.ZIP (291 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.

Buck converters (integrated switch)

TPS6217528V, 0.5A Step-Down Converter with SNOOZE Mode

Data sheet: PDF | HTML
Isolated DC/DC converters & modules

LM50177.5-100V Wide Vin, 600mA Constant On-Time Synchronous Buck Regulator

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

TPS7A30200-mA, low-noise, high-PSRR, negative, adjustable low-dropout voltage regulator with enable

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

TPS7A49150-mA, 36-V, low-noise, high-PSRR, adjustable low-dropout voltage regulator with enable

Data sheet: PDF | HTML

Start development

Design tools & simulation

Simulation model

TIDA-00237 Simulation — TIDM054.ZIP (48 K)

Technical documentation

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Type Title Date
* Design guide Ultra-Thin Small Footprint 1-W, 12-V to 36-V Isolated Power Supply Design Guide Apr. 09, 2015

Related design resources

Design tools & simulation

TINA-TI SPICE-based analog simulation program

Reference designs

TIDA-00129 1W Small Form Factor Power Supply with Isolated Dual Output for PLC I/O Modules 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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