Differential Pulse Train Output (PTO) Programmable Logic Controller (PLC) Module Reference Design


Design files


The differential pulse-train output (PTO) reference design illustrates the design of a differential high-speed digital output module using a RS-485 driver powered from the PLC backplane using isolated fly-buck power converter. The reference design is mainly used in positioning and motion control systems to allow simple distant high-speed motor control in noisy environments.

  • 4 high-speed differential digital output channels
  • 1-MHz pulse frequency
  • 25-mA maximum load current per channel for 100-Ω load
  • 750-mW total power consumption from backplane isolated power stage (150 mA)
  • Parallel control for simple MCU interface
  • Beaglebone Black cape form factor for easy evaluation using TIDEP0027
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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.

TIDUC30A.PDF (1079 K)

Reference design overview and verified performance test data

TIDRN54.PDF (839 K)

Detailed schematic diagram for design layout and components

TIDRN55.PDF (65 K)

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

TIDRN56.PDF (331 K)

Detailed overview of design layout for component placement

TIDRN58.ZIP (1468 K)

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


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

TIDRN57.PDF (1508 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

RS-485 & RS-422 transceivers

SN65LBC174AQuadruple RS-485 Differential Line Drivers

Data sheet: PDF
Digital isolators

ISO7140CCQuad-channel, 4/0, 50-Mbps digital isolator

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

TPS550102.95V To 6V Input, 2W, Isolated DC/DC Converter with Integrated FETS

Data sheet: PDF | HTML

Start development

Design tools & simulation

Simulation model

TIDA-00766 Simulation — TIDM047.ZIP (62 K)

Technical documentation

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Type Title Date
* Design guide Differential Pulse Train Output (PTO) Programmable Logic Controller (PLC) Module (Rev. A) Oct. 13, 2016

Related design resources

Design tools & simulation

TINA-TI SPICE-based analog simulation program

Reference designs

TIDEP0027 High Performance Pulse Train Output (PTO) with PRU-ICSS for Industrial Applications Reference Design

Support & training

TI E2E™ forums with technical support from TI engineers

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