Factory Automation (FA) Isolated Sensor Reference Design


Design files


Dual isolated half-bridge converters are implemented using a single DRV8801 motor driver controller. The DRV8801 controller operates from a 24Vdc input and at a fixed 50% duty, generated using the low cost LMC555 timer. Transformer secondaries are rectified and regulated to 5V and 15V outputs using TPS7A4901 linear regulators, which supply 0.15A each. This method allows the opto-coupler to be eliminated, reducing cost and complexity. Design options allow single or dual outputs per transformer.

  • Isolated (3KV) outputs without opto-coupler feedback
  • One DRV8801 motor drive controller can drive two transformers
  • Low cost solution
  • Low noise outputs
Output voltage options PMP11373.1 PMP11373.2
Vin (Min) (V) 21.6 21.6
Vin (Max) (V) 26.4 26.4
Vout (Nom) (V) 15 5
Iout (Max) (A) .15 .15
Output Power (W) 2.25 .75
Isolated/Non-Isolated Non-Isolated Non-Isolated
Input Type DC DC
Topology Half Bridge Half Bridge

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.

TIDUBN7.PDF (1884 K)

Test results for the reference design, including efficiency graphs, test prerequisites and more


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

TIDRL01.ZIP (33833 K)

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


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

TIDRL00.PDF (525 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Linear & low-dropout (LDO) regulators

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

Data sheet document-pdfAcrobat PDF open-in-new HTML
Brushed DC (BDC) motor drivers

DRV880140-V, 2.8-A H-bridge motor driver with current feedback

Data sheet document-pdfAcrobat PDF open-in-new HTML
Real-time clocks (RTCs) & timers

LMC555World’s smallest 555 timer with low power, high accuracy and a Fmax of 3MHz

Data sheet document-pdfAcrobat PDF open-in-new HTML
Shunt voltage references

LM4040Fixed voltage, 45-µA, precision micropower shunt voltage reference

Data sheet document-pdfAcrobat PDF open-in-new HTML

Technical documentation

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Type Title Date
* Test report PMP11373 Test Results Mar. 30, 2016

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