Factory Automation (FA) Isolated Sensor Reference Design
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Key Document


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

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Design Files

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(Output Voltage 1)
(Output Voltage 2)
Vin (Min) (V)21.621.6
Vin (Max) (V)26.426.4
Vout (Nom) (V)155
Iout (Max) (A).15.15
Output Power (W)2.25.75
Input TypeDCDC
TopologyHalf BridgeHalf Bridge

TI Devices (4)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
DRV8801  40-V, 2.8-A H-bridge motor driver with current feedback  Motor drivers  Sample & Buy View Design Kits & Evaluation Modules
LM4040  Fixed voltage, 45-µA, precision micropower shunt voltage reference  Voltage references  Sample & Buy View Design Kits & Evaluation Modules
LMC555  World’s smallest 555 timer with low power, high accuracy and a Fmax of 3MHz  Clocks & timing  Sample & Buy View Design Kits & Evaluation Modules
TPS7A49  150-mA, 36-V, low-noise, high-PSRR, 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)
DRV8801 Download Download
Download Download
LM4040 Download
LMC555 Download Download
TPS7A49 Download Download
Download Download

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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 1831 30 Mar 2016
Design files (6)
Title Type Size (KB) Date
ZIP 334 30 Mar 2016
ZIP 33833 30 Mar 2016
PDF 525 30 Mar 2016
PDF 104 30 Mar 2016
PDF 123 30 Mar 2016
PDF 182 30 Mar 2016

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