Factory Automation (FA) Isolated Sensor Reference Design

(ACTIVE) PMP11373

Description & Features

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Key Document

Description

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.

Features
  • 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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Parametrics
 PMP11373.1
(Output Voltage 1)
PMP11373.2
(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
Isolated/Non-IsolatedNon-IsolatedNon-Isolated
Input TypeDCDC
TopologyHalf BridgeHalf Bridge

TI Devices (4)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
DRV8801  2.8A Brushed DC Motor Driver with Current Sense (PH/EN Ctrl)  Brushed DC (BDC) Drivers  Sample & Buy View Design Kits & Evaluation Modules
LM4040  Precision Micropower Shunt Voltage Reference  Voltage Reference  Sample & Buy View Design Kits & Evaluation Modules
LMC555  World’s smallest 555 timer with low power, high accuracy and a Fmax of 3MHz  Clock and Timing  Sample & Buy View Design Kits & Evaluation Modules
TPS7A49  Vin 3V to 36V, 150mA, Ultra-Low-Noise, High-PSRR Low-Dropout (LDO) Linear Regulator  Linear Regulator (LDO)  Sample & Buy View Design Kits & Evaluation Modules

Technical Documents

View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.

User guides (1)
Title Abstract Type Size (KB) Date Views TI Recommends
PDF 1831 30 Mar 2016 20
Design files (6)
Title Abstract Type Size (KB) Date Views
ZIP 334 30 Mar 2016 17
ZIP 33833 30 Mar 2016 19
PDF 525 30 Mar 2016 18
PDF 104 30 Mar 2016 15
PDF 123 30 Mar 2016 26
PDF 182 30 Mar 2016 50

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