TIPD135

10uA-100mA, 0.05% Error, High-Side Current Sensing Solution Reference Design

TIPD135

Design files

Overview

This TI Precision Verified Design provides the theory, component selection, simulation, complete PCB schematic and layout, bill of materials, and measured performance of a split-supply, high-side four decade current sensing solution that can accurately detect load currents from 10uA-100mA. The corresponding linear output is from 10mV to 4.9V which enables measurement by common 5V ADCs. The design utilizes the PGA281, an instrumentation amplifier with pin-programmable gain and a wide common-mode voltage range, to provide a more accurate and versatile solution than traditional op amps.

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Features
  • High-Side, Four Decade, Bi-directional, Current Sensing Verified Solution
  • Senses Current from 10uA-100mA with <0.05% Error
  • Supports up to ±12.5V Common-mode Input Range
  • 10mV to 4.9V output for measurement by common 5V ADCs
  • Utilizes PGA281 pin-programmable gain instrumentation amplifier to achieve four decade current measurement

 

    This Verified Design Includes:

  • Theory
  • Component Selection
  • TINA-TI Simulation
  • Schematics and PCB Layout
  • Verification and Measured Performance
  • Modification Options

 

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDC030.ZIP (3467 K)

Detailed schematic diagram for design layout and components

TIDR143.PDF (144 K)

Detailed schematic diagram for design layout and components

TIDR144.PDF (188 K)

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

TIDC001.ZIP (680 K)

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

Products

Includes TI products in the design and potential alternatives.

Linear & low-dropout (LDO) regulators

TPS7A410150-mA, 50-V, low-IQ, adjustable low-dropout voltage regulator with enable

Data sheet document-pdfAcrobat PDF open-in-new HTML
Programmable & variable gain amplifiers (PGA/VGA)

PGA281Zero-Drift, High Voltage Programmable Gain Amplifier

Data sheet document-pdfAcrobat PDF

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Software

Support software

TIPD135 Simulation – TIDC002.ZIP (2475 K)

Support software

TIPD135 Test Files – TIDC003.ZIP (252 K)

Technical documentation

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Type Title Date
* User guide 10-uA to 100-mA 0.05%-Error High-Side Current Sensing Design Guide Oct. 03, 2013
Technical article How to layout a PCB for an instrumentation amplifier Oct. 14, 2016

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