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TIPD129

0-1A, Single-Supply, Low-Side, Current Sensing Solution

Design files

TIPD129

Design files

Overview

This TI Verified Design implements a single-supply, low-side current sensing solution that can accurately detect load current from 0-1A.  The corresponding linear output range is from 0V to 4.9V. This design relies on the LM7705 inverting charge pump to bias the negative supply of the OPA320 to -0.23V. This setup extends the linear output range of the amplifier below 0V.  The circuit's linear operation across the entire 0-1A input range enables calibrated performance to within ±0.003% error.

Features
  • 0 - 1 A Current Sense
  • 0 to 4.9 V Output
  • Single-Supply Solution
  • ±0.003% FSR Error (calibrated)
  • ±0.0002% Zero Scale Error (calibrated)
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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.

download Schematic — TIPD129
TIDC039.ZIP (759 K)

Detailed schematic diagram for design layout and components

download Schematic — TIPD129
TIDR323.PDF (76 K)

Detailed schematic diagram for design layout and components

download Bill of materials (BOM) — TIPD129
TIDR324.PDF (75 K)

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

download Gerber file — TIPD129
TIDC226.ZIP (266 K)

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

Products

Includes TI products in the design and potential alternatives.

AC/DC & DC/DC converters (integrated FET)

LM7705 — Low Noise Negative Bias Generator

Data sheet: PDF | HTML
Precision op amps (Vos<1mV)

OPA320 — Precision, zero-crossover, 20-MHz, 0.9-pA Ib, RRIO, CMOS operational amplifier

Data sheet: PDF | HTML

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Software

Technical documentation

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Type Title Date
* User guide 0-A to 1-A Single-Supply Low-Side Current-Sensing Solution Design Guide (Rev. B) Dec. 11, 2015

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