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10uA-100mA, 0.05% Error, High-Side Current Sensing Solution Reference Design
(ACTIVE) TIPD135
View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.
Key Document
- 10-uA to 100-mA 0.05%-Error High-Side Current Sensing Design Guide
(PDF 976 KB)
03 Oct 2013
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TIPD135 Design File
(ZIP 3467 KB)
03 Oct 2013
Description
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
- Theory
- Component Selection
- TINA-TI Simulation
- Schematics and PCB Layout
- Verification and Measured Performance
- Modification Options
This Verified Design Includes:
View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.
