This TI Reference Design provides the theory, component selection, and simulation of a single-supply, precision low-side current sensing solution that can accurately detect load currents from 10uA-10mA. The corresponding linear output is from 100mV to 4.9V. While traditional op amps can be used for such an application, the INA326 instrumentation amplifier enables a differential measurement and minimizes errors due to PCB parasitic. The INA326 can be used in low-side current sensing because the unique internal circuit topology allows for linear rail-to-rail input and output operation. A unique yet simple gain switching network was implemented in order to realize the wide load current range.
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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.
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Detailed schematic diagram for design layout and components
Detailed schematic diagram for design layout and components
Complete listing of design components, reference designators, and manufacturers/part numbers
Includes TI products in the design and potential alternatives.
| Type | Title | Date | |
|---|---|---|---|
| * | User guide | TIPD104 Design Reference Guide | Sep. 19, 2013 |
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