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- TIPD104 Design Reference Guide
(PDF 360 KB)
19 Sep 2013 2,439 views
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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- Senses current from 10uA-10mA
- Less than 0.1 % Error
- Outputs 100mV to 4.9V
- Single-Supply Solution
- Low-Side Measurement
- Unique gain-switching network
- Utilizes INA326 RRI/O Instrumentation Amplifier
- Component Selection
- TINA-TI Simulation
- Modification Options