Low Side, High Bandwidth Current Amp and Fault Detection for Solar Inverters Reference Design


Design files


This reference design provides a solution for an accurate shunt-based current measurement on the low side with an integrated fault-detection feature. It consists of a current sense amplifier which supports current sensing for a high bandwidth. The fault detection feature allows detection of undercurrent and overcurrent faults. The design provides a performance comparison between shunt-based current sensing and current sensing using a hall sensor.

  • Shunt based low side current sensing system with negative common mode support
  • Compact system for current sensing
  • High bandwidth current sensing of up to 400kHz
  • Bidirectional current sensing support
  • Integrated undercurrent and overcurrent detection with less than 1µs response time
  • Less than 0.3% error in measurement for complete DC current range (-3A to 15A)
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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.

TIDUE85.PDF (1328 K)

Reference design overview and verified performance test data


Detailed schematic diagram for design layout and components


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


Detailed overview of design layout for component placement

TIDRWO8.ZIP (2167 K)

Files used for 3D models or 2D drawings of IC components


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


PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.


LMV393-NDual General Purpose, Low Voltage, Tiny Pack Comparator

Data sheet: PDF | HTML
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INA240-4 to 80V, bidirectional, ultra-precise current sense amplifier with enhanced PWM rejection

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Linear & low-dropout (LDO) regulators

LP2985150-mA, 16-V, low-dropout voltage regulator with enable

Data sheet: PDF | HTML
Linear & low-dropout (LDO) regulators

TLV760100-mA, 30-V, low-dropout voltage regulator

Data sheet: PDF | HTML
Linear & low-dropout (LDO) regulators

TPS717150-mA, high-PSRR, low-IQ, low-dropout voltage regulator with enable

Data sheet: PDF | HTML
Noninverting buffers & drivers

SN74LVC1G17Single 1.65-V to 5.5-V buffer with Schmitt-Trigger inputs

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

OPA350Single, single-supply, rail-to-rail, high speed, low noise operational amplifier

Data sheet: PDF | HTML
Shunt voltage references

TLV431B0.5% accuracy, low-voltage, adjustable precision shunt regulator

Data sheet: PDF | HTML

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Design tools & simulation

Simulation model

TIDA-01598 Simulation — TIDM036.ZIP (17 K)

Technical documentation

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Type Title Date
* Design guide Reference Design for Low-Side, High-Bandwidth Current Amp and Error Detection Jul. 10, 2018

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