Current amp and fault detection for solar inverters ref. design

14th September 2018
Enaie Azambuja

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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