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Isolated Busbar / SMD Current Sensor with Analog Output

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This reference design focuses on the current sensing solutions used in high voltage applications, in which an isolated current sensing circuit is a must.

The measured current goes through a low TCR shunt resistance - the WSBE and WSL are explored in this application. The voltage drop across the shunt resistance is fed to a high performance differential output isolated amplifier, which in this case is the VIA0050DD. The VIA0050DD has a linear differential range of ± 50 mV. The differential output voltage between OUT and OUT is ± 2.05 V. This differential output is converted to a single-ended output, providing an output in the range of 0 V to 2.5 V (OUT to GND), which is ready to be interfaced by a single-ended ADC or multimeter.

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This reference design focuses on the current sensing solutions used in high voltage applications, in which an isolated current sensing circuit is a must.

The measured current goes through a low TCR shunt resistance - the WSBE and WSL are explored in this application. The voltage drop across the shunt resistance is fed to a high performance differential output isolated amplifier, which in this case is the VIA0050DD. The VIA0050DD has a linear differential range of ± 50 mV. The differential output voltage between OUT and OUT is ± 2.05 V. This differential output is converted to a single-ended output, providing an output in the range of 0 V to 2.5 V (OUT to GND), which is ready to be interfaced by a single-ended ADC or multimeter.

Reference Design Files

Reference Board

Datasheet

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Reference

Functional Block Diagram

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Features

AC current measurement up to 1415 A

Maximum working isolation voltage of 1200 VRMS

Isolated single-ended analog output

Low temperature offset and gain drift

Bandwidth of approx. 280 kHz

Products

  • Resistor:WSBE

    Power Metal Strip® Shunt Resistor, Low TCR (Down to < ± 10 ppm/°C), Very Low Value (Down to 15 µΩ)

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