4 Summary

By comparing EZShunt™ designs with Digital power monitors providing similar performance and cost in accordance with a variety of shunt resistors providing a range of accuracies, we are able to understand whether our EZShunt™ is indeed comparable or better than discrete traditional designs across current and temperature.

In terms of shunt resistors, regardless of how the resistors perform when measured, the recommendation is to design based on data sheet parameters. Therefore, some measured specifications can be higher or lower than data sheet values. In addition, all Digital Power Monitors used to compare against relative EZShunt™ devices were chosen on the basis of similar price point, accuracy, and functionality.

When considering a current range up to 15A over temperature, we used our INA700 capable of supporting 15A at 25°C against the INA234 with Resistor A, B, and C. The data retrieved from all three resistor groups provides clear and compelling evidence that EZShunt™ technology provides significantly higher accuracy, and less error across current at 25°C and 125°C.

In the current range up to 25A over temperature, we used our INA745A and INA740A capable of supporting 35A at 25°C and 40V/85V of common mode voltage respectively against the INA236 with Resistor D, E, and F. The data helps us understand EZShunt™ technology can have higher accuracy across current from approximately 0.7A to 25A at 125°C. Meanwhile, the discrete design can be more accurate and posses less error at 25°C depending on the measured accuracy of the resistor. However, if a design is based on data sheet typical parameters of 1% tolerance and 50ppm, EZShunt™ can provide higher precision and less total error than the discrete design.

In the current range up to 50A over temperature, we used our INA780A capable of supporting 75A at 25°C against the INA238 with Resistor G, H, and I. The data shows the discrete design can perform better with higher accuracy and less total error with shunt resistors providing tolerance below 0.5% and drift of 50ppm. However, if a design is based on data sheet typical parameters of 1% tolerance and 50ppm, EZShunt™ technology can have higher precision and lower total error from 1A to 50A at both 25°C and 125°C compared to the discrete design.