SBOA603 June 2024 INA700 , INA740A , INA740B , INA745A , INA745B , INA780A , INA780B
3.1 Total Error Comparison for Current ≤ 15A Over Temperature
For this data set, the EZShunt™ device selected is the INA700, which is characterized for 15A at 25°C, along with the INA234 and three separate resistor sets shown in Table 3-1
| Data Sheet | Measured | |||||||
|---|---|---|---|---|---|---|---|---|
| Resistor | Resistance (mΩ) | Tolerance | Drift (ppm) | Tolerance | Drift (ppm) | Wattage | Case Size | 1K price |
| A | 2 | 1% | 50 | 0.66% | 17.6 | 0.5W | 0805 | $0.081 |
| B | 2 | 1% | 150 | 0.44% | 56.7 | 0.5W | 1206 | $0.18 |
| C | 2 | 1% | 275 | 1.76% | 54.5 | 0.5W | 0603 | $0.63 |
The Benchmark data with our EZShunt™ against Discrete implementations with consecutive resistor sets are shown in Figure 3-1.
Figure 3-1 INA700 vs INA234 and Resistor A
Figure 3-2 INA700 vs INA234 and Resistor B
Figure 3-3 INA700 vs INA234 + Resistor CWhen comparing the total error for each design from 0A to 15A at 25°C and 125°C ambient field temperatures, we can determine the overall accuracy of the discrete design used in conjunction with either Resistor A, B, or C is far less in comparison to the INA700 at both temperature (25°C and 125°C) points throughout the data set regardless of current nor temperature. Thus, helps us infer, regardless of resistor type, or cost for use cases measuring below 15A, INA700 can offer the most accurate design for similar cost in the market.