SBOA603 June   2024 INA700 , INA740A , INA740B , INA745A , INA745B , INA780A , INA780B

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Design Size
  6. 3Performance and Functionality
    1. 3.1 Total Error Comparison for Current ≤ 15A Over Temperature
    2. 3.2 Total Error Comparison for Current ≤ 25A Over Temperature
      1. 3.2.1 Common Mode Voltage ≤ 40V
      2. 3.2.2 Common Mode Voltage ≤ 80V
    3. 3.3 Total Error Comparison for Current ≤ 50A Over Temperature
  7. 4Summary
  8. 5References

3.2 Total Error Comparison for Current ≤ 25A Over Temperature

For this data set, the EZShunt™ device selected is the INA745A, which is characterized for 35A at 25°C, along with the INA236 and three separate resistor sets shown below to support a common mode voltage of 40V. Meanwhile, the INA740A that is characterized for 35A at 25°C was also used against the INA238 to support 85V. Both designs were paired with the Table 3-2 resistor set:

Table 3-2 Resistors D, E, and F(≤ 25A)
Data sheetMeasured
ResistorResistance (mΩ)ToleranceDrift (ppm)ToleranceDrift (ppm)Wattage (W)Case Size1K price
D11%500.29%96.911206$0.161

E

11%500.99%118.222010/5025$0.314
F10.5%3000.2%95.222512$1.024