SBOU279A March   2022  – November 2022 INA241A , INA241B

 

  1.    INA241EVM Abstract
  2.   Trademarks
  3. 1General Texas Instruments High Voltage Evaluation (TI HV EVM) User Safety Guidelines
  4. 2Overview
    1. 2.1 EVM Kit Contents
    2. 2.2 Related Documentation From Texas Instruments
  5. 3Hardware
    1. 3.1 Features
  6. 4Operation
    1. 4.1 Quick Start Setup
    2. 4.2 Measurements
  7. 5EVM Components
    1. 5.1 R1_n, R2_n, R3_n, C2_n, C5_n
    2. 5.2 C1_n
    3. 5.3 R4_n
    4. 5.4 U1_n (INA241x)
  8. 6Schematic, PCB Layout, and Bill of Materials
    1. 6.1 Schematic
    2. 6.2 PCB Layout
    3. 6.3 Bill of Materials
  9. 7Revision History

4.2 Measurements

The user can either emulate the voltage developed across a sense resistor based on a given set of system conditions with the INA241EVM, or connect the device inputs to an external shunt. The user can also solder a surface-mount technology (SMT) shunt resistor across the In+ and In– pads, and these inputs can be connected in series with the external system and load.

To configure a measurement evaluation without a shunt resistor, follow this procedure:

  1. Connect a differential voltage across the In+ (J1_n) and In– (J2_n) tabs.
  2. Connect a 2.7-V to 110-V common-mode voltage to the inputs if the differential voltage supply is a floating supply. Connect the positive lead of the external voltage source to the In– (J1_n) tab and source ground to a GND test point. The minimum common-mode voltage should be > -4V. This action effectively raises the absolute common-mode voltage of the input pins.
  3. Measure the output voltage at the Vout test point with respect to GND.

To configure a measurement evaluation with a shunt resistor, follow this procedure:

  1. Solder a 2512 resistor at the R1_n pads that connects the In+ (J1_n) and In– (J1_n) inputs.
  2. Connect the In+ (J1_n) and In– (J2_n) tabs in series with the load and bus voltage sources while powered off.
    WARNING:

    Make sure that the equipment (shunt resistor, wires, connectors, and so on) can support the amperage and power dissipation first before you measure the current. Also make sure that the current flowing through J1 does not exceed 10 A. Failure to do so can result in hot surfaces (> 55°C), damage to the EVM, or personal injury.

  3. Power on the system and measure the output voltage at the Vout test point. Vout is equal to the gain of the device multiplied by the differential voltage measured directly at the device input pins. If bidirectional, use voltage is referenced to VS/2. If unidirectional, the ouput is refrenced to voltage applied at Ref1 and Ref2.