SBOU326 February   2025 INA187 , INA299

 

  1.   1
  2. 1Description
  3. 2Features
  4.   4
  5. 3Evaluation Module Overview
    1. 3.1 Introduction
    2. 3.2 Kit Contents
    3. 3.3 Specification
    4. 3.4 Device Information
  6. 4Hardware
    1. 4.1 Setup
      1. 4.1.1 Quick Start Setup
      2. 4.1.2 Measurements
    2. 4.2 Circuitry
      1. 4.2.1 R1_n, R2_n, R3_n, C2_n, C5_n
      2. 4.2.2 C1_n
      3. 4.2.3 R4_n
      4. 4.2.4 U1_n
    3. 4.3 General Texas Instruments High Voltage Evaluation (TI HV EVM) User Safety Guidelines
  7. 5Hardware Design Files
    1. 5.1 Schematics
    2. 5.2 PCB Layout
    3. 5.3 Bill of Materials
  8. 6Additional Information
    1. 6.1 Trademarks
  9. 7Related Documentation

4.1.2 Measurements

The user can either emulate the voltage developed across a sense resistor based on a given set of system conditions with the INA187EVM and INA299EVM, 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 2.7V to 42V (if using INA187EVM) or 2.7V to 80V (if using INA299EVM) common-mode voltage to the inputs given 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 must be less than –2V. 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 R4_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 10A. 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. The output is referenced to the voltage applied at REF.