SLOU514 June   2021 INA254

 

  1.   Trademarks
  2. 1General Texas Instruments High Voltage Evaluation (TI HV EVM) User Safety Guidelines
  3. 2Overview
    1. 2.1 Kit Contents
    2. 2.2 Related Documentation From Texas Instruments
  4. 3Hardware
    1. 3.1 Theory of Operation
    2. 3.2 Features
    3. 3.3 Quick Start Setup
    4. 3.4 Current Input
  5. 4Schematics, PCB Layout, and Bill of Materials
    1. 4.1 Schematic
    2. 4.2 Layout
    3. 4.3 Bill of Material

3 Hardware

Each of the PCBs on the INA254EVM requires a 2.7-V to 5.5-V power supply connected between the VS and GND test points.

The INA254 family of devices have an integrated shunt of value 0.4 mΩ between the IS+ and IS– pins. Connect a current source and an optional load in series with test points IS+ and IS–. Use a voltmeter on the OUT test point to measure the voltage output of the INA254. Keep the voltage on the IS+ and IS- in the range of –4 V to +80 V at all times.

For the following components, x = 1 to 3, respective to the INA254A1, A2, or A3 devices.

Cx02 are supply bypass capacitors for the INA254Ax.

Rx01 is a 0-Ω resistor that ties SH+ to IN+.

Rx02 is a 0-Ω resistor that ties SH– to IN–.

Rx03 and Rx06 are 0-Ω resistors that tie REF1 and REF2 pins to VS and GND respectively, thereby creating a midsupply reference votlage.

Components Rx01, Rx02, Cx03, Cx04, and Cx05 can be added or replaced to provide optional filtering of the voltages out of the SH+ and SH– pins, and into the IN+ and IN– pins of the INA254.