SBAU461 May   2024 INA790B , INA791B

 

  1.   1
  2.   Description
  3.   Get Started
  4.   Features
  5.   Applications
  6.   6
  7. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
    5. 1.5 General Texas Instruments High Voltage Evaluation (TI HV EVM) User Safety Guidelines
  8. 2Hardware
    1. 2.1 Circuitry
      1. 2.1.1 Bypass Capacitors
      2. 2.1.2 Output Filter
      3. 2.1.3 Configurable Gain
      4. 2.1.4 Configurable Reference Voltage
      5. 2.1.5 Thermal Alert Function
      6. 2.1.6 Load Connectors
      7. 2.1.7 INA79x Current-Sense Amplifier
  9. 3Implementation Results
    1. 3.1 Operation
      1. 3.1.1 Measurements
      2. 3.1.2 Advanced Measurement Tips
  10. 4Hardware Design Files
    1. 4.1 Schematics
    2. 4.2 PCB Layout
    3. 4.3 Bill of Materials
  11. 5Additional Information
    1. 5.1 Trademarks
  12. 6Related Documentation From Texas Instruments

2.1.4 Configurable Reference Voltage

The INA790x output is configurable to allow for unidirectional or bidirectional operation. The output voltage is set by applying a voltage from an external reference at REF pin. The voltage at REF pin can range between supply and GND. For symmetric bidirectional current sensing REF is set at mid-supply.

Equation 1. V O U T = G × I S H U N T + V R E F

Positions 1 though 3 of header J3 allow the user to customize the REF pin voltage, VREF, with shorting jumper A as shown in Figure 4-1. When using external reference, the voltage source can be connected through J6 or TP4. Configuration options provided by the EVM are shown in Table 3-2.

Table 2-2 Configurable Reference
J3 Position of Jumper A VREF (V)
#1 User Provided
#2 0
#3 VS