SBAU461A May   2024  – November 2024 INA790A , INA790B , INA791A

 

  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
  13. 7Revision History

2.1.3 Configurable Gain

The INA790x features default gain 20mV/A. With an external adjustable gain resistor network, total gain (G) can range up to 400mV/A. Position 5 though 10 of header J3 allows the user to customize the adjustable gain, with two shorting jumpers B and C as shown in Figure 3-1. Configuration options provided by the EVM are shown in Table 2-1:

Table 2-1 Configurable Gain
J3 Positions of Jumpers B and C Output Amplifier Gain (V/V) System Gain (mV/A)
B removed; C at #6 1 20
B installed; C at #7 2 40
B installed; C at #8 3 60
B installed; C at #9 4 80
B installed; C at #10 5 100