SBOU244 June   2020 INA281

 

  1.   INA281EVM
    1.     Trademarks
    2. 1 General Texas Instruments High Voltage Evaluation (TI HV EVM) User Safety Guidelines
    3. 2 Overview
      1. 2.1 EVM Kit Contents
      2. 2.2 Related Documentation From Texas Instruments
    4. 3 Hardware
      1. 3.1 Features
    5. 4 Operation
      1. 4.1 Quick Start Setup
      2. 4.2 Measurements
    6. 5 EVM Components
      1. 5.1 R2_Xn, R3_Xn, R4_Xn, C2_Xn, C3_Xn
      2. 5.2 C1_Xn
      3. 5.3 R1_Xn
      4. 5.4 U1_Xn (INA281)
    7. 6 Schematic, PCB Layout, and Bill of Materials
      1. 6.1 Schematics
      2. 6.2 PCB Layout
      3. 6.3 Bill of Materials
        1. 6.3.1 Bill of Materials

2 Overview

The INA281 device is a voltage-output, high-side and low-side measurement, current sense amplifier with an enable pin in a very-small SOT-23 package. As shown in Table 1, the INA281 has gains that range from 20 V/V to 500 V/V, depending on the gain option selected. The voltage developed across the device inputs is amplified by the corresponding gain of the specific device, and is presented at the output pin. The device accurately senses voltage drops across shunts at common-mode voltages from –4 V to +110 V, independent of supply voltages. The device survives common-mode voltages from –20 V to +120 V. The device operates with supply voltages between 2.7 V and 20 V, and draws a typical of 1.7 mA at room temperature.

Table 1. INA281 Gain Option Summary

Product Gain (V/V)
INA281A1 and INA281B1 20
INA281A2 and INA281B2 50
INA281A3 and INA281B3 100
INA281A4 and INA281B4 200
INA281A5 and INA281B5 500