SBOU284 april   2023 INA310A , INA310B

 

  1.   SBOU284 Abstract
  2.   Trademarks
  3.   General Texas Instruments High Voltage Evaluation (TI HV EVM) User Safety Guidelines
  4. 1Overview
    1. 1.1 Kit Contents
    2. 1.2 Related Documentation From Texas Instruments
  5. 2Hardware
    1. 2.1 Features
  6. 3Operation
    1. 3.1 Quick Start Setup
    2. 3.2 Measurements
      1. 3.2.1 Detailed Setup
    3. 3.3 Comparator
  7. 4Circuitry
    1. 4.1 Current Sensing IC
    2. 4.2 Input Signal Path
    3. 4.3 Device Output and Comparator
  8. 5Schematics, PCB Layout, and Bill of Materials
    1. 5.1 Schematics
    2. 5.2 PCB Layout
    3. 5.3 Bill of Materials

1 Overview

The INA310x is an ultra-precise current sense amplifier that can measure voltage drops across shunt resistors over a wide common-mode range from –4 V to 110 V, independent of supply voltage with an integrated comparator. The high precision current measurement accuracy is achieved through a combination of low offset voltage (20 µV, maximum), small gain error (0.15%, maximum) and a high DC CMRR (160 dB, typical). The INA310x has a high signal bandwidth of 1.3 MHz designed for high voltage DC current measurements and high-speed applications like fast overcurrent protection.

The INA310x incorporates an open-drain comparator and internal reference that provides a 0.6-V threshold. An external resistive divider sets the current trip point. The comparator includes a latching capability that can be made transparent by grounding (or leaving open) the RESET pin.

The INA310x operates from a single 2.7-V to 20-V supply and draws 1.6 mA of supply current. The INA310x is available in five gain options: 20 V/V, 50 V/V, 100 V/V, 200 V/V, and 500 V/V. These gain options address a wide dynamic range of current-sensing applications.

The INA310x is specified over an operating temperature range of −40°C to +125°C and is offered in a space-saving 8-pin VSSOP package.

Table 1-1 Device Summary
EVM ORDERABLEPRODUCTGAINMAX GAIN ERRORMAX OFFSET VOLTAGE
INA310AEVMINA310A120 V/V0.15%±20 µV
INA310A250 V/V
INA310A3100 V/V
INA310A4200 V/V
INA310A5500 V/V
INA310BEVMINA310B120 V/V0.5%±150 µV
INA310B250 V/V
INA310B3100 V/V
INA310B4200 V/V
INA310B5500 V/V