SBOU268 November   2021 OPA593

 

  1.   Trademarks
  2. 1Overview
    1. 1.1 Getting Started
      1. 1.1.1 Related Documentation From Texas Instruments
    2. 1.2 High-Voltage Warning and Safe Use
    3. 1.3 Electrostatic Discharge Caution
  3. 2Operation
    1. 2.1 Jumper Blocks, Jacks, and Test Points
    2. 2.2 Inputs
    3. 2.3 Outputs
    4. 2.4 Enable or Disable
    5. 2.5 Status Flags
      1. 2.5.1 Circuit Protection
  4. 3Application Circuits
    1. 3.1 Setting Dual-Supply or Single-Supply Operation
      1. 3.1.1 Dual-Supply Operation Configuration
      2. 3.1.2 Single-Supply Operation Configuration
    2. 3.2 Common Op-Amp Configurations
      1. 3.2.1 Inverting Gain of –10 V/V
        1. 3.2.1.1 External Connections for –10 V/V Inverting Gain Configuration
        2. 3.2.1.2 Inverting Gain of –10 V/V Configuration Electrical Performance
      2. 3.2.2 Noninverting Gain of +2 V/V
        1. 3.2.2.1 External Connections to OPA593EVM for Noninverting Gain Configuration
        2. 3.2.2.2 Noninverting Gain Configuration Electrical Performance
      3. 3.2.3 Gain of +10 V/V Difference Amplifier
        1. 3.2.3.1 Jumper Shunt Locations for Difference-Amplifier Configuration
        2. 3.2.3.2 Gain of 10 V/V Difference Amplifier Configuration Electrical Performance
      4. 3.2.4 Improved Howland Current Pump
        1. 3.2.4.1 Jumper Shunt Locations for Improved Howland Current Pump Configuration
  5. 4Schematic, PCB Layout, and Bill of Materials
    1. 4.1 EVM Schematic
      1. 4.1.1 EVM Default Configuration
    2. 4.2 PCB Layout
    3. 4.3 Bill of Materials

2.5 Status Flags

The OPA593 DNT (12-pin WSON) package provides separate current limit and thermal shutdown flag functions that indicate when an overcurrent or overtemperature condition occurs. These two functions have pins that are open-drain, active-low outputs, internally referenced to the applied E/D Com pin voltage; E/D Com is shown as EDcom on the EVM board. An LED and series 820-Ω resistor serve as the pulldown load for each status flag pin to the E/D Com pin (EDcom). The OPA593EVM has a separate 3.3-V regulator that is referenced to E/D Com pin (E/D com) and serves as the supply in this circuit.

An LED illuminates when an overcurrent or overtemperature condition is reached. An orange overcurrent LED illuminates when the output current exceeds the limit selected by the jumper shunt connected across one of the JP12 through JP16, 50-mA to 250-mA current-limit selections. The red overtemperature LED activates if the OPA593 junction temperature (TJ) is greater than 150°C, but turns off after the device cools to 130°C. The OPA593EVM has an extensive heat-sinking area; therefore, triggering the overtemperature LED may be difficult. The status flag pins can be monitored externally using the TP9 current-limit test point and TP8 thermal-limit test point.