SBOS556D June   2011  – August 2020 OPA171-Q1 , OPA2171-Q1 , OPA4171-Q1

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
    1.     Pin Functions : OPA171-Q1 and OPA2171-Q1
    2.     Pin Functions : OPA4171-Q1
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information — OPA171-Q1 and OPA2171-Q1
    5. 6.5 Thermal Information — OPA4171-Q1
    6. 6.6 Electrical Characteristics
    7. 6.7 Typical Characteristics
      1. 6.7.1 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Operating Characteristics
      2. 7.3.2 Phase-Reversal Protection
      3. 7.3.3 Capacitive Load and Stability
    4. 7.4 Device Functional Modes
      1. 7.4.1 Common-Mode Voltage Range
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Electrical Overstress
    2. 8.2 Typical Application
      1. 8.2.1 Capacitive Load Drive Solution Using an Isolation Resistor
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
        3. 8.2.1.3 Application Curve
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 Related Links
    3. 11.3 Receiving Notification of Documentation Updates
    4. 11.4 Support Resources
    5. 11.5 Trademarks
    6. 11.6 Electrostatic Discharge Caution
    7. 11.7 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

7.3.3 Capacitive Load and Stability

The dynamic characteristics of the OPAx171-Q1 family of devices are optimized for commonly encountered operating conditions. The combination of low closed-loop gain and high capacitive loads decreases the phase margin of the amplifier and can lead to gain peaking or oscillations. As a result, heavier capacitive loads must be isolated from the output. The simplest way to achieve this isolation is to add a small resistor (for example, ROUT equal to 50 Ω) in series with the output. Figure 7-2 and Figure 7-3 shows small-signal overshoot versus capacitive load for several values of ROUT. For details of analysis techniques and application circuits, see Applications Bulletin AB-028, available for download from TI.com.

GUID-CA2B534F-CE92-4CC8-8AF3-44E1FD5BBF06-low.gifFigure 7-2 Small-Signal Overshoot versus Capacitive Load (100-mV Output Step)
GUID-ACC08A53-E947-4B0F-B189-CF83A556A9AE-low.gifFigure 7-3 Small-Signal Overshoot versus Capacitive Load (100-mV Output Step)