TIDUFK0 October   2026

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6. 1System Description
    1. 1.1 Key System Specifications
  7. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
      1. 2.2.1 Step-Down Converter Subsystem
      2. 2.2.2 Digital-to-Analog Control Set Path
      3. 2.2.3 High-Precision Measurement Front-End (Feedback Path)
    3. 2.3 Highlighted Products
      1. 2.3.1 TPSM8F7x20
      2. 2.3.2 ADS9308V8I
      3. 2.3.3 TMDSCNCD28P65X
      4. 2.3.4 DAC80504
      5. 2.3.5 REF50
      6. 2.3.6 OPAx990
  8. 3System Design Theory
    1. 3.1 Converter Step Down Range
    2. 3.2 Fault Clamping Protection
    3. 3.3 Current Clamping Behavior
  9. 4Hardware, Software, Testing Requirements, and Test Results
    1. 4.1 Hardware Requirements
    2. 4.2 Software
    3. 4.3 Test Setup
    4. 4.4 Test Results
      1. 4.4.1 Voltage Linearity test
      2. 4.4.2 Voltage Regulation Test
      3. 4.4.3 Current Linearity Test
      4. 4.4.4 Output Voltage Ripple
      5. 4.4.5 Full Load Transient Response
      6. 4.4.6 Sudden Load Switch In with Current Clamping Response
      7. 4.4.7 Full Load Voltage Settling Time
  10. 5Design and Documentation Support
    1. 5.1 Tools and Software
      1. 5.1.1 Tools
      2. 5.1.2 Software
    2. 5.2 Documentation Support
    3. 5.3 Support Resources
    4.     Trademarks
  11. 6About the Author

2.3.6 OPAx990

The OPAx990 high voltage (40V) general purpose operational amplifiers, is used for general purpose clamp for buck converters. These devices offer excellent DC precision and AC performance, including rail-to-rail input/output, low offset (±300µV, typ), and low offset drift (±0.6µV/°C, typ)

The device features:

  • Wide bandwidth: 1.1MHz GBW
  • MUX-friendly/comparator inputs
  • High common-mode rejection: 115dB
  • Low bias current: ±10pA
  • High slew rate: 4.5V/µs