SGLS127B July   2002  – June 2025 TLC3702-EP

PRODUCTION DATA  

  1.   1
  2. 1Features
  3. 2Description
  4.   Pin Configuration and Functions
  5. 3Specifications
    1. 3.1 Absolute Maximum Ratings
    2. 3.2 Recommended Operating Conditions
    3. 3.3 Electrical Characteristics
    4. 3.4 Switching Characteristics
    5. 3.5 Typical Characteristics
  6. 4Detailed Description
    1. 4.1 Overview
    2. 4.2 Functional Block Diagrams
    3. 4.3 Feature Description
    4. 4.4 Device Functional Modes
      1. 4.4.1 Input
      2. 4.4.2 ESD Protection
      3. 4.4.3 Unused Inputs
      4. 4.4.4 Push-Pull Output
      5. 4.4.5 Hysteresis
        1. 4.4.5.1 Inverting Comparator With Hysteresis
        2. 4.4.5.2 Non-Inverting Comparator With Hysteresis
  7. 5Application and Implementation
    1. 5.1 Application Information
      1. 5.1.1 Basic Comparator Definitions
        1. 5.1.1.1 Operation
        2. 5.1.1.2 Propagation Delay
        3. 5.1.1.3 Overdrive and Underdrive Voltage
    2. 5.2 Typical Applications
      1. 5.2.1 Window Comparator
        1. 5.2.1.1 Design Requirements
        2. 5.2.1.2 Detailed Design Procedure
        3. 5.2.1.3 Application Curve
    3. 5.3 Power Supply Recommendations
    4. 5.4 Layout
      1. 5.4.1 Layout Guidelines
      2. 5.4.2 Layout Example
  8. 6Device and Documentation Support
    1. 6.1 Documentation Support
      1. 6.1.1 Related Documentation
    2. 6.2 Receiving Notification of Documentation Updates
    3. 6.3 Support Resources
    4. 6.4 Trademarks
    5. 6.5 Electrostatic Discharge Caution
    6. 6.6 Glossary
  9. 7Revision History
  10. 8Mechanical, Packaging, and Orderable Information

4.4.5 Hysteresis

The basic comparator configuration can oscillate or produce a noisy "chatter" output if the applied differential input voltage is near the comparator's offset voltage. This usually occurs when the input signal is moving very slowly across the switching threshold of the comparator.

This problem can be prevented by the addition of hysteresis or positive feedback.

The hysteresis transfer curve is shown in Figure 4-2. This curve is a function of three components: VTH, VOS, and VHYST:

  • VTH is the actual set voltage or threshold trip voltage.
  • VOS is the internal offset voltage between VIN+ and VIN–. This voltage is added to VTH to form the actual trip point at which the comparator must respond to change output states.
  • VHYST is the hysteresis (or trip window) that is designed to reduce comparator sensitivity to noise.

TLC3702-EP Hysteresis Transfer Curve
Figure 4-2 Hysteresis Transfer Curve

For more information, please see Application Note SBOA219 "Comparator with and without hysteresis circuit".