SLVS798G January   2008  – June 2024 TPS2062A , TPS2066A

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 Recommended Operating Conditions
    3. 5.3 Thermal Information
    4. 5.4 Electrical Characteristics
    5. 5.5 Typical Characteristics
  7. 6 Parameter Measurement Information
    1.     13
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Overcurrent
      1. 7.3.1 Overcurrent Conditions (TPS2062ADRB, TPS2066ADRB, and TPS2066AD)
      2. 7.3.2 Overcurrent Conditions (TPS2062AD)
    4. 7.4 OCx Response
    5. 7.5 Undervoltage Lockout (UVLO)
    6. 7.6 Enable ( ENx or ENx)
    7. 7.7 Thermal Sense
  9. 8 Application Information
    1. 8.1 Power-Supply Considerations
    2. 8.2 Input and Output Capacitance
    3. 8.3 Power Dissipation and Junction Temperature
    4. 8.4 Universal Serial Bus (USB) Applications
    5. 8.5 Self-powered and Bus-Powered Hubs
    6. 8.6 Low-Power Bus-Powered And High-Power Bus-Powered Functions
    7. 8.7 USB Power-Distribution Requirements
  10. 9 Device and Documentation Support
    1. 9.1 Receiving Notification of Documentation Updates
    2. 9.2 Support Resources
    3. 9.3 Trademarks
    4. 9.4 Electrostatic Discharge Caution
    5. 9.5 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

7.3 Overcurrent

A sense FET is employed to check for overcurrent conditions. Unlike current-sense resistors, sense FETs do not increase the series resistance of the current path. When an overcurrent condition is detected, the device maintains a constant output current and reduces the output voltage accordingly. Complete shutdown occurs only if the fault is present long enough to activate thermal limiting.

There are two kinds of current limit profiles for the TPS206xA devices.

The TPS2062ADRB, TPS2066ADRB, and TPS2066AD have an output I vs V characteristic similar to the plot labeled Current Limit with Peaking in Figure 7-1. This type of limiting can be characterized by two parameters, the overcurrent trip threshold (IOC), and the short-circuit output current threshold (IOS).

The TPS2062AD has an output I vs V characteristic similar to the plot labeled Flat Current Limit in Figure 7-1. This type of limiting can be characterized by one parameters, the short circuit current (IOS).

TPS2062A TPS2066A Current Limit Profiles Figure 7-1 Current Limit Profiles