SLVS646B September   2006  – November 2018 TPS2376-H

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Typical Application Circuit
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
    1.     Pin Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 ESD Ratings IEC
    4. 7.4 Recommended Operating Conditions
    5. 7.5 Thermal Information
    6. 7.6 Electrical Characteristics
    7. 7.7 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Undervoltage Lockout (UVLO)
      2. 8.3.2 Programmable Inrush Current Limit and Fixed Operational Current Limit
      3. 8.3.3 Power Good
  9. 9 Application and Implementation
    1. 9.1 Application Information
      1. 9.1.1 Internal Thresholds
      2. 9.1.2 Detection
      3. 9.1.3 Classification
    2. 9.2 Typical Application
      1. 9.2.1 External Components
        1. 9.2.1.1 Detection Resistor and UVLO Divider
        2. 9.2.1.2 Magnetics
        3. 9.2.1.3 Input Diodes or Diode Bridges
        4. 9.2.1.4 Input Capacitor
        5. 9.2.1.5 Load Capacitor
        6. 9.2.1.6 Transient Suppressor
  10. 10Power Supply Recommendations
    1. 10.1 Maintain Power Signature
    2. 10.2 DC/DC Converter Startup
    3. 10.3 Auxiliary Power Source ORing
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
    3. 11.3 Thermal Protection
    4. 11.4 ESD
  12. 12Device and Documentation Support
    1. 12.1 Documentation Support
      1. 12.1.1 Related Documentation
    2. 12.2 Receiving Notification of Documentation Updates
    3. 12.3 Community Resources
    4. 12.4 Trademarks
    5. 12.5 Electrostatic Discharge Caution
    6. 12.6 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

9.1.1 Internal Thresholds

In order to implement the defined PoE functions shown in Figure 11, the TPS2376-H has a number of internal comparators with hysteresis for stable switching between the various states. Figure 12 relates the parameters in the Electrical Characteristics section to the PoE states. The mode labeled idle between classification and PD powered implies that the DET, CLASS, PG, and RTN pins are all high impedance.

TPS2376-H ai_thrs_volt_lvs570.gifFigure 12. Threshold Voltages