SLVSB99C March   2012  – July 2015 TPS2378

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  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
    5. 6.5 Electrical Characteristics
    6. 6.6 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  APD Auxiliary Power Detect
      2. 7.3.2  CDB Converter Disable Bar Pin Interface
      3. 7.3.3  CLS Classification
      4. 7.3.4  DEN Detection and Enable
      5. 7.3.5  Internal Pass MOSFET
      6. 7.3.6  T2P Type-2 PSE Indicator
      7. 7.3.7  VDD Supply Voltage
      8. 7.3.8  VSS
      9. 7.3.9  PowerPAD
      10. 7.3.10 Forced, Four-Pair, High Power PoE
    4. 7.4 Device Functional Modes
      1. 7.4.1  PoE Overview
      2. 7.4.2  Threshold Voltages
      3. 7.4.3  PoE Start-up Sequence
      4. 7.4.4  Detection
      5. 7.4.5  Hardware Classification
      6. 7.4.6  Inrush and Start-up
      7. 7.4.7  Maintain Power Signature
      8. 7.4.8  Start-up and Converter Operation
      9. 7.4.9  PD Hotswap Operation
      10. 7.4.10 Start-up and Power Management, CDB and T2P
      11. 7.4.11 Adapter ORing
      12. 7.4.12 Using DEN to Disable PoE
      13. 7.4.13 ORing Challenges
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Requirements
        1. 8.2.2.1 Input Bridges and Schottky Diodes
        2. 8.2.2.2 Protection, D1
        3. 8.2.2.3 Capacitor, C1
        4. 8.2.2.4 Detection Resistor, RDEN
        5. 8.2.2.5 Classification Resistor, RCLS
        6. 8.2.2.6 APD Pin Divider Network RAPD1, RAPD2
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
    3. 10.3 EMI Containment
    4. 10.4 Thermal Considerations and OTSD
    5. 10.5 ESD
  11. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 Community Resources
    3. 11.3 Trademarks
    4. 11.4 Electrostatic Discharge Caution
    5. 11.5 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

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

9 Power Supply Recommendations

The TPS2378 device will typically be followed by a power supply such as an isolated flyback or active clamp forward converter or a non-isolated buck converter. The input voltage of the converter should be capable of operating within the IEEE802.3at recommended input voltage as shown in Table 2.