SLVSDW2A Dec   2018  – January 2019 TPS23755

PRODUCTION DATA.  

  1. Features
  2. Applications
  3. Description
    1.     Device Images
      1. 3.1 Simplified Application
      2. 3.2 Efficiency Vs. Load Current, 12 V Output
  4. Revision History
  5. Product Information
  6. Pin Configuration and Functions
    1.     Pin Functions
  7. Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics: DC-DC Controller Section
    6. 7.6 Electrical Characteristics: PoE and Control
    7. 7.7 Typical Characteristics
  8. Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1  CLS Classification
      2. 8.3.2  DEN Detection and Enable
      3. 8.3.3  Internal Pass MOSFET
      4. 8.3.4  DC-DC Controller Features
        1. 8.3.4.1 VCC, VB and Advanced PWM Startup
        2. 8.3.4.2 CS, Current Slope Compensation and blanking
        3. 8.3.4.3 COMP, FB, CP and Opto-less Feedback
        4. 8.3.4.4 FRS Frequency Setting and Synchronization
        5. 8.3.4.5 Frequency Dithering for Spread Spectrum Applications
        6. 8.3.4.6 SST and Soft-Start of the Switcher
        7. 8.3.4.7 AUX_V, AUX_D and Secondary Adapter Or'ing
      5. 8.3.5  Internal Switching FET - DRAIN, RSNS, SRF and SRR
      6. 8.3.6  VPD Supply Voltage
      7. 8.3.7  VDD Supply Voltage
      8. 8.3.8  GND
      9. 8.3.9  VSS
      10. 8.3.10 Exposed Thermal PAD
    4. 8.4 Device Functional Modes
      1. 8.4.1 PoE Overview
      2. 8.4.2 Threshold Voltages
      3. 8.4.3 PoE Start-Up Sequence
      4. 8.4.4 Detection
      5. 8.4.5 Hardware Classification
      6. 8.4.6 Maintain Power Signature (MPS)
      7. 8.4.7 Start-Up and Converter Operation
      8. 8.4.8 PD Self-Protection
      9. 8.4.9 Adapter ORing
  9. Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1  Input Bridges and Schottky Diodes
        2. 9.2.2.2  Protection, D1
        3. 9.2.2.3  Capacitor, C1
        4. 9.2.2.4  Detection Resistor, RDEN
        5. 9.2.2.5  Classification Resistor, RCLS
        6. 9.2.2.6  Bulk Capacitance, CBULK
        7. 9.2.2.7  Output Voltage Feedback Divider, RAUX, R1,R2
        8. 9.2.2.8  Setting Frequency, RFRS
        9. 9.2.2.9  Frequency Dithering, RDTR and CDTR
        10. 9.2.2.10 Transformer design, T1
        11. 9.2.2.11 Current Sense Resistor, RCS
        12. 9.2.2.12 Current Slope Compensation, RS
        13. 9.2.2.13 Bias Supply Requirements, CCC, DCC
        14. 9.2.2.14 Switching Transformer Considerations, RVCC and CCC2
        15. 9.2.2.15 Primary FET Clamping, RCL, CCL, and DCL
        16. 9.2.2.16 Converter output capacitance, COUT
        17. 9.2.2.17 Secondary Output Diode Rectifier, DOUT
        18. 9.2.2.18 Slew rate control, RSRF and RSRR
        19. 9.2.2.19 Shutdown at Low Temperatures, DVDD and CVDD
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Documentation Support
      1. 12.1.1 Related Documentation
    2. 12.2 Community Resource
    3. 12.3 Trademarks
    4. 12.4 Electrostatic Discharge Caution
    5. 12.5 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
  • RJJ|23
Thermal pad, mechanical data (Package|Pins)
Orderable Information

Features

  • Complete IEEE 802.3at PD Solution for Type 1 PoE
    • Ethernet Alliance (EA) Logo Certified Designs Available
    • Robust 100-V, 0.36-Ω (typ) Hotswap MOSFET
    • Programmable Classification Level
  • Integrated PWM Controller with 0.77-Ω (typ) 150-V Power MOSFET
    • Flyback Controller with PSR
      • Supports CCM Operation with Secondary Side Diode Rectifier
      • ±3% (typ, 12-V Output) Load Regulation (5%-100% range)
    • Supports Low-side Switch Buck Topology
    • Adjustable Switching Frequency with Synchronization
    • Advanced Startup
    • Programmable Slew Rate and Frequency Dithering for Enhanced EMI Reduction
  • Secondary Side Adapter Priority Control with Smooth Transition
  • –40°C to 125°C Junction Temperature Range
  • Small 6-mm x 4-mm VSON Package