JAJSEO7I October   2008  – December 2017 TPS23754 , TPS23754-1 , TPS23756

PRODUCTION DATA.  

  1. 1 特長
  2. 2 アプリケーション
  3. 3 概要
    1.     Device Images
      1.      TPS23754を使用する高効率コンバータ
  4. 4 改訂履歴
  5. 5 概要（続き）
  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 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Electrical Characteristics: PoE and Control
    7. 7.7 Switching Characteristics
    8. 7.8 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  APD
      2. 8.3.2  BLNK
      3. 8.3.3  CLS
      4. 8.3.4  Current Sense (CS)
      5. 8.3.5  Control (CTL)
      6. 8.3.6  Detection and Enable (DEN)
      7. 8.3.7  DT
      8. 8.3.8  Frequency and Synchronization (FRS)
      9. 8.3.9  GATE
      10. 8.3.10 GAT2
      11. 8.3.11 PPD
      12. 8.3.12 RTN, ARTN, COM
      13. 8.3.13 T2P
      14. 8.3.14 VB
      15. 8.3.15 VC
      16. 8.3.16 VDD
      17. 8.3.17 VDD1
      18. 8.3.18 VSS
      19. 8.3.19 PowerPAD
    4. 8.4 Device Functional Modes
      1. 8.4.1 PoE Overview
        1. 8.4.1.1  Threshold Voltages
        2. 8.4.1.2  PoE Start-Up Sequence
        3. 8.4.1.3  Detection
        4. 8.4.1.4  Hardware Classification
        5. 8.4.1.5  Inrush and Start-Up
        6. 8.4.1.6  Maintain Power Signature
        7. 8.4.1.7  Start-Up and Converter Operation
        8. 8.4.1.8  PD Hotswap Operation
        9. 8.4.1.9  Converter Controller Features
        10. 8.4.1.10 Bootstrap Topology
        11. 8.4.1.11 Current Slope Compensation and Current Limit
        12. 8.4.1.12 Blanking – RBLNK
        13. 8.4.1.13 Dead Time
        14. 8.4.1.14 FRS and Synchronization
        15. 8.4.1.15 T2P, Start-Up, and Power Management
        16. 8.4.1.16 Thermal Shutdown
        17. 8.4.1.17 Adapter ORing
        18. 8.4.1.18 PPD ORing Features
        19. 8.4.1.19 Using DEN to Disable PoE
        20. 8.4.1.20 ORing Challenges
  9. 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  Dead Time Resistor, RDT
        7. 9.2.2.7  Switching Transformer Considerations and RVC
        8. 9.2.2.8  Special Switching MOSFET Considerations
        9. 9.2.2.9  Thermal Considerations and OTSD
        10. 9.2.2.10 APD Pin Divider Network, RAPD1, RAPD2
        11. 9.2.2.11 PPD Pin Divider Network, RPPD1, RPPD2
        12. 9.2.2.12 Setting Frequency (RFRS) and Synchronization
        13. 9.2.2.13 Current Slope Compensation
        14. 9.2.2.14 Blanking Period, RBLNK
        15. 9.2.2.15 Estimating Bias Supply Requirements and CVC
        16. 9.2.2.16 T2P Pin Interface
        17. 9.2.2.17 Advanced ORing Techniques
        18. 9.2.2.18 Soft Start
        19. 9.2.2.19 Frequency Dithering for Conducted Emissions Control
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
    3. 11.3 ESD
  12. 12デバイスおよびドキュメントのサポート
    1. 12.1 ドキュメントのサポート
      1. 12.1.1 関連資料
    2. 12.2 コミュニティ・リソース
    3. 12.3 商標
    4. 12.4 静電気放電に関する注意事項
    5. 12.5 Glossary
  13. 13メカニカル、パッケージ、および注文情報

パッケージ・オプション

デバイスごとのパッケージ図は、PDF版データシートをご参照ください。

メカニカル・データ（パッケージ｜ピン）
  • PWP|20
サーマルパッド・メカニカル・データ
発注情報

8.3.3 CLS

A resistor from CLS to VSS programs the classification current per the IEEE standard. The PD power ranges and corresponding resistor values are listed in Table 1. The power assigned should correspond to the maximum average power drawn by the PD during operation.

High-power PSEs may perform two classification cycles if Class 4 is presented on the first cycle. The TPS23754 device presents the same (resistor programmed) class each cycle per the standard.

Table 1. Class Resistor Selection

CLASS POWER AT PD RESISTOR
(Ω)		 NOTES
MINIMUM
(W)		 MAXIMUM
(W)
0 0.44 13 1270 Minimum may be reduced by pulsed loading. Serves as a catch-all default class.
1 0.44 3.84 243
2 3.84 6.49 137
3 6.49 13 90.9
4 13 25.5 63.4 Not allowed before IEEE 802.3at. Use to indicate a Type 2 PD (high power) device per IEEE 802.3at.