ZHCSJO0A April   2019  – November 2020 TPS23758

PRODUCTION DATA  

1. 1 特性
2. 2 应用
3. 3 说明
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: DC-DC Controller Section
   6. 6.6 Electrical Characteristics: PoE and Control
   7. 6.7 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  CLS Classification
      2. 7.3.2  DEN Detection and Enable
      3. 7.3.3  APD Auxiliary Power Detect
      4. 7.3.4  Internal Pass MOSFET
      5. 7.3.5  DC-DC Controller Features
         1. 7.3.5.1 VCC, VB and Advanced PWM Startup
         2. 7.3.5.2 CS, Current Slope Compensation and Blanking
         3. 7.3.5.3 COMP, FB, CP and Opto-less Feedback
         4. 7.3.5.4 FRS Frequency Setting and Synchronization
         5. 7.3.5.5 Frequency Dithering for Spread Spectrum Applications
         6. 7.3.5.6 SST and Soft-Start of the Switcher
      6. 7.3.6  Internal Switching FET - DRAIN, RSNS, SRF and SRR
      7. 7.3.7  VPD Supply Voltage
      8. 7.3.8  VDD Supply Voltage
      9. 7.3.9  GND
      10. 7.3.10 VSS
      11. 7.3.11 Exposed Thermal PAD
   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 Maintain Power Signature (MPS)
      7. 7.4.7 Start-Up and Converter Operation
      8. 7.4.8 PD Self-Protection
      9. 7.4.9 Adapter ORing
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 Procedure
         1. 8.2.2.1  Input Bridges and Schottky Diodes
         2. 8.2.2.2  Softstart Capacitor, Css
         3. 8.2.2.3  Protection, D1
         4. 8.2.2.4  Capacitor, C1
         5. 8.2.2.5  Detection Resistor, RDEN
         6. 8.2.2.6  Classification Resistor
         7. 8.2.2.7  Bulk Capacitance, CBULK
         8. 8.2.2.8  Output Voltage Feedback Divider, RAUX, R1,R2
         9. 8.2.2.9  Setting Frequency, RFRS
         10. 8.2.2.10 Frequency Dithering, RDTR and CDTR
         11. 8.2.2.11 Bias Voltage, CVB and DVB
         12. 8.2.2.12 Transformer design, T1
         13. 8.2.2.13 Current Sense Resistor, RCS
         14. 8.2.2.14 Current Slope Compensation, RS
         15. 8.2.2.15 Bias Supply Requirements, CCC, DCC
         16. 8.2.2.16 Switching Transformer Considerations, RVCC and CCC2
         17. 8.2.2.17 Primary FET Clamping, RCL, CCL, and DCL
         18. 8.2.2.18 Converter Output Capacitance, COUT
         19. 8.2.2.19 Synchronous Rectifier, QR
         20. 8.2.2.20 Synchronous Rectifier Clamp, DZ
         21. 8.2.2.21 Synchronous Rectifier Gate Diode, DG
         22. 8.2.2.22 Sync Rectifier Slew Rate Control, RG
         23. 8.2.2.23 Slew rate control, RSRF and RSRR
         24. 8.2.2.24 Shutdown at Low Temperatures, DVDD and CVDD
      3. 8.2.3 Application Curves
9. 9 Power Supply Recommendations
10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
11. 11Device and Documentation Support
    1. 11.1 Related documentation
    2. 11.2 支持资源
    3. 11.3 Trademarks
    4. 11.4 静电放电警告
    5. 11.5 术语表
12. 12Mechanical, Packaging, and Orderable Information
    1. 12.1 Package Option Addendum
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