ZHCSJE2B December   2018  – November 2020 TPS23755

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  Internal Pass MOSFET
      4. 7.3.4  DC-DC Controller Features
         1. 7.3.4.1 VCC, VB and Advanced PWM Startup
         2. 7.3.4.2 CS, Current Slope Compensation and Blanking
         3. 7.3.4.3 COMP, FB, CP and Opto-less Feedback
         4. 7.3.4.4 FRS Frequency Setting and Synchronization
         5. 7.3.4.5 Frequency Dithering for Spread Spectrum Applications
         6. 7.3.4.6 SST and Soft-Start of the Switcher
         7. 7.3.4.7 AUX_V, AUX_D and Secondary Adapter Or'ing
      5. 7.3.5  Internal Switching FET - DRAIN, RSNS, SRF and SRR
      6. 7.3.6  VPD Supply Voltage
      7. 7.3.7  VDD Supply Voltage
      8. 7.3.8  GND
      9. 7.3.9  VSS
      10. 7.3.10 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  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  Bulk Capacitance, CBULK
         7. 8.2.2.7  Output Voltage Feedback Divider, RAUX, R1,R2
         8. 8.2.2.8  Setting Frequency, RFRS
         9. 8.2.2.9  Frequency Dithering, RDTR and CDTR
         10. 8.2.2.10 Bias Voltage, CVB and DVB
         11. 8.2.2.11 Transformer design, T1
         12. 8.2.2.12 Current Sense Resistor, RCS
         13. 8.2.2.13 Current Slope Compensation, RS
         14. 8.2.2.14 Bias Supply Requirements, CCC, DCC
         15. 8.2.2.15 Switching Transformer Considerations, RVCC and CCC2
         16. 8.2.2.16 Primary FET Clamping, RCL, CCL, and DCL
         17. 8.2.2.17 Converter Output Capacitance, COUT
         18. 8.2.2.18 Secondary Output Diode Rectifier, DOUT
         19. 8.2.2.19 Slew rate control, RSRF and RSRR
         20. 8.2.2.20 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