SLVS933C July   2009  – April 2016 TPS23753A

PRODUCTION DATA.  

  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Product Information
  6. Pin Configuration and 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: Controller Section Only
    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 Pin Description
        1. 8.3.1.1  APD
        2. 8.3.1.2  BLNK
        3. 8.3.1.3  CLS
        4. 8.3.1.4  CS
        5. 8.3.1.5  CTL
        6. 8.3.1.6  DEN
        7. 8.3.1.7  FRS
        8. 8.3.1.8  GATE
        9. 8.3.1.9  RTN
        10. 8.3.1.10 VB
        11. 8.3.1.11 VC
        12. 8.3.1.12 VDD
        13. 8.3.1.13 VDD1
        14. 8.3.1.14 VSS
    4. 8.4 Device Functional Modes
      1. 8.4.1  Threshold Voltages
      2. 8.4.2  PoE Start-Up Sequence
      3. 8.4.3  Detection
      4. 8.4.4  Hardware Classification
      5. 8.4.5  Maintain Power Signature (MPS)
      6. 8.4.6  TPS23753A Operation
        1. 8.4.6.1 Start-Up and Converter Operation
        2. 8.4.6.2 PD Self-Protection
        3. 8.4.6.3 Converter Controller Features
      7. 8.4.7  Special Switching MOSFET Considerations
      8. 8.4.8  Thermal Considerations
      9. 8.4.9  Blanking - RBLNK
      10. 8.4.10 Current Slope Compensation
      11. 8.4.11 FRS and Synchronization
      12. 8.4.12 Adapter ORing
      13. 8.4.13 Protection
      14. 8.4.14 Frequency Dithering for Conducted Emissions Control
  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
      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

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6 Pin Configuration and Functions

PW Package
14-Pin TSSOP
Top View

Pin Functions

PIN I/O DESCRIPTION
NO. NAME
1 CTL I The control loop input to the PWM (pulse width modulator). Use VB as a pullup for CTL.
2 VB O 5-V bias rail for DC-DC control circuits. Apply a 0.1-μF ceramic capacitor to RTN. VB may be used to bias an external optocoupler for feedback.
3 CS I DC-DC converter switching MOSFET current-sense input. Connect CS to the high side of RCS.
4 VC I/O DC-DC converter bias voltage. The internal start-up current source and converter bias winding output power this pin. Connect a 0.22-μF minimum ceramic capacitor to RTN, and a larger capacitor to facilitate start-up.
5 GATE O Gate drive output for the DC-DC converter switching MOSFET.
6 RTN RTN is the negative rail input to the DC-DC converter and output of the PoE hotswap.
7 VSS Negative power rail derived from the PoE source.
8 VDD1 Source of DC-DC converter start-up current. Connect to VDD for most applications.
9 VDD Positive input power rail for PoE interface circuit. Derived from the PoE source.
10 DEN I/O Connect a 24.9-kΩ resistor from DEN to VDD to provide the PoE detection signature. Pulling this pin to VSS during powered operation causes the internal hotswap MOSFET to turn off.
11 CLS O Connect a resistor from CLS to VSS to program the classification current.
12 APD I Pull APD above 1.5 V to disable the internal PD hotswap switch, forcing power to come from an external adapter. Connect to the adapter through a resistor divider.
13 BLNK I/O Connect to RTN to use the internally set blanking period or connect through a resistor to RTN to program the blanking period.
14 FRS I/O Connect a resistor from FRS to RTN to program the converter switching frequency.