ZHCSMU0D July   2009  – December 2020 TPS23753A

PRODUCTION DATA  

  1. 特性
  2. 应用
  3. 说明
  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  FRS and Synchronization
      10. 8.4.10 Blanking – RBLNK
      11. 8.4.11 Current Slope Compensation
      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 Support Resources
    3. 12.3 Electrostatic Discharge Caution
    4. 12.4 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Electrical Characteristics: Controller Section Only

Unless otherwise noted: CS = APD = CTL = RTN, GATE open, RFRS = 60.4 kΩ, RBLNK = 249 kΩ, CVB = CVC = 0.1 μF, RDEN = 24.9 kΩ, RCLS open, VVDD-VSS = 48 V, VVDD1-RTN = 48 V, 8.5 V ≤ VVC-RTN ≤ 18 V, –40°C ≤ TJ ≤ 125°C [VSS = RTN and VDD = VDD1] or [VSS = RTN = VDD], all voltages referred to RTN. Typical specifications are at 25°C.
PARAMETERTEST CONDITIONSMINTYPMAXUNIT
VC
UVLO_1Undervoltage lockoutVC rising8.6599.3V
UVLO_HHysteresis(1)3.33.53.7
Operating currentVC = 12 V, CTL = VB0.40.580.85mA
tSTStart-up time, CVC = 22 μFVDD1 = 10.2 V, VVC(0) = 0 V5085175

ms

VDD1 = 35 V, VVC(0) = 0 V304885
Start-up current source - IVCVDD1 = 10.2 V, VVC = 8.6 V0.441.061.8mA
VDD1 = 48 V, VVC = 0 V2.54.36
VB
Voltage6.5 V ≤ VC ≤ 18 V, 0 ≤ IVB ≤ 5 mA4.755.15.25V
FRS
Switching frequencyCTL= VB, Measure GATE223248273kHz
RFRS = 60.4 kΩ
DMAXDuty cycleCTL= VB, Measure GATE76%78.5%81%
VSYNCSynchronizationInput threshold22.22.4V
CTL
VZDC0% duty cycle thresholdVCTL ↓ until GATE stops1.31.51.7V
Soft-start periodInterval from switching start to VCSMAX400800μs
Input resistance70100145kΩ
BLNK
Blanking delayIn addition to t1355275ns
BLNK = RTN
RBLNK = 49.9 kΩ415263
CS
VCSMAXMaximum threshold voltageVCTL = VB, VCS ↑ until GATE duty cycle drops0.50.550.6V
t1Turnoff delayVCS = 0.65 V254160ns
VSLOPEInternal slope compensation voltagePeak voltage at maximum duty cycle, referred to CS90118142mV
ISL_EXPeak slope compensation currentVCTL = VB, ICS at maximum duty cycle (ac component)304254μA
Bias current (sourcing)Gate high, DC component of CS current234.2μA
GATE
Source currentVCTL = VB, VC = 12 V, GATE high, Pulsed measurement0.30.460.6A
Sink currentVCTL = VB, VC = 12 V, GATE low, Pulsed measurement0.50.791.1A
APD
VAPDENThreshold voltageVAPD1.421.51.58V
VAPDHHysteresis(1)0.280.30.32
THERMAL SHUTDOWN
Turnoff temperature135145155°C
Hysteresis(2)20°C
The hysteresis tolerance tracks the rising threshold for a given device.
These parameters are provided for reference only, and do not constitute part of TI's published device specifications for purposes of TI's product warranty.