Manuali utente per Texas Instruments TPS23751 Evaluation Module TPS23751EVM-104

Sommario

• FEATURES

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• APPLICATIONS

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• DESCRIPTION

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• ABSOLUTE MAXIMUM RATINGS

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• THERMAL INFORMATION

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• RECOMMENDED OPERATING CONDITIONS

  3
• ELECTRICAL CHARACTERISTICS

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• CONTROLLER SECTION

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• SLEEP MODE (TPS23752 ONLY)

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• PoE INTERFACE SECTION

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• DEVICE INFORMATION

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  • DEVICE FUNCTIONAL BLOCK DIAGRAMS

    9
  • PIN DESCRIPTION

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• TYPICAL CHARACTERISTICS

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• DETAILED DESCRIPTION

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  • PoE OVERVIEW

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    • Threshold Voltages

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    • PoE Startup Sequence

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    • Detection

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    • Hardware Classification

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    • Inrush and Startup

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    • Maintain Power Signature

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    • Startup and Converter Operation

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    • PD Hotswap Operation

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  • Sleep Mode Operation (TPS23752 only)

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    • Converter Controller Features

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    • PWM and VFO Operation; CTL, SRT, and SRD Pin Relationships to Output Load Current

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    • Bootstrap Topology

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    • Current Slope Compensation and Current Limit

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    • RT

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    • T2P, Startup and Power Management

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    • Thermal Shutdown

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    • Adapter ORing

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    • Using DEN to Disable PoE

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    • ORing Challenges

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• APPLICATION INFORMATION

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  • • Input Bridges and Schottky Diodes

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    • Protection, D1

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    • Capacitor, C1

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    • Detection Resistor, RDEN

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    • Classification Resistor, RCLS

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    • APD Pin Divider Network, RAPD1, RAPD2

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    • Setting the PWM-VFO Threshold using the SRT pin

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    • Setting Frequency (RT)

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    • Current Slope Compensation

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    • Voltage Feed-Forward Compensation

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    • Estimating Bias Supply Requirements and Cvc

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    • Switching Transformer Considerations and RVC

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    • T2P Pin Interface

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    • Softstart

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    • Special Switching MOSFET Considerations

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    • Thermal Considerations and OTSD

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    • ESD

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    • Layout

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• REVISION HISTORY

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