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Circuitos integrados de alimentación a través de Ethernet (PoE)
Dispositivos alimentados

TPS23757

ACTIVO

PD de PoE de clase 3 con controlador CC-CC de retorno/avance y compatibilidad con adaptador de 12 V-

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TPS23757

ACTIVO
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Detalles del producto

PoE standards supported 802.3at Type 1 (802.3af) PD power level 13W DC/DC control PD and DC/DC Vin (max) (V) 57 Vin (min) (V) 9.3 PoE current limit (min) (mA) 400 PoE inrush limit (mA) (typ) (A) 0.14 rDS(on) per FET (typ) (mΩ) 430 Features Primary-side adapter priority, Second Gate Drive, Thermal shutdown Fault response Auto Retry Operating temperature range (°C) -40 to 125 Rating Catalog
PoE standards supported 802.3at Type 1 (802.3af) PD power level 13W DC/DC control PD and DC/DC Vin (max) (V) 57 Vin (min) (V) 9.3 PoE current limit (min) (mA) 400 PoE inrush limit (mA) (typ) (A) 0.14 rDS(on) per FET (typ) (mΩ) 430 Features Primary-side adapter priority, Second Gate Drive, Thermal shutdown Fault response Auto Retry Operating temperature range (°C) -40 to 125 Rating Catalog
TSSOP (PW) 20 41.6 mm² (6.5 mm × 6.4 mm)
  • Powers up to 13 W (Input) PDs
  • Legacy and IEEE 802.3at Type 1 PDs
  • Optimized for Isolated DC/DC Converters
  • Supports High-Efficiency Topologies
  • Complete PoE Interface
  • Adapter ORing Support
  • Programmable Frequency with Synch.
  • Robust 100 V, 0.5 Ω Hotswap MOSFET
  • Pin Compatible with TPS23754/6
  • –40°C to 125°C Junction Temperature Range
  • Industry Standard TSSOP-20
  • Powers up to 13 W (Input) PDs
  • Legacy and IEEE 802.3at Type 1 PDs
  • Optimized for Isolated DC/DC Converters
  • Supports High-Efficiency Topologies
  • Complete PoE Interface
  • Adapter ORing Support
  • Programmable Frequency with Synch.
  • Robust 100 V, 0.5 Ω Hotswap MOSFET
  • Pin Compatible with TPS23754/6
  • –40°C to 125°C Junction Temperature Range
  • Industry Standard TSSOP-20

The TPS23757 is a combined Power over Ethernet (PoE) powered device (PD) interface and current-mode dc/dc controller optimized specifically for isolated converters. The PoE interface supports the IEEE 802.3at standard for a type 1 PD, which is equivalent to the 13W standard of IEEE 802.3-2008.

The TPS23757 supports a number of input voltage ORing options including highest voltage, external adapter preference, and PoE preference.

The TPS23757 has an output flag indicating if an external wall adapter is active when used in conjunction with ORing controls. The detection signature pin can also be used to force power from the PoE source off. Classification can be programmed to any of the defined types with a single resistor.

The dc/dc controller features two complementary gate drivers with programmable dead time. This simplifies design of highly-efficient flyback topologies or active-clamp forward or flyback converters. The second gate driver may be disabled if desired for single MOSFET topologies. The controller also features internal softstart, bootstrap startup source, current-mode compensation, and a 78% maximum duty cycle. A programmable and synchronizable oscillator allows design optimization for efficiency and eases use of the controller to upgrade existing power supply designs. Accurate programmable blanking, with a default period, simplifies the usual current- sense filter design trade-offs.

The TPS23757 has a 9 V converter startup, permitting operation with 12 V wall adapters.

The TPS23757 is a combined Power over Ethernet (PoE) powered device (PD) interface and current-mode dc/dc controller optimized specifically for isolated converters. The PoE interface supports the IEEE 802.3at standard for a type 1 PD, which is equivalent to the 13W standard of IEEE 802.3-2008.

The TPS23757 supports a number of input voltage ORing options including highest voltage, external adapter preference, and PoE preference.

The TPS23757 has an output flag indicating if an external wall adapter is active when used in conjunction with ORing controls. The detection signature pin can also be used to force power from the PoE source off. Classification can be programmed to any of the defined types with a single resistor.

The dc/dc controller features two complementary gate drivers with programmable dead time. This simplifies design of highly-efficient flyback topologies or active-clamp forward or flyback converters. The second gate driver may be disabled if desired for single MOSFET topologies. The controller also features internal softstart, bootstrap startup source, current-mode compensation, and a 78% maximum duty cycle. A programmable and synchronizable oscillator allows design optimization for efficiency and eases use of the controller to upgrade existing power supply designs. Accurate programmable blanking, with a default period, simplifies the usual current- sense filter design trade-offs.

The TPS23757 has a 9 V converter startup, permitting operation with 12 V wall adapters.
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Documentación técnica

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Documentación principal Tipo Título Opciones de formato Descargar la versión más reciente en inglés Fecha
* Hoja de datos High Efficiency PoE Interface and DC/DC Controller datasheet (Rev. D) 20/11/2013
Nota sobre la aplicación PoE Powered Devices Debug Guidelines PDF | HTML 19/07/2021
Nota sobre la aplicación PoE PD Schematic Review Guidelines PDF | HTML 29/04/2021
Guía de selección Power Management Guide 2018 (Rev. R) 25/06/2018
Nota sobre la aplicación Lightning Surge Considerations for PoE Powered Devices 30/04/2015
Nota sobre la aplicación Implementing a Buck Converter With the TPS23753A 20/09/2010
Nota sobre la aplicación Using the TPS23753A with an External Error Amplifier 6/08/2010
Nota sobre la aplicación Advanced Adapter ORing Solutions using the TPS23753 (Rev. A) 9/02/2009
Nota sobre la aplicación PoE Powered Device for 24 VAC Building Power Applications 10/09/2008
Nota sobre la aplicación Designing an EMI Compliant PoE with Isolated Flyback 20/05/2008
Nota sobre la aplicación Practical Guidelines EMI Compliant PoE 27/03/2008

Diseño y desarrollo

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Placa de evaluación

TPS23757EVM — Interfaz de PoE con entrada de 22-57 V y salida de 5 V, de alta eficiencia y módulo de evaluación de

The TPS23757EVM contains evaluation and reference circuitry for the TPS23757. The TPS23757 contains a powered device (PD) and a power supply controller supporting many high-efficiency topologies. The TPS23757EVM supports the IEEE 802.3at (draft) standard for a type 1 PD (equivalent to the 13W (...)

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Herramienta de cálculo

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