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Product details

Parameters

Vin (Min) (V) 9.3 Vin (Max) (V) 57 PoE current limit (Min) (mA) 400 PoE inrush limit (Typ) (mA) 140 rDS(on) per FET (Typ) (mOhms) 430 PoE standards supported 802.3at Type 1 (802.3af) PD power level 13W DC/DC control PD and DC/DC Fault response Auto Retry Features Primary Side Adapter Priority, Second Gate Drive, Thermal Shutdown Switching frequency Programmable, Synchronizable open-in-new Find other Powered devices

Package | Pins | Size

TSSOP (PW) 20 42 mm² 6.5 x 6.4 open-in-new Find other Powered devices

Features

  • 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
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Description

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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TPS23755 ACTIVE IEEE 802.3at PoE PD with no-opto flyback DC-DC controller This product utilizes a primary side regulated diode rectified flyback topology and integrates the switching FET.

Technical documentation

= Top documentation for this product selected by TI
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Type Title Date
* Datasheet High Efficiency PoE Interface and DC/DC Controller datasheet (Rev. D) Nov. 20, 2013
Selection guides Power Management Guide 2018 (Rev. R) Jun. 25, 2018
Application notes Lightning Surge Considerations for PoE Powered Devices Apr. 30, 2015
Application notes Implementing a Buck Converter With the TPS23753A Sep. 20, 2010
User guides TPS23757EVM: Evaluation Module for TPS23757 (Rev. B) Aug. 30, 2010
Application notes Using the TPS23753A with an External Error Amplifier Aug. 06, 2010
Application notes Advanced Adapter ORing Solutions using the TPS23753 (Rev. A) Feb. 09, 2009
Application notes PoE Powered Device for 24 VAC Building Power Applications Sep. 10, 2008
Application notes Designing an EMI Compliant PoE with Isolated Flyback May 20, 2008
Application notes Practical Guidelines EMI Compliant PoE Mar. 27, 2008

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

EVALUATION BOARDS Download
document-generic User guide
49
Description

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 (...)

Features
  • Efficient, general market design
  • Self-driven, synchronous rectified secondary
  • 11-W output power from power-over-ethernet (POE) or from a 48-V adapter
  • Operates from either POE or external adapters (24 V, 48 V)
  • 5-V output voltage
  • NOTE: Only the 5-V version is orderable. The 5-V version can be converted to (...)

Design tools & simulation

SIMULATION TOOLS Download
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Features
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)
CALCULATION TOOLS Download
SLUC480.ZIP (452 KB)

Reference designs

REFERENCE DESIGNS Download
Design files

CAD/CAE symbols

Package Pins Download
TSSOP (PW) 20 View options

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