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Product details

Parameters

Vin (Min) (V) 15.7 Vin (Max) (V) 57 PoE current limit (Min) (mA) 850 PoE inrush limit (Typ) (mA) 140 rDS(on) per FET (Typ) (mOhms) 430 PoE standards supported 802.3at Type 1 (802.3af), 802.3at Type 2 PD power level 13W, 25W 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

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

Features

  • Powers up to 30-W (Input) PDs
  • DC-DC Control Optimized for Isolated Converters
  • Supports High-Efficiency Topologies
  • Complete PoE Interface
  • Enhanced Classification per IEEE 802.3at With Status Flag
  • Adapter ORing Support
  • Programmable Frequency With Synchronization
  • Robust 100-V, 0.5-Ω Hotswap MOSFET
  • –40°C to 125°C Junction Temperature Range
  • Industry Standard PowerPAD™ HTSSOP-20

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Description

The TPS23754 and TPS23756 devices have 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.

The TPS23754 and TPS23756 support a number of input voltage ORing options including highest voltage, external adapter preference, and PoE preference. These features allow the designer to determine which power source will carry the load under all conditions.

The PoE interface features the new extended hardware classification necessary for compatibility with high-power midspan power sourcing equipment (PSE) per IEEE 802.3at. 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 the design of active-clamp forward converters or optimized gate drive for highly-efficient flyback topologies. The second gate driver may be disabled if desired for single MOSFET topologies. The controller also features internal soft start, bootstrap start-up 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 TPS23754 device has a 15-V converter start-up while the TPS23756 device has a 9-V converter start-up. The TPS23754-1 replaces the PPD pin with a no-connect for increased pin spacing.

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Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 8
Type Title Date
* Datasheet TPS2375x IEEE 802.3at, High Efficiency, PoE Interface and DC-DC Controller datasheet (Rev. I) Dec. 19, 2017
User guides TPS23754EVM-383 EVM: Evaluation Module for TPS23754. (Rev. C) Nov. 28, 2011
Application notes Implementing a Buck Converter With the TPS23753A Sep. 20, 2010
Application notes Using the TPS23753A with an External Error Amplifier Aug. 06, 2010
User guides TPS23754EVM-420 EVM: Evaluation Module for TPS Apr. 17, 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

TPS23754EVM-383 will allow reference circuitry evaluation of the TPS23754. It contains input and output power connectors and an array of on board test points for circuit evaluation. A synchronous flyback, 5 V, 25 W EVM is also available.

Features
  • Ethernet Alliance certified for receiving Class 4 power
  • Efficient, general market design
  • Self driven, synchronous rectified secondary
  • 25 w output power from power over ethernet (POE), 30W output power from a 48 V adapter
  • Operates from either POE or external adaptors (48 V)
  • 12 V output voltage
EVALUATION BOARDS Download
document-generic User guide
99
Description

TPS23754EVM-420 will allow reference circuitry evaluation of the TPS23754. It contains input and output power connectors and an array of on board test points for circuit evaluation. An active clamp, 12 V, 30 W EVM is also available.

Features
  • Efficient, general market design
  • Self driven, synchronous rectified secondary
  • 25W output power from power over ethernet (PoE), 30W output power from a 48V adapter
  • Operates from either PoE or external adaptors (24 and 48V)
  • 5V output voltage

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)

CAD/CAE symbols

Package Pins Download
HTSSOP (PWP) 20 View options

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