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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
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Type Title Date
* Datasheet TPS2375x IEEE 802.3at, High Efficiency, PoE Interface and DC-DC Controller datasheet (Rev. I) Dec. 19, 2017
Application note Alleviating Short Circuit Thermal Concerns for PoE Powered Devices Jun. 05, 2020
Selection guide Power Management Guide 2018 (Rev. R) Jun. 25, 2018
Technical articles Flyback converters: two outputs are better than one Nov. 24, 2016
Technical articles Maximizing PoE PD efficiency on a budget Nov. 10, 2015
Application note Lightning Surge Considerations for PoE Powered Devices Apr. 30, 2015
Application note Efficiency-Optimized, Synchronous Flyback, High-Power PoE Controller/Converter Jan. 17, 2012
User guide TPS23754EVM-383 EVM: Evaluation Module for TPS23754. (Rev. C) Nov. 28, 2011
Application note High Efficiency Class 4 PoE Powered Device Mar. 23, 2011
Application note Implementing a Buck Converter With the TPS23753A Sep. 20, 2010
Application note Using the TPS23753A with an External Error Amplifier Aug. 06, 2010
User guide TPS23754EVM-420 EVM: Evaluation Module for TPS Apr. 17, 2009
Application note Advanced Adapter ORing Solutions using the TPS23753 (Rev. A) Feb. 09, 2009
Application note PoE Powered Device for 24 VAC Building Power Applications Sep. 10, 2008
Application note Designing an EMI Compliant PoE with Isolated Flyback May 20, 2008
Application note 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 BOARD Download
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 BOARD Download
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 TOOL 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 TOOL Download
SLUC480.ZIP (452 KB)

Reference designs

REFERENCE DESIGNS Download
Class 4 PoE PD (24-V/0.9-A) power supply reference design
PMP22301 — This reference design utilizes a flyback converter to implement a Class 4 Power over Ethernet (PoE) poweredDevice dPD) with a 24-V/0.9-A output. The TPS23754
is a combination PD/PWM controller in one package, saving cost and space. This reference design is suited for many PoE applications such as (...)
document-generic Schematic
REFERENCE DESIGNS Download
Class 4, Cost-optimized, Flyback Converter Reference Design for PoE Applications
PMP6812 This reference evaluation module, featuring the TPS23754 PoE interface and DC-to-DC controller is used for class 4 PoE applications.

The flyback topology with diode rectification results in a low-cost converter for PoE applications such as a security camera. With the appropriate BOM changes, PMP6812 (...)

document-generic Schematic
REFERENCE DESIGNS Download
Class 4 PoE High Efficiency Active Clamp Forward Converter (3.3V) Reference Design
PMP10288 The PMP10288 reference design is a Power Over Ethernet (POE) active clamp forward converter. It features the TPS23754, which is a combination of a POE Powered Device (PD) controller and PWM controller. CSD17501Q5A FETs are used for high efficiency synchronous rectification. The input accepts (...)
document-generic Schematic
REFERENCE DESIGNS Download
Class 4 12V/2.5A Active Clamp Forward Converter for PoE PD Application Reference Design
PMP9563 This reference design is a Power Over Ethernet (POE) active clamp forward converter. It features the TPS23754, which is a combination of a POE Powered Device (PD) controller and PWM controller. CSD19534Q5A FETs are used for high efficiency synchronous rectification. The input accepts standard Type 2 (...)
document-generic Schematic
REFERENCE DESIGNS Download
Class 4- 3.3V/7.6A Active Clamp Forward Converter Reference Design for PoE Applications
PMP7452 This converter reference design is used for Class 4 PoE applications where high efficiency is required. The active clamp forward converter with synchronous rectifiers provides excellent efficiency and small size for PoE applications such as a wireless access point. The TPS23754 contains both the PoE (...)
document-generic Schematic
REFERENCE DESIGNS Download
Class 4, Efficiency-Optimized, Flyback Converter Reference Design for PoE Applications
PMP6672 This reference evaluation module, featuring the TPS23754 PoE interface and DC-to-DC controller, is used for Class 4 PoE applications where high efficiency is required. Output power is 5V at 5A from either an adapter input(21.6-57VDC) or power over ethernet. in general, the efficiency gain is on the (...)
document-generic Schematic
Design files
REFERENCE DESIGNS Download
Class 4 PoE - 33Vdc-57Vdc Input, 3.3V/7.6A Active Clamp Forward
PMP4908 — The PMP4908 reference design uses the TPS23754 PoE controller to control an active clamp forward converter that delivers up to 25W at 3.3V. The CSD16406 synchronous rectifiers allow this design to achieve efficiencies over 93%.
REFERENCE DESIGNS Download
5V, 4.8A High Efficiency Active Clamp Forward Converter for PoE Applications
PMP5818 — This converter is used for Class 4 PoE applications where high efficiency is required. The active clamp forward converter with synchronous rectifiers provides excellent efficiency and small size for PoE applications such as a wireless access point. The TPS23754 contains both the PoE Powered Device (...)
REFERENCE DESIGNS Download
Class 4- 33Vdc-57Vdc Input, 12V/2.1A Active Clamp Forward
PMP4909 — The PMP4909 reference design uses the TPS23754 PoE controller to control an active clamp forward converter that delivers up to 25W at 12V. This design uses synchronous rectifiers to achieve efficiencies over 92%.
REFERENCE DESIGNS Download
Parallel Flyback Converters (12V@4A) for PoE Powered Device (PD) Reference Design
PMP5236 PMP5236 uses parallel converters for Class 4 or high power PoE applications. The flyback converter with diode rectifier offers low cost solution while still achieving good efficiency. This reference design is well suited for PoE applications where power redundancy (12V@2A) or output power sharing (...)

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HTSSOP (PWP) 20 View options

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