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TPS23756

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Class 4 PoE PD with flyback/forward DC-DC controller & 12V-57V adapter support

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Class 4 PoE PD with flyback/forward DC-DC controller & 12V-57V adapter support

TPS23756

ACTIVE
Data sheet Order now

Product details

Parameters

Vin (Min) (V) 9.3 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

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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
Selection guide Power Management Guide 2018 (Rev. R) Jun. 25, 2018
Application note Lightning Surge Considerations for PoE Powered Devices Apr. 30, 2015
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 TPS23756EVM User's Guide (Rev. A) Apr. 01, 2010
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
document-generic User guide
49
Description

The TPS23756EVM contains evaluation and reference circuitry for the TPS23756, which is a Class 4 (25.5 W) PoE PD + PWM Controller. The TPS23756 is targeted at wide Vin aplications (12 V - 60 V) in isolated converter topologies and is compliant with the IEEE 802.3 at Power over Ethernet (PoE (...)

Features
  • High-power PD and DC-DC converter controllers
  • Wide-input voltage range DC-DC converter
  • Operates from PoE or external adapters
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Design tools & simulation

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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
  • (...)
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CALCULATION TOOL Download
SLUC480.ZIP (452 KB)

Reference designs

REFERENCE DESIGNS Download
Class 3 isolated high-efficiency active clamp flyback converter for PoE power reference design
PMP40514 — This reference design is developed for evaluating 13-W isolated active clamp flyback PD converter system using the IEEE 802.3at PoE interface and DC/DC controller TPS23756. The converter is capable of supporting the 13-W maximum IEEE 802.3at power requirements. It presents good efficiency, load (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Class 4- Wide Input Range 15W PoE Converter
PMP6659 — PMP6659 is a flyback converter with synchronous rectification. It accepts input voltages of 10.8-57VDC/18-32VAC/PoE and has a 12V/1.25A output. This input and output combination is typically required for PoE security cameras. The synchronous rectifier provides excellent efficiency with the wide (...)
REFERENCE DESIGNS Download
Class 4 - Wide Input Range 15W Power over Ethernet (PoE) Converter
TIDA-00091 — Note: TIDA-00091 was implemented using hardware from PMP6659.

The Class 4 – Wide Input Range, 15W Power over Ethernet (PoE) Converter reference design is intended as an evaluation module for users to develop end-products for IP security camera applications.  This reference design has been (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Class 4- High power PoE, active clamp forward converter 8V@3A
PMP6584 — PMP6584 is a high power (non-standard) Power Over Ethernet (POE) active clamp forward converter. It features the TPS23756, which is a combination of a POE Powered Device (PD) controller and PWM controller. It also utilizes an ISO721 digital isolator and TPS28225 synchronous MOSFET driver. The input (...)
Design files
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CAD/CAE symbols

Package Pins Download
HTSSOP (PWP) 20 View options

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