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TPS23751

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IEEE 802.3at PoE interface with flyback DC-DC controller

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Data sheet

TPS23751

ACTIVE
Data sheet Order now

Product details

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 Vin (max) (V) 57 Vin (min) (V) 9.2 PoE current limit (min) (mA) 850 PoE inrush limit (mA) (typ) (A) 0.14 rDS(on) per FET (typ) (mΩ) 450 Features Primary-side adapter priority, Thermal shutdown, VFO Fault response Auto Retry Operating temperature range (°C) -40 to 85 Rating Catalog
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 Vin (max) (V) 57 Vin (min) (V) 9.2 PoE current limit (min) (mA) 850 PoE inrush limit (mA) (typ) (A) 0.14 rDS(on) per FET (typ) (mΩ) 450 Features Primary-side adapter priority, Thermal shutdown, VFO Fault response Auto Retry Operating temperature range (°C) -40 to 85 Rating Catalog
HTSSOP (PWP) 16 32 mm² (5 mm × 6.4 mm)
  • IEEE 802.3at Classification With Status Flag
  • High Efficiency Solutions Over Wide Load Range
  • Powers Up to 25.5 W PDs
  • Robust 100 V, 0.5 Ω Hotswap MOSFET
  • Synchronous Rectifier Disable Signal
  • PowerPAD™ TSSOP Packages
  • Complete PoE Interface Plus DC-DC Controller
  • Adapter ORing Support
  • Programmable Frequency
  • TPS23752 Supports Ultra-Low Power Sleep Modes
  • –40°C to 125°C Junction Temperature Range
  • IEEE 802.3at Classification With Status Flag
  • High Efficiency Solutions Over Wide Load Range
  • Powers Up to 25.5 W PDs
  • Robust 100 V, 0.5 Ω Hotswap MOSFET
  • Synchronous Rectifier Disable Signal
  • PowerPAD™ TSSOP Packages
  • Complete PoE Interface Plus DC-DC Controller
  • Adapter ORing Support
  • Programmable Frequency
  • TPS23752 Supports Ultra-Low Power Sleep Modes
  • –40°C to 125°C Junction Temperature Range

The TPS23751 is a 16-pin integrated circuit that combines a Power-over-Ethernet (PoE) powered device (PD) interface and a current-mode DC-DC controller optimized specifically for applications requiring high efficiency over a wide load range.

The PoE interface implements type-2 hardware classification per IEEE 802.3at. It also includes an auxiliary power detect (APD) input and a disable function (DEN). A 0.5-Ω, 100-V pass MOSFET minimizes heat dissipation and maximizes power utilization.

The DC-DC controller features internal soft-start, a bootstrap startup current source, current-mode control with slope compensation, blanking, and current limiting. Efficiency is enhanced at light loads by disabling synchronous rectification and entering variable frequency operation (VFO).

The TPS23752 is a 20-pin extended version of the TPS23751 with the addition of a Sleep Mode feature. Sleep Mode disables the converter to minimize power consumption while still generating the Maintain Power Signature (MPS) required by IEEE802.3at.

The TPS23751 is a 16-pin integrated circuit that combines a Power-over-Ethernet (PoE) powered device (PD) interface and a current-mode DC-DC controller optimized specifically for applications requiring high efficiency over a wide load range.

The PoE interface implements type-2 hardware classification per IEEE 802.3at. It also includes an auxiliary power detect (APD) input and a disable function (DEN). A 0.5-Ω, 100-V pass MOSFET minimizes heat dissipation and maximizes power utilization.

The DC-DC controller features internal soft-start, a bootstrap startup current source, current-mode control with slope compensation, blanking, and current limiting. Efficiency is enhanced at light loads by disabling synchronous rectification and entering variable frequency operation (VFO).

The TPS23752 is a 20-pin extended version of the TPS23751 with the addition of a Sleep Mode feature. Sleep Mode disables the converter to minimize power consumption while still generating the Maintain Power Signature (MPS) required by IEEE802.3at.

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Technical documentation

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Top documentation Type Title Format options Date
* Data sheet TPS2375x IEEE 802.3at PoE Interface With Flyback DC-DC Controller datasheet (Rev. E) PDF | HTML Jan 26, 2018
Application note PoE Powered Devices Debug Guidelines PDF | HTML Jul 19, 2021
Application note PoE PD Schematic Review Guidelines PDF | HTML Apr 29, 2021
Selection guide Power Management Guide 2018 (Rev. R) Jun 25, 2018
Technical article Maximizing PoE PD efficiency on a budget PDF | HTML Nov 10, 2015
Application note Lightning Surge Considerations for PoE Powered Devices Apr 30, 2015
Application note High Efficiency Class 4 PoE Powered Device Mar 23, 2011
Application note Advanced Adapter ORing Solutions using the TPS23753 (Rev. A) Feb 9, 2009
Application note Designing an EMI Compliant PoE with Isolated Flyback May 20, 2008

Design & development

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

Evaluation board

TPS23751EVM-104 — TPS23751 Evaluation Module

TPS23751EVM-104 contains evaluation and reference circuitry for the TPS23751, which is a Class 4 (25.5W) PoE PD + PWM Controller. The TPS23751 is targeted at flyback only applications and is compliant with the IEEE 802.3at Power over Ethernet (PoE) standard. This EVM contains input & output (...)
User guide: PDF
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Calculation tool

SLUC480 — PoE PD Efficiency Calculator

Supported products & hardware
Reference design

PMP11254 — Class 4 PoE Flyback Converter (12V@2.125A) Reference Design

The flyback topology with diode rectification provides a low-cost solution for Class 4 PoE applications. The TPS23751 is a combination Power over Ethernet (PoE) powered device (PD) controller and PWM controller which saves cost and board space. This converter is well suited for PoE applications (...)
Supported products & hardware
Reference design

PMP20220 — Class 4 high efficiency PoE flyback-synchronous converter (5V/3A) reference design

This reference design utilizes the TPS23751 combination PoE PD controller and PWM controller, saving cost and size.  The synchronous flyback converter provides high efficiency for PoE applications such as wireless access points and IP phones.  The PoE PD can also supply up to 10W of (...)
Supported products & hardware
Reference design

TIDA-00617 — Class 4 High-Efficiency Driven Flyback Converter (5V/5A) for PoE PD Applications Reference Design

The TIDA-00617 reference design uses the TPS23751 PoE PD controller in a high effciency (driven) synch flyback converter capable of 5V at 5A.

Supported products & hardware
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HTSSOP (PWP) 16 Ultra Librarian
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