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Data sheet
TPS23751
- 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.
Technical documentation
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View all 10 | Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | TPS2375x IEEE 802.3at PoE Interface With Flyback DC-DC Controller datasheet (Rev. E) | PDF | HTML | 26 Jan 2018 |
| Application note | PoE Powered Devices Debug Guidelines | PDF | HTML | 19 Jul 2021 | |
| Application note | PoE PD Schematic Review Guidelines | PDF | HTML | 29 Apr 2021 | |
| Selection guide | Power Management Guide 2018 (Rev. R) | 25 Jun 2018 | ||
| Technical article | Maximizing PoE PD efficiency on a budget | PDF | HTML | 10 Nov 2015 | |
| Application note | Lightning Surge Considerations for PoE Powered Devices | 30 Apr 2015 | ||
| User guide | TPS23751EVM-104 EVM: Evaluation Module for TPS23751 (Rev. A) | 02 Nov 2012 | ||
| Application note | High Efficiency Class 4 PoE Powered Device | 23 Mar 2011 | ||
| Application note | Advanced Adapter ORing Solutions using the TPS23753 (Rev. A) | 09 Feb 2009 | ||
| Application note | Designing an EMI Compliant PoE with Isolated Flyback | 20 May 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
Simulation tool
PSPICE-FOR-TI — PSpice® for TI design and simulation tool
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 (...)
Reference designs
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.
Reference designs
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 (...)
Reference designs
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 (...)
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| HTSSOP (PWP) | 16 | Ultra Librarian |
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