Calculation tool
TPS23752
IEEE 802.3at PoE interface with flyback DC-DC controller and Sleep Mode Feature
Data sheet
TPS23752
- 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 11 | 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 | ||
| Application note | TPS23752 Maintain Power Signature Operation in Sleep Mode | 12 Apr 2013 | ||
| User guide | TPS23752EVM-145 EVM: Evaluation Module for TPS23752 | 28 Jul 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
TPS23752EVM-145 — TPS23752 Evaluation Module
The Texas Instruments TPS23752EVM-145 evaluation module (EVM) helps designers evaluate the performance of the TPS23752 IEEE 802.3at PoE Interface and Green-mode DC/DC Controller. The EVM contains input and output connectors as well as control jumpers to ease evaluation of device features.
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
PMP30290 — 18.5V to 57V Aux-Input to 5.3V, 10W PoE Isolated Sync-Flyback Reference Design
This compact reference design is a typical PoE application, supplying 10W at 5.3V from Ethernet power. Data filter, external auxiliary input and EMI filter are all on board. The synchronous rectification improves the efficiency, important at only 5.3V output voltage.
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| HTSSOP (PWP) | 20 | Ultra Librarian |
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