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TPS2378

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IEEE 802.3at PoE High-Power PD interface with AUX Control

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IEEE 802.3at PoE High-Power PD interface with AUX Control

TPS2378

ACTIVE
Data sheet Order now

Product details

Parameters

Vin (Min) (V) 0 Vin (Max) (V) 57 PoE current limit (Min) (mA) 850 PoE inrush limit (Typ) (mA) 140 rDS(on) per FET (Typ) (mOhms) 420 PoE standards supported 802.3at Type 1 (802.3af), 802.3at Type 2 PD power level 13W, 25W DC/DC control PD Only Fault response Auto Retry Features PG, Primary Side Adapter Priority, Thermal Shutdown open-in-new Find other Powered devices

Package | Pins | Size

HSOIC (DDA) 8 19 mm² 4.9 x 3.9 open-in-new Find other Powered devices

Features

  • IEEE 802.3at Type-2 Hardware Classification with Status Flag
  • Adapter Priority Input
  • DC/DC Converter Enable
  • Robust 100 V, 0.5-Ω Hotswap MOSFET
  • Operating Current up to 850 mA
  • 1-A (Typical) Operating Current Limit
  • 15 kV and 8 kV System-level ESD Capability
  • PowerPAD HSOP Package

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Description

This 8-pin integrated circuit contains all of the features needed to implement an IEEE802.3at type-2 powered device (PD). The low 0.5-Ω internal switch resistance, combined with the enhanced thermal dissipation of the PowerPAD™ package, enables this controller to continuously handle up to 0.85 A. The TPS2378 features an auxiliary power detect (APD) input, providing priority for an external power adapter. It also features a 100-V pass transistor, 140-mA inrush current limiting, type-2 indication, auto-retry fault protection, and an open-drain power-good output.

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Technical documentation

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Type Title Date
* Datasheet TPS2378 IEEE 802.3at PoE High-Power PD Interface datasheet (Rev. C) Jul. 23, 2015
Selection guide Power Management Guide 2018 (Rev. R) Jun. 25, 2018
User guide TPS2378EVM-602 Evaluation Module User's Guide (Rev. A) Jul. 31, 2017
Application note Dual TPS2378 PD for 51-W High-Power Four-Pair PoE (Rev. A) Jun. 01, 2016
Technical article May the forced UPOE be with you Jun. 15, 2015
Application note Lightning Surge Considerations for PoE Powered Devices Apr. 30, 2015
Technical article Simplifying higher current split-rail designs with Fly-Buck converters Mar. 05, 2015
Technical article Watch your Power over Ethernet OPEX or risk obsolescence! Oct. 09, 2012
User guide TPS2378EVM-105 User's Guide Mar. 20, 2012
Application note Advanced Adapter ORing Solutions using the TPS23753 (Rev. A) Feb. 09, 2009

Design & development

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

Hardware development

EVALUATION BOARD Download
TPS2378 Evaluation Module
TPS2378EVM-105
document-generic User guide
49
Description
The Texas Instruments TPS2378EVM-105 evaluation module (EVM) helps designers evaluate the performance of the TPS2378 IEEE 802.3at PoE High-Power PD Interface with AUX Control. The EVM is designed to look like the front end of any Power Over Ethernet (PoE) PD module. An RJ-45 connector is provided to (...)
Features
  • 100 V, 0.5 Ω Hotswap MOSFET
  • 15 kV/8 kV System-Level ESD Capability
  • DC/DC Converter Enable
  • PowerPad™ SO-8 Package
  • Adapter Priority Input
  • IEEE 802.3at type-2 hardware classification with status flag
View details
EVALUATION BOARD Download
document-generic User guide
99
Description

The TPS2378EVM-602 evaluation module (EVM) is a fully assembled and tested circuit for evaluating the dual TPS2378 four-pair, high power 51W applications. The TPS2378EVM-602 is a Forced UPOE compliant solution that requires no software. The EVM contains header connectors for easy connection to (...)

Features
  • 51W High Power 4-Pair PoE (Forced UPOE)
  • Logic circuitry keeps converter off until both TPS2378 PDs are powered
  • MPS circuit keep PSE ports connected until converter startup
  • Load inhibitor circuit (optional) for high power resistive loads
View details

Design tools & simulation

SIMULATION MODEL Download
SLVM991A.ZIP (114 KB) - PSpice Model
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
  • (...)
View details
CALCULATION TOOL Download
SLUC480.ZIP (452 KB)

Reference designs

REFERENCE DESIGNS Download
Class 2 Non-isolated PoE Buck Converter (5V/1A) Reference Design
PMP10812 — The PMP10812 reference design is ideal for Class 2 PoE PD applications that do not require isolation.  The TPS2378 PD controller provides the interface to the PSE.  The LM5010 buck converter has an integrated high side FET and external low side diode rectifier for low cost.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Class 4 PoE Synchronous Buck Converter (12V/2A) Reference Design
PMP11257 — The LM5116 synchronous buck controller provides a high efficiency solution for non-isolated PoE PD applications.  The TPS2378 PoE PD controller performs all necessary functions for an IEEE802.3at compliant Class 4 PoE PD.  This converter is ideal for any PoE application that demands best (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Non-Standard PoE, UPOE High-Efficiency Flyback Converter Reference Design for PoE PD Applications
TIDA-00741 — TIDA-00741 uses two TPS2378 PD controllers for a forced 4-pair UPOE solution to 51W non-standard PoE PD applications. It incorportates the UCC2897A controller in a high-efficiency, great transient response (driven) synch flyback converter capble of 12V at 3.8A.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Class 1 Non-isolated Buck Converter (5V/560mA) for PoE PD Applications Reference Design
PMP9676 — This converter is used for Class 1 PoE PD applications where isolation is not required.  The TPS2378 PD controller plus LM5006 buck converter provide 5V/560mA with good efficieny in a small size.  The LM5006 can be configured with a diode rectifier for lowest cost or a synchronous FET (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
UPOE High-Efficiency Flyback Converter (19V/2.3A) for Forced 4-Pair PoE PD Apps Reference Design
TIDA-00539 — TIDA-00539 uses two TPS2378 PD controllers for a forced 4-pair UPOE solution to 51W non-standard PoE PD applications. It incorportates the UCC2897A controller in a high-efficiency, great transient response (driven) synch flyback converter capble of 19V at 2.3A.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Class 3 Isolated Fly-Buck Power Module for PoE Application Reference Design
PMP10572 — The PMP10572 reference design is an single output isolated Fly-Buck power supply for PoE application. It takes 48V nominal input and provides 12V 1A output. The board is designed with TPS2378(PD controller) to provide 40V-57V input votlage and 12V 1SA output power. The design features the LM5160A (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
SO PowerPAD (DDA) 8 View options

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