Support & Reference Product Order Tools & Technical Community Design Folder Now Documents Software TPS23754,TPS23754-1,TPS23756 SLVS885IOCTOBER 2008REVISED DECEMBER 2017 TPS2375x IEEE 802.3at, High Efficiency, PoE Interface and DC-DC Controller 1 1 Features The PoE interface features the new extended Powers up to 30-W (Input) PDs hardware classification necessary for compatibility DC-DC Control Optimized for Isolated Converters with high-power midspan power sourcing equipment Supports High-Efficiency Topologies (PSE) per IEEE 802.3at. The detection signature pin Complete PoE Interface can also be used to force power from the PoE source off. Classification can be programmed to any of the Enhanced Classification per IEEE 802.3at With defined types with a single resistor. Status Flag The DC-DC controller features two complementary Adapter ORing Support gate drivers with programmable dead time. This Programmable Frequency With Synchronization simplifies the design of active-clamp forward Robust 100-V, 0.5- Hotswap MOSFET converters or optimized gate drive for highly-efficient 40C to 125C Junction Temperature Range flyback topologies. The second gate driver may be disabled if desired for single MOSFET topologies. Industry Standard PowerPAD HTSSOP-20 The controller also features internal soft start, bootstrap start-up source, current-mode 2 Applications compensation, and a 78% maximum duty cycle. A IEEE 802.3at Compliant Devices programmable and synchronizable oscillator allows design optimization for efficiency and eases use of Video and VoIP Telephones the controller to upgrade existing power supply RFID Readers designs. Accurate programmable blanking, with a Multiband Access Points default period, simplifies the usual current-sense filter design trade-offs. Security Cameras The TPS23754 device has a 15-V converter start-up 3 Description while the TPS23756 device has a 9-V converter start- The TPS23754 and TPS23756 devices have a up. The TPS23754-1 replaces the PPD pin with a no- combined power-over-ethernet (PoE), powered- connect for increased pin spacing. device (PD) interface, and current-mode DC-DC (1) controller optimized specifically for isolated Device Information converters. The PoE interface supports the IEEE PART NUMBER PACKAGE BODY SIZE (NOM) 802.3at standard. TPS23754 The TPS23754 and TPS23756 support a number of TPS23754-1 HTSSOP (20) 6.50 mm 4.40 mm input voltage ORing options including highest voltage, TPS23756 external adapter preference, and PoE preference. (1) For all available packages, see the orderable addendum at These features allow the designer to determine which the end of the data sheet. power source will carry the load under all conditions. High-Efficiency Converter Using TPS23754 C IO T1 V C OUT IN L OUT M4 R T2P T2P-OUT DEN D R VC1 T2P V CLS C C V OUT L T2P-OUT M3 N/C OR PPD VC D VC2 PAD Type 2 PSE M1 Indicator V V B C SS C V APD GATE B R M2 OB CTL C CS CTL D FRS A R C CTL IZ GAT2 C CL R APD1 D CL TLV431 R Optional DT Interface 1 An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA. From Ethernet From Ethernet Pairs 3,4 Pairs 1,2 Adapter C 1 R APD2 D 1 R R CLS DEN R FRS COM ARTN V DD1 RTN V DD DT BLNK R BLNK C VB C VC R CS R R FBL FBUTPS23754,TPS23754-1,TPS23756 SLVS885IOCTOBER 2008REVISED DECEMBER 2017 www.ti.com Table of Contents 7.3 Feature Description................................................. 13 1 Features.................................................................. 1 7.4 Device Functional Modes........................................ 17 2 Applications........................................................... 1 8 Application and Implementation........................ 27 3 Description............................................................. 1 8.1 Application Information............................................ 27 4 Revision History..................................................... 2 8.2 Typical Application ................................................. 27 5 Pin Configuration and Functions......................... 3 9 Power Supply Recommendations...................... 37 6 Specifications......................................................... 4 10 Layout................................................................... 37 6.1 Absolute Maximum Ratings...................................... 4 10.1 Layout Guidelines................................................. 37 6.2 ESD Ratings.............................................................. 4 10.2 Layout Example.................................................... 37 6.3 Recommended Operating Conditions....................... 5 10.3 ESD....................................................................... 37 6.4 Thermal Information.................................................. 5 11 Device and Documentation Support................. 38 6.5 Electrical Characteristics........................................... 6 11.1 Documentation Support........................................ 38 6.6 Electrical Characteristics: PoE and Control.............. 7 11.2 Community Resources.......................................... 38 6.7 Switching Characteristics.......................................... 9 11.3 Trademarks........................................................... 38 6.8 Typical Characteristics............................................ 10 11.4 Electrostatic Discharge Caution............................ 38 7 Detailed Description............................................ 13 11.5 Glossary................................................................ 38 7.1 Overview................................................................. 13 12 Mechanical, Packaging, and Orderable 7.2 Functional Block Diagram....................................... 13 Information........................................................... 38 4 Revision History NOTE: Page numbers for previous revisions may differ from page numbers in the current version. Changes from Revision H (September 2015) to Revision I Page Changed title to TPS2375x IEEE 802.3at, High Efficiency, PoE Interface and DC-DC Controller........................................ 1 Changes from Revision G (October 2013) to Revision H Page Added Pin Configuration and Functions section, ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information section............................... 1 ChangedOperating junction temperatur row toMaximum junction temperatur, and updated the MIN and MAX values to Internally limited...................................................................................................................................................... 4 2 Submit Documentation Feedback Copyright 20082017, Texas Instruments Incorporated Product Folder Links: TPS23754 TPS23754-1 TPS23756