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TPS23754PWP Datasheet(PDF) 1 Page - Texas Instruments |
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TPS23754PWP Datasheet(HTML) 1 Page - Texas Instruments |
1 / 41 page M1 C OUT D VC1 GATE V C CS CTL V B V SS C IN R CTL C CTL CLS DEN FRS T2P R T2P-OUT Type2PSE Indicator V B TLV431 R OB C IZ V OUT PAD GAT2 M2 D CL C CL C C M4 M3 R T2P D A R APD1 N/CORPPD APD R DT L OUT L VC T1 C IO D VC2 Optional Interface V T2P-OUT TPS23754 TPS23754-1 TPS23756 www.ti.com SLVS885D – OCTOBER 2008 – REVISED DECEMBER 2009 High Power/High Efficiency PoE Interface and DC/DC Controller 1 FEATURES The TPS23754/6 supports a number of input voltage 2 • Powers up to 30 W (input) PDs ORing options including highest voltage, external • DC/DC Control Optimized for Isolated adapter preference, and PoE preference. These Converters features allow the designer to determine which power • Supports High-efficiency Topologies source will carry the load under all conditions. • Complete PoE Interface The PoE interface features the new extended • Enhanced Classification per IEEE 802.3at with hardware classification necessary for compatibility Status Flag with high-power midspan power sourcing equipment (PSE) per IEEE 802.3at. The detection signature pin • Adapter ORing Support can also be used to force power from the PoE source • Programmable Frequency with off. Classification can be programmed to any of the Synchronization defined types with a single resistor. • Robust 100 V, 0.5 Ω Hotswap MOSFET The dc/dc controller features two complementary gate • –40°C to 125°C Junction Temperature Range drivers with programmable dead time. This simplifies design of active-clamp forward converters or • Industry Standard PowerPAD™ TSSOP-20 optimized gate drive for highly-efficient flyback topologies. The second gate driver may be disabled if APPLICATIONS desired for single MOSFET topologies. The controller • IEEE 802.3at Compliant Devices also features internal softstart, bootstrap startup • Video and VoIP Telephones source, current-mode compensation, and a 78% • RFID Readers maximum duty cycle. A programmable and synchronizable oscillator allows design optimization • Multiband Access Points for efficiency and eases use of the controller to • Security Cameras upgrade existing power supply designs. Accurate programmable blanking, with a default period, DESCRIPTION simplifies the usual current-sense filter design trade-offs. The TPS23754/6 is a combined Power over Ethernet (PoE) powered device (PD) interface and The TPS23754 has a 15 V converter startup while the current-mode dc/dc controller optimized specifically TPS23756 has a 9 V converter startup. The for isolated converters. The PoE interface supports TPS23754-1 replaces the PPD pin with a no-connect the IEEE 802.3at standard. for increased pin spacing. Figure 1. High Efficiency Converter Using TPS23754 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 2 PowerPAD is a trademark of Texas Instruments. PRODUCTION DATA information is current as of publication date. Copyright © 2008–2009, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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