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TPS23754PWPR Datasheet(PDF) 13 Page - Texas Instruments |
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TPS23754PWPR Datasheet(HTML) 13 Page - Texas Instruments |
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13 / 48 page  D CLRB Q Oscillator 1 GATE V DD1 Reg V C V B Ref CTL FRS Control enb CONV. OFF + - 4ms Softstart 0.55V - + - CK 11V& 9V 22V& 21.25V 35V& 30.5V Class Logic& Regulator V DD 50mW 1 0 S R Q 12.5V &1V ILIM H L V SS Common Circuitsand PoE Thermal Monitor RTN CLS APD V SS DEN + - 400ms EN 2.5V CONV. OFF 4V 1.5V &1.2V ARTN + 0.75V PPD GAT2 DT COM ARTN T2P ARTN pa sa 1.55V &1.25V ARTN Converter Thermal Monitor f f ss t2 T2 State Eng. t2 5V &4V pa,sa,den CTL f GlobalCvtr. Enable 50kW 50kW BLNK ARTN CS 40mA (pk) 3.75kW enb Hotswap MOSFET Switch Matrix fpd 7.8V den uvlo uvlo, fpd uvlo 13 TPS23754, TPS23754-1, TPS23756 www.ti.com SLVS885I – OCTOBER 2008 – REVISED DECEMBER 2017 Product Folder Links: TPS23754 TPS23754-1 TPS23756 Submit Documentation Feedback Copyright © 2008–2017, Texas Instruments Incorporated 7 Detailed Description 7.1 Overview The TPS23754 and TPS23756 devices have a PoE that contains all of the features needed to implement an IEEE802.3at type-2 powered device (PD) such as Detection, Classification, Type 2 Hardware Classification, and 140-mA inrush current limit during start-up. It combines a current mode DC-DC controller optimized specifically for isolated converters. The TPS23754 and TPS23756 devices integrate a low 0.5-Ω internal switch to allow for up to 0.85 A of continuous current through the PD during normal operation. The TPS23754 and TPS23756 devices contain several protection features such as thermal shutdown, current limit foldback, and a robust 100-V internal switch. 7.2 Functional Block Diagram 7.3 Feature Description See Figure 27 for component reference designators (RCS for example), and the Electrical Characteristics for values denoted by reference (VCSMAX for example). Electrical characteristic values take precedence over any numerical values used in the following sections. |
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