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TPS23754

TPS23754-1

TPS23756

SLVS885G –OCTOBER 2008–REVISED OCTOBER 2013

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REVISION HISTORY

Changes from Revision A (April 2009) to Revision B Page

• Deleted The TPS23756 is at PREVIEW status. ................................................................................................................... 1

• Changed Preview .................................................................................................................................................................. 2

• Changed minimum limit ........................................................................................................................................................ 3

• Changed limits ...................................................................................................................................................................... 3

• Added graph for 756 ........................................................................................................................................................... 12

• Added graph for '756 .......................................................................................................................................................... 13

Changes from Revision B (May 2009) to Revision C Page

• Changed the ESDS statement. ............................................................................................................................................. 2

Changes from Revision C (September 2009) to Revision D Page

• Changed From: IEEE 802.3at (Draft) To: IEEE 802.3at throughout the data sheet ............................................................ 1

• Changed the Thermal resistance note in the DISSIPATIONS RATINGS table to include addional information ................. 3

• Changed Table 1 - Notes for the Class 4 row ...................................................................................................................... 9

• Changed text in the PoE OVERVIEW section From: The PD may return the default 12.95W (often referred to as

13W) current-encoded class To: The PD may return the default, 13W current-encoded class ......................................... 17

• Changed Table 2 - Standard column .................................................................................................................................. 18

• Changed text in the Hardware Classification section From: A type 1 PSE will treat a class 4 device like a class 0

device, allotting 12.95 W if it chooses to power the PD To: A type 1 PSE will treat a class 4 device like a class 0

device, allotting 13W if it chooses to power the PD ........................................................................................................... 19

• Added Using DEN to Disable PoE ...................................................................................................................................... 25

Changes from Revision D (December 2009) to Revision E Page

• Changed Table 2 - PSE Output Power, 802.3at(Type 2) From: 36 W To: 3 0W. .............................................................. 18

• Changed Figure 23, label 10 mA/div To: 10 V/div .............................................................................................................. 19

Changes from Revision E (April 2012) to Revision F Page

• Changed the application report From: SLAU303 To: SLAU535 ......................................................................................... 26

Changes from Revision F (June 2012) to Revision G Page

• Changed class 0, 3, and 4 max and min values for power at PD. ....................................................................................... 9

• Updated the equations for R

PPD1

and V

ADPTR_OFF

to have an addition rather than a subtraction in the denominator

and the last operation depicted, respectively. .................................................................................................................... 10

• Changed static PD input voltage range and PD input power max. .................................................................................... 18

• Changed the values that the incremental resistance is between for: a valid PD detection signature is an incremental

resistance ( ΔV / ΔI ) between 23.7 kΩ and 26.3 kΩ at the PI. .......................................................................................... 19

• Changed valid MPS to be a minimum DC current of 10 mA (or 10-mA pulsed current for at least 75 ms every 325

ms) and an AC impedance lower than 26.3 kΩ in parallel with 0.05 μF. ........................................................................... 21

• Added a sentence: Additional loading applied between V

VDD

and V

RTN

during the inrush state may prevent

successful PD and subsequent converter start-up. ............................................................................................................ 21

• Changed the value range for the detection signature resistance. ...................................................................................... 27