Datasheet

TPS2378
SLVSB99B –MARCH 2012–REVISED NOVEMBER 2013 www.ti.com
Forced, Four-Pair, High Power PoE
TPS2378 can be arranged in a dual fashion to support high power, four pair operation at 51 W at the input RJ45
connector. Additional information is available in the Dual TPS2378 PD for 51 W High Power-Four Pair PoE
(SLVA625) application report.
ESD
ESD requirements for a unit that incorporates the TPS2378 have a much broader scope and operational
implications than are used in TI’s testing. Unit-level requirements should not be confused with reference design
testing that only validates the ruggedness of the TPS2378.
Layout
Printed circuit board layout recommendations are provided in the evaluation module (EVM) documentation
available for this device.
REVISION HISTORY
Changes from Original (March 2012) to Revision A Page
• Changed the Inrush termination MAX value From: 100% To: 99% ...................................................................................... 3
Changes from Revision A (March 2012) to Revision B Page
• Added Application: Forced, Four-Pair, High Power Devices (SLVA625) ............................................................................. 1
• Added Note 1 to the ELECTRICAL CHARACTERISTICS table ........................................................................................... 4
• Changed Table 1, MINIMUM POWER AT PD (W) Class 4 From: 12.95 To 13. .................................................................. 5
• Changed Table 2, From: POWER ≤ 12.95W To: POWER ≤ 13W, From: POWER > 12.95W To POWER > 13W, and
PD INPUT POWER (max) From: 12.95 W To 13W ........................................................................................................... 11
• Changed Table 2, PSE Output Power for 802.3at (Type 2) From: 36W to 30W ............................................................... 11
• Changed text in the Detection section From: "( ΔV / ΔI ) between 23.75 kΩ and 26.25 kΩ at the PI." To: "( ΔV / ΔI )
between 23.7 kΩ and 26.3 kΩ at the PI." ........................................................................................................................... 12
• Added text to the Startup and Converter Operation section: "Additional loading applied between V
VDD
and V
RTN
during the inrush state may prevent successful PD and subsequent converter start up." ................................................. 14
• Changed text in the Detection Resistor, R
DEN
section From: "R
DEN
between 23.75 kΩ and 26.25 kΩ, or 25 kΩ ± 5%.
" To: "R
DEN
between 23.7 kΩ and 26.3 kΩ, or 25 kΩ ± 5%." .............................................................................................. 18
• Added section: Forced, Four-Pair, High Power PoE .......................................................................................................... 20
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