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TPS2378
ZHCS791C –MARCH 2012–REVISED JULY 2015
www.ti.com.cn
Copyright © 2012–2015, Texas Instruments Incorporated
目目录录
1 特特性性.......................................................................... 1
2 应应用用.......................................................................... 1
3 说说明明.......................................................................... 1
4 修修订订历历史史记记录录 ........................................................... 2
5 Pin Configuration and Functions......................... 3
6 Specifications......................................................... 4
6.1 Absolute Maximum Ratings ...................................... 4
6.2 ESD Ratings.............................................................. 4
6.3 Recommended Operating Conditions....................... 4
6.4 Thermal Information.................................................. 5
6.5 Electrical Characteristics........................................... 5
6.6 Typical Characteristics.............................................. 7
7 Detailed Description............................................ 10
7.1 Overview ................................................................. 10
7.2 Functional Block Diagram ....................................... 10
7.3 Feature Description................................................. 10
7.4 Device Functional Modes........................................ 13
8 Application and Implementation ........................ 21
8.1 Application Information............................................ 21
8.2 Typical Application .................................................. 21
9 Power Supply Recommendations...................... 24
10 Layout................................................................... 24
10.1 Layout Guidelines ................................................. 24
10.2 Layout Example .................................................... 24
10.3 EMI Containment .................................................. 25
10.4 Thermal Considerations and OTSD...................... 25
10.5 ESD....................................................................... 25
11 器器件件和和文文档档支支持持 ..................................................... 26
11.1 文档支持................................................................ 26
11.2 社区资源................................................................ 26
11.3 商标 ....................................................................... 26
11.4 静电放电警告......................................................... 26
11.5 Glossary................................................................ 26
12 机机械械、、封封装装和和可可订订购购信信息息....................................... 26
4 修修订订历历史史记记录录
注：之前版本的页码可能与当前版本有所不同。
Changes from Revision B (November 2012) to Revision C Page
• 已添加 ESD
额定值
表，
特性 描述
部分，
器件功能模式
，
应用和实施
部分，
电源相关建议
部分，
布局
部分，
器件和文
档支持
部分以及
机械、封装和可订购信息
部分........................................................................................................................ 1
• Deleted Detailed Pin Description section. ........................................................................................................................... 15
• Deleted CBD Pin Interface section....................................................................................................................................... 22
• Deleted APD Pin Divider Network, R
APD1
, R
APD2
section...................................................................................................... 22
Changes from Revision A (March 2012) to Revision B Page
• 已增加应用：强制型、四对、高功率设备 (SLVA625) ............................................................................................................ 1
• Added Note 1 to the ELECTRICAL CHARACTERISTICS table ............................................................................................ 6
• Added section: Forced, Four-Pair, High Power PoE ........................................................................................................... 13
• 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 ............................................................................................................ 14
• Changed Table 2, PSE Output Power for 802.3at (Type 2) From: 36W to 30W ................................................................. 14
• Changed text in the Detection section From: "( ΔV / ΔI ) between 23.75 k Ω and 26.25 kΩ at the PI. " To: "( ΔV / ΔI )
between 23.7 kΩ and 26.3 kΩ at the PI." ............................................................................................................................ 16
• 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."................................................... 17
• 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%."................................................................................................ 22
Changes from Original (March 2012) to Revision A Page
• Changed the Inrush termination MAX value From: 100% To: 99% ....................................................................................... 5
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