ZHCSA47E
July 2012 – January 2018
TPS23751
,
TPS23752
PRODUCTION DATA.
1
特性
2
应用
3
说明
Device Images
3.1
典型应用电路
4
修订历史记录
5
Pin Configuration and Functions
Pin Functions
6
Specifications
6.1
Absolute Maximum Ratings
6.2
ESD Ratings
6.3
ESD Ratings: Surge
6.4
Recommended Operating Conditions
6.5
Thermal Information
6.6
Electric Characteristics - Controller Section
6.7
Electrical Characteristics - Sleep Mode (TPS23752 Only)
6.8
Electrical Characteristics - PoE Interface Section
6.9
Typical Characteristics
7
Detailed Description
7.1
Overview
7.2
Functional Block Diagrams
7.3
Feature Description
7.3.1
Pin Description
7.4
Device Functional Modes
7.4.1
PoE Overview
7.4.1.1
Threshold Voltages
7.4.1.2
PoE Startup Sequence
7.4.1.3
Detection
7.4.1.4
Hardware Classification
7.4.1.5
Inrush and Startup
7.4.1.6
Maintain Power Signature
7.4.1.7
Startup and Converter Operation
7.4.1.8
PD Hotswap Operation
7.4.2
Sleep Mode Operation (TPS23752 only)
7.4.2.1
Converter Controller Features
7.4.2.2
PWM and VFO Operation; CTL, SRT, and SRD Pin Relationships to Output Load Current
7.4.2.3
Bootstrap Topology
7.4.2.4
Current Slope Compensation and Current Limit
7.4.2.5
RT
7.4.2.6
T2P, Startup and Power Management
7.4.2.7
Thermal Shutdown
7.4.2.8
Adapter ORing
7.4.2.9
Using DEN to Disable PoE
7.4.2.10
ORing Challenges
8
Application and Implementation
8.1
Application Information
8.2
Typical Application
8.2.1
Design Requirements
8.2.2
Detailed Design Procedure
8.2.2.1
Input Bridges and Schottky Diodes
8.2.2.2
Protection, D1
8.2.2.3
Capacitor, C1
8.2.2.4
Detection Resistor, RDEN
8.2.2.5
Classification Resistor, RCLS
8.2.2.6
APD Pin Divider Network, RAPD1, RAPD2
8.2.2.7
Setting the PWM-VFO Threshold using the SRT pin
8.2.2.8
Setting Frequency (RT)
8.2.2.9
Current Slope Compensation
8.2.2.10
Voltage Feed-Forward Compensation
8.2.2.11
Estimating Bias Supply Requirements and Cvc
8.2.2.12
Switching Transformer Considerations and RVC
8.2.2.13
T2P Pin Interface
8.2.2.14
Softstart
8.2.2.15
Special Switching MOSFET Considerations
8.2.2.16
ESD
8.2.2.17
Thermal Considerations and OTSD
8.2.3
Application Curves
9
Power Supply Recommendations
10
Layout
10.1
Layout Guidelines
10.2
Layout Example
11
器件和文档支持
11.1
文档支持
11.1.1
相关文档
11.1.2
相关链接
11.2
社区资源
11.3
商标
11.4
静电放电警告
11.5
Glossary
12
机械、封装和可订购信息
封装选项
机械数据 (封装 | 引脚)
PWP|20
MHTS001G
散热焊盘机械数据 (封装 | 引脚)
PWP|20
PPTD312C
订购信息
zhcsa47e_oa
zhcsa47e_pm
10.2
Layout Example
Figure 38.
TPS23751EVM-104 EVM Parts Placement and Example Layout