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TPS23755 フォトカプラなしのフライバック DC/DC コントローラ搭載 IEEE 802.3at PoE PD (Rev. B 翻訳版)
JAJSGY5B
December 2018 – November 2020
TPS23755
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TPS23755 フォトカプラなしのフライバック DC/DC コントローラ搭載 IEEE 802.3at PoE PD (Rev. B 翻訳版)
1
特長
2
アプリケーション
3
概要
4
Revision History
5
Pin Configuration and Functions
6
Specifications
6.1
Absolute Maximum Ratings
6.2
ESD Ratings
6.3
Recommended Operating Conditions
6.4
Thermal Information
6.5
Electrical Characteristics: DC-DC Controller Section
6.6
Electrical Characteristics: PoE and Control
6.7
Typical Characteristics
7
Detailed Description
7.1
Overview
7.2
Functional Block Diagram
7.3
Feature Description
7.3.1
CLS Classification
7.3.2
DEN Detection and Enable
7.3.3
Internal Pass MOSFET
7.3.4
DC-DC Controller Features
7.3.4.1
VCC, VB and Advanced PWM Startup
7.3.4.2
CS, Current Slope Compensation and Blanking
7.3.4.3
COMP, FB, CP and Opto-less Feedback
7.3.4.4
FRS Frequency Setting and Synchronization
7.3.4.5
Frequency Dithering for Spread Spectrum Applications
7.3.4.6
SST and Soft-Start of the Switcher
7.3.4.7
AUX_V, AUX_D and Secondary Adapter Or'ing
7.3.5
Internal Switching FET - DRAIN, RSNS, SRF and SRR
7.3.6
VPD Supply Voltage
7.3.7
VDD Supply Voltage
7.3.8
GND
7.3.9
VSS
7.3.10
Exposed Thermal PAD
7.4
Device Functional Modes
7.4.1
PoE Overview
7.4.2
Threshold Voltages
7.4.3
PoE Start-Up Sequence
7.4.4
Detection
7.4.5
Hardware Classification
7.4.6
Maintain Power Signature (MPS)
7.4.7
Start-Up and Converter Operation
7.4.8
PD Self-Protection
7.4.9
Adapter ORing
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
Bulk Capacitance, CBULK
8.2.2.7
Output Voltage Feedback Divider, RAUX, R1,R2
8.2.2.8
Setting Frequency, RFRS
8.2.2.9
Frequency Dithering, RDTR and CDTR
8.2.2.10
Bias Voltage, CVB and DVB
8.2.2.11
Transformer design, T1
8.2.2.12
Current Sense Resistor, RCS
8.2.2.13
Current Slope Compensation, RS
8.2.2.14
Bias Supply Requirements, CCC, DCC
8.2.2.15
Switching Transformer Considerations, RVCC and CCC2
8.2.2.16
Primary FET Clamping, RCL, CCL, and DCL
8.2.2.17
Converter Output Capacitance, COUT
8.2.2.18
Secondary Output Diode Rectifier, DOUT
8.2.2.19
Slew rate control, RSRF and RSRR
8.2.2.20
Shutdown at Low Temperatures, DVDD and CVDD
8.2.3
Application Curves
9
Power Supply Recommendations
10
Layout
10.1
Layout Guidelines
10.2
Layout Example
11
Device and Documentation Support
11.1
Related documentation
11.2
サポート・リソース
11.3
Trademarks
11.4
静電気放電に関する注意事項
11.5
用語集
12
Mechanical, Packaging, and Orderable Information
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