ZHCSMU0D July 2009 – December 2020 TPS23753A
PRODUCTION DATA
- 1 特性
- 2 应用
- 3 说明
- 4 Revision History
- 5 Product Information
- 6 Pin Configuration and Functions
- 7 Specifications
-
8 Detailed Description
- 8.1 Overview
- 8.2 Functional Block Diagram
- 8.3 Feature Description
- 8.4
Device Functional Modes
- 8.4.1 Threshold Voltages
- 8.4.2 PoE Start-Up Sequence
- 8.4.3 Detection
- 8.4.4 Hardware Classification
- 8.4.5 Maintain Power Signature (MPS)
- 8.4.6 TPS23753A Operation
- 8.4.7 Special Switching MOSFET Considerations
- 8.4.8 Thermal Considerations
- 8.4.9 FRS and Synchronization
- 8.4.10 Blanking – RBLNK
- 8.4.11 Current Slope Compensation
- 8.4.12 Adapter ORing
- 8.4.13 Protection
- 8.4.14 Frequency Dithering for Conducted Emissions Control
- 9 Application and Implementation
- 10Power Supply Recommendations
- 11Layout
- 12Device and Documentation Support
- 13Mechanical, Packaging, and Orderable Information
8.3.1.2 BLNK
Blanking provides an interval between the gate drive going high and the current comparator on CS actively monitoring the input. This delay allows the normal turnon current transient (spike) to subside before the comparator is active, preventing undesired short duty cycles and premature current limiting.
Connect BLNK to RTN to obtain the internally set blanking period. Connect a resistor from BLNK to RTN for a programmable blanking period. The relationship between the desired blanking period and the programming resistor is defined by Equation 3.
Equation 3. 
Place the resistor adjacent to the BLNK pin when it is used.