ZHCSHW5A September 2017 – December 2017 TPS23521
PRODUCTION DATA.
- 1 特性
- 2 应用
- 3 说明
- 4 修订历史记录
- 5 Pin Configuration and Functions
- 6 Specifications
- 7 Parameter Measurement Information
- 8 Detailed Description
-
9 Application and Implementation
- 9.1 Application Information
- 9.2
Typical Application
- 9.2.1 Design Requirements
- 9.2.2
Detailed Design Procedure
- 9.2.2.1 Selecting RSNS
- 9.2.2.2 Selecting Soft Start Setting: CSS and CSS,VEE
- 9.2.2.3 Selecting VDS Switch Over Threshold
- 9.2.2.4 Timer Selection
- 9.2.2.5 MOSFET Selection and SOA Checks
- 9.2.2.6 EMI Filter Consideration
- 9.2.2.7 Under Voltage and Over Voltage Settings
- 9.2.2.8 Choosing RVCC and CVCC
- 9.2.2.9 Power Good Interface to Downstream DC/DC
- 9.2.3 Application Curves
- 10Power Supply Recommendations
- 11Layout
- 12器件和文档支持
- 13机械、封装和可订购信息
9.2.2.1 Selecting RSNS
Before selecting RSNS, first compute the maximum load current. For this example the worst case load current happens at the minimum input voltage of 36 V. Thus the maximum current is 1200 W/36 V = 33.3 A. To provide some margin, set the target current limit to 36.6 A (10% higher). Set VSNS,CL1 to 40mV by tying the PROG pin to VEE and compute RSNS using equation below:
Equation 11. 
Use next available RSNS of 1 mΩ.