ZHCSGZ0B October 2017 – November 2017 TPS23525
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 Input Cap, Input TVS, and OR-ing FET selection
- 9.2.2.7 EMI Filter Consideration
- 9.2.2.8 Under Voltage and Over Voltage Settings
- 9.2.2.9 Choosing RVCC and CVCC
- 9.2.2.10 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
9.2.2.3 Selecting VDS Switch Over Threshold
The VDS threshold where the current limit switches from CL1 to CL2 can be programmed using RD. In general a higher threshold improves ability to ride through voltage steps, brown outs, and other transients. However, a larger setting can also expose the MOSFET to more stress, because the larger current limit is now allowed at higher VDS voltages. If there are no specific voltage step requirements, 20 V is a good starting point. Use the equation below to compute the target RD.
Equation 15. 