ZHCSL90 August 2020 TPS25980
PRODUCTION DATA
- 1 特性
- 2 應用
- 3 說明
- 4 Revision History
- 5 Device Comparison Table
- 6 Pin Configuration and Functions
- 7 Specifications
-
8 Detailed Description
- 8.1 Overview
- 8.2 Functional Block Diagram
- 8.3 Feature Description
- 8.4 Fault Response
- 8.5 Device Functional Modes
-
9 Application and Implementation
- 9.1 Application Information
- 9.2
Typical Application: Patient Monitoring System in Medical Applications
- 9.2.1 Design Requirements
- 9.2.2
Detailed Design Procedure
- 9.2.2.1 Device Selection
- 9.2.2.2 Setting the Current Limit Threshold: RILIM Selection
- 9.2.2.3 Setting the Undervoltage Lockout Set Point
- 9.2.2.4 Choosing the Current Monitoring Resistor: RIMON
- 9.2.2.5 Setting the Output Voltage Ramp Time (TdVdt)
- 9.2.2.6 Setting the Load Handshake (LDSTRT) Delay
- 9.2.2.7 Setting the Transient Overcurrent Blanking Interval (tITIMER)
- 9.2.2.8 Setting the Auto-Retry Delay and Number of Retries
- 9.2.3 Application Curves
- 9.3 System Examples
- 10Power Supply Recommendations
- 11Layout
- 12Device and Documentation Support
- 13Mechanical, Packaging, and Orderable Information
8.3.2 Overvoltage Protection (OVP)
The TPS25980x implements Overvoltage Lock-Out (OVLO) on IN to protect the output load in the event of input overvoltage. When the input exceeds the Overvoltage Protection threshold (VOVP(R)) the device turns off the output within tOVP. As long as an overvoltage condition is present on the input, the device stays disabled and the output will be turned off. Once the input voltage returns to the normal operating range, the device attempts to start up normally.
Figure 8-2 Overvoltage ResponseThere are multiple device options with different fixed overvoltage thresholds to choose from, including one without internal overvoltage protection. See the Device Comparison Table for a list of available options.