ZHCSQ77B February 2023 – June 2024 TPS25948
PRODUCTION DATA
- 1
- 1 特性
- 2 應用
- 3 說明
- 4 Device Comparison Table
- 5 Pin Configuration and Functions
- 6 Specifications
-
7 Detailed Description
- 7.1 Overview
- 7.2 Functional Block Diagram
- 7.3
Feature Description
- 7.3.1 Undervoltage Lockout (UVLO and UVP)
- 7.3.2 Overvoltage Lockout (OVLO)
- 7.3.3 Inrush Current, Overcurrent, and Short Circuit Protection
- 7.3.4 Analog Load Current Monitor
- 7.3.5 Reverse Current Protection
- 7.3.6 Overtemperature Protection (OTP)
- 7.3.7 Fault Response and Indication (FLT)
- 7.3.8 Supply Good Indication (SPLYGD/SPLYGD)
- 7.4 Device Functional Modes
- 8 Application and Implementation
- 9 Device and Documentation Support
- 10Revision History
- 11Mechanical, Packaging, and Orderable Information
7.3.2 Overvoltage Lockout (OVLO)
The TPS25948xx allows the user to implement Overvoltage protection on the bus to shield the system against supply overvoltage conditions. The internal fast comparator on the OVLO pin allows the Overvoltage Lockout threshold to be adjusted to a user defined value. Once the voltage at the OVLO pin crosses the OVLO rising threshold VOV(R), the device turns off both the FETs to cut off the power path. Thereafter, the devices wait for the voltage at the OVLO pin to fall below the OVLO falling threshold VOV(F) before the FETs are turned ON again. The rising and falling thresholds are slightly different to provide hysterisis. Figure 7-5 and Equation 2 show how a resistor divider can be used to set the OVLO set point for a given voltage supply.
Figure 7-5 Adjustable Overvoltage Protection
Figure 7-6 TPS25948xx Overvoltage Lockout and Recovery