ZHCSOF9B april 2022 – june 2023 TPS25981
PRODUCTION DATA
- 1
- 1 特性
- 2 应用
- 3 说明
- 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
- 8.3.1 Undervoltage Lockout (UVLO and UVP)
- 8.3.2 Overvoltage Lockout (OVLO)
- 8.3.3 Inrush Current, Overcurrent, and Short-Circuit Protection
- 8.3.4 Analog Load Current Monitor
- 8.3.5 Overtemperature Protection (OTP)
- 8.3.6 Fault Response and Indication (FLT)
- 8.3.7 Power Good Indication (PG)
- 8.3.8 Quick Output Discharge (QOD)
- 8.3.9 Reverse Current Blocking FET Driver
- 8.4 Device Functional Modes
- 9 Application and Implementation
- 10Power Supply Recommendations
- 11Layout
- 12Device and Documentation Support
- 13Mechanical, Packaging, and Orderable Information
8.3.2 Overvoltage Lockout (OVLO)
The TPS259814x devices allow the user to implement overvoltage lockout to protect the load from input overvoltage conditions. The OVLO comparator on the EN/OVLO pin allows the overvoltage protection threshold to be adjusted to a user defined value. After the voltage at the EN/OVLO pin crosses the OVLO rising threshold VOV(R), the device turns off the power to the output. Thereafter, the devices wait for the voltage at the EN/OVLO pin to fall below the OVLO falling threshold VOV(F) before the output power is turned ON again. The rising and falling thresholds are slightly different to provide hysteresis. Figure 9-10 and Equation 2 show how a resistor divider can be used to set the OVLO set point for a given voltage supply.
Figure 8-2 Adjustable Overvoltage
Protection
Figure 8-3 TPS259814x Overvoltage Lockout
and Recovery