ZHCSIQ0F August 2018 – August 2020 TPS2120 , TPS2121
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 Parameter Measurement Information
-
9 Detailed Description
- 9.1 Overview
- 9.2 Functional Block Diagram
- 9.3
Feature Description
- 9.3.1 Input Settling Time and Output Soft Start Control (SS)
- 9.3.2 Active Current Limiting (ILM)
- 9.3.3 Short-Circuit Protection
- 9.3.4 Thermal Protection (TSD)
- 9.3.5 Overvoltage Protection (OVx)
- 9.3.6 Fast Reverse Current Blocking (RCB)
- 9.3.7 Output Voltage Dip and Fast Switchover Control (TPS2121 only)
- 9.3.8 Input Voltage Comparator (VCOMP)
- 9.4 TPS2120 Device Functional Modes
- 9.5 TPS2121 Device Functional Modes
- 10Application and Implementation
- 11Power Supply Recommendations
- 12Layout
- 13Device and Documentation Support
- 14Mechanical, Packaging, and Orderable Information
10.2.4.2 Selecting OVx Resistors
Independent output overvoltage protection is available for both IN1 and IN2. The VREF comparator on the OV1 and OV2 pins allows for the overvoltage protection thresholds to be adjusted independently, allowing for different overvoltage thresholds on each channel. When overvoltage is engaged, the corresponding channel will turn off immediately if the pin reaches VREF, 1.06 V (typical). On this design, the overvoltage thresholds are triggered at roughly 1-V higher than the nominal input voltages. On IN1, the overvoltage resistor divider was programmed to be 6.08 V, where as the divider on IN2 was programmed to be 3.96 V. The OV resistor calculations are shown in Equation 6 and Equation 7.
